React Hooks and Component Lifecycle Equivalent












6














What are the equivalents of the componentDidMount, componentDidUpdate, and componentWillUnmount lifecycle hooks using React hooks like useEffect?










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    6














    What are the equivalents of the componentDidMount, componentDidUpdate, and componentWillUnmount lifecycle hooks using React hooks like useEffect?










    share|improve this question

























      6












      6








      6


      3





      What are the equivalents of the componentDidMount, componentDidUpdate, and componentWillUnmount lifecycle hooks using React hooks like useEffect?










      share|improve this question













      What are the equivalents of the componentDidMount, componentDidUpdate, and componentWillUnmount lifecycle hooks using React hooks like useEffect?







      javascript reactjs react-hooks






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      asked Nov 11 at 22:49









      Yangshun Tay

      8,83153667




      8,83153667
























          1 Answer
          1






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          8














          componentDidMount



          Pass an empty array as the second argument to useEffect() to run only the callback on mount only.






          function ComponentDidMount() {
          const [count, setCount] = React.useState(0);
          React.useEffect(() => {
          console.log('componentDidMount');
          }, );

          return (
          <div>
          <p>componentDidMount: {count} times</p>
          <button
          onClick={() => {
          setCount(count + 1);
          }}
          >
          Click Me
          </button>
          </div>
          );
          }

          ReactDOM.render(
          <div>
          <ComponentDidMount />
          </div>,
          document.querySelector("#app")
          );

          <script src="https://unpkg.com/react@16.7.0-alpha.0/umd/react.development.js"></script>
          <script src="https://unpkg.com/react-dom@16.7.0-alpha.0/umd/react-dom.development.js"></script>

          <div id="app"></div>





          componentDidUpdate



          componentDidUpdate() is invoked immediately after updating occurs. This method is not called for the initial render. useEffect runs on every render including the first. So if you want to have a strict equivalent as componentDidUpdate, you have to use useRef to determine if the component has been mounted once. If you want to be even stricter, use useLayoutEffect(), but it fires synchronously. In most cases, useEffect() should be sufficient.



          This answer is inspired by Tholle, all credit goes to him.






          function ComponentDidUpdate() {
          const [count, setCount] = React.useState(0);

          const isFirstUpdate = React.useRef(true);
          React.useEffect(() => {
          if (isFirstUpdate.current) {
          isFirstUpdate.current = false;
          return;
          }

          console.log('componentDidUpdate');
          });

          return (
          <div>
          <p>componentDidUpdate: {count} times</p>
          <button
          onClick={() => {
          setCount(count + 1);
          }}
          >
          Click Me
          </button>
          </div>
          );
          }

          ReactDOM.render(
          <ComponentDidUpdate />,
          document.getElementById("app")
          );

          <script src="https://unpkg.com/react@16.7.0-alpha.0/umd/react.development.js"></script>
          <script src="https://unpkg.com/react-dom@16.7.0-alpha.0/umd/react-dom.development.js"></script>

          <div id="app"></div>





          componentWillUnmount



          Return a callback in useEffect's callback argument and it will be called before unmounting.






          function ComponentWillUnmount() {
          function ComponentWillUnmountInner(props) {
          React.useEffect(() => {
          return () => {
          console.log('componentWillUnmount');
          };
          }, );

          return (
          <div>
          <p>componentWillUnmount</p>
          </div>
          );
          }

          const [count, setCount] = React.useState(0);

          return (
          <div>
          {count % 2 === 0 ? (
          <ComponentWillUnmountInner count={count} />
          ) : (
          <p>No component</p>
          )}
          <button
          onClick={() => {
          setCount(count + 1);
          }}
          >
          Click Me
          </button>
          </div>
          );
          }

          ReactDOM.render(
          <div>
          <ComponentWillUnmount />
          </div>,
          document.querySelector("#app")
          );

          <script src="https://unpkg.com/react@16.7.0-alpha.0/umd/react.development.js"></script>
          <script src="https://unpkg.com/react-dom@16.7.0-alpha.0/umd/react-dom.development.js"></script>

          <div id="app"></div>








          share|improve this answer























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            1 Answer
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            1 Answer
            1






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            8














            componentDidMount



            Pass an empty array as the second argument to useEffect() to run only the callback on mount only.






            function ComponentDidMount() {
            const [count, setCount] = React.useState(0);
            React.useEffect(() => {
            console.log('componentDidMount');
            }, );

            return (
            <div>
            <p>componentDidMount: {count} times</p>
            <button
            onClick={() => {
            setCount(count + 1);
            }}
            >
            Click Me
            </button>
            </div>
            );
            }

            ReactDOM.render(
            <div>
            <ComponentDidMount />
            </div>,
            document.querySelector("#app")
            );

            <script src="https://unpkg.com/react@16.7.0-alpha.0/umd/react.development.js"></script>
            <script src="https://unpkg.com/react-dom@16.7.0-alpha.0/umd/react-dom.development.js"></script>

            <div id="app"></div>





            componentDidUpdate



            componentDidUpdate() is invoked immediately after updating occurs. This method is not called for the initial render. useEffect runs on every render including the first. So if you want to have a strict equivalent as componentDidUpdate, you have to use useRef to determine if the component has been mounted once. If you want to be even stricter, use useLayoutEffect(), but it fires synchronously. In most cases, useEffect() should be sufficient.



            This answer is inspired by Tholle, all credit goes to him.






            function ComponentDidUpdate() {
            const [count, setCount] = React.useState(0);

            const isFirstUpdate = React.useRef(true);
            React.useEffect(() => {
            if (isFirstUpdate.current) {
            isFirstUpdate.current = false;
            return;
            }

            console.log('componentDidUpdate');
            });

            return (
            <div>
            <p>componentDidUpdate: {count} times</p>
            <button
            onClick={() => {
            setCount(count + 1);
            }}
            >
            Click Me
            </button>
            </div>
            );
            }

            ReactDOM.render(
            <ComponentDidUpdate />,
            document.getElementById("app")
            );

            <script src="https://unpkg.com/react@16.7.0-alpha.0/umd/react.development.js"></script>
            <script src="https://unpkg.com/react-dom@16.7.0-alpha.0/umd/react-dom.development.js"></script>

            <div id="app"></div>





            componentWillUnmount



            Return a callback in useEffect's callback argument and it will be called before unmounting.






            function ComponentWillUnmount() {
            function ComponentWillUnmountInner(props) {
            React.useEffect(() => {
            return () => {
            console.log('componentWillUnmount');
            };
            }, );

            return (
            <div>
            <p>componentWillUnmount</p>
            </div>
            );
            }

            const [count, setCount] = React.useState(0);

            return (
            <div>
            {count % 2 === 0 ? (
            <ComponentWillUnmountInner count={count} />
            ) : (
            <p>No component</p>
            )}
            <button
            onClick={() => {
            setCount(count + 1);
            }}
            >
            Click Me
            </button>
            </div>
            );
            }

            ReactDOM.render(
            <div>
            <ComponentWillUnmount />
            </div>,
            document.querySelector("#app")
            );

            <script src="https://unpkg.com/react@16.7.0-alpha.0/umd/react.development.js"></script>
            <script src="https://unpkg.com/react-dom@16.7.0-alpha.0/umd/react-dom.development.js"></script>

            <div id="app"></div>








            share|improve this answer




























              8














              componentDidMount



              Pass an empty array as the second argument to useEffect() to run only the callback on mount only.






              function ComponentDidMount() {
              const [count, setCount] = React.useState(0);
              React.useEffect(() => {
              console.log('componentDidMount');
              }, );

              return (
              <div>
              <p>componentDidMount: {count} times</p>
              <button
              onClick={() => {
              setCount(count + 1);
              }}
              >
              Click Me
              </button>
              </div>
              );
              }

              ReactDOM.render(
              <div>
              <ComponentDidMount />
              </div>,
              document.querySelector("#app")
              );

              <script src="https://unpkg.com/react@16.7.0-alpha.0/umd/react.development.js"></script>
              <script src="https://unpkg.com/react-dom@16.7.0-alpha.0/umd/react-dom.development.js"></script>

              <div id="app"></div>





              componentDidUpdate



              componentDidUpdate() is invoked immediately after updating occurs. This method is not called for the initial render. useEffect runs on every render including the first. So if you want to have a strict equivalent as componentDidUpdate, you have to use useRef to determine if the component has been mounted once. If you want to be even stricter, use useLayoutEffect(), but it fires synchronously. In most cases, useEffect() should be sufficient.



              This answer is inspired by Tholle, all credit goes to him.






              function ComponentDidUpdate() {
              const [count, setCount] = React.useState(0);

              const isFirstUpdate = React.useRef(true);
              React.useEffect(() => {
              if (isFirstUpdate.current) {
              isFirstUpdate.current = false;
              return;
              }

              console.log('componentDidUpdate');
              });

              return (
              <div>
              <p>componentDidUpdate: {count} times</p>
              <button
              onClick={() => {
              setCount(count + 1);
              }}
              >
              Click Me
              </button>
              </div>
              );
              }

              ReactDOM.render(
              <ComponentDidUpdate />,
              document.getElementById("app")
              );

              <script src="https://unpkg.com/react@16.7.0-alpha.0/umd/react.development.js"></script>
              <script src="https://unpkg.com/react-dom@16.7.0-alpha.0/umd/react-dom.development.js"></script>

              <div id="app"></div>





              componentWillUnmount



              Return a callback in useEffect's callback argument and it will be called before unmounting.






              function ComponentWillUnmount() {
              function ComponentWillUnmountInner(props) {
              React.useEffect(() => {
              return () => {
              console.log('componentWillUnmount');
              };
              }, );

              return (
              <div>
              <p>componentWillUnmount</p>
              </div>
              );
              }

              const [count, setCount] = React.useState(0);

              return (
              <div>
              {count % 2 === 0 ? (
              <ComponentWillUnmountInner count={count} />
              ) : (
              <p>No component</p>
              )}
              <button
              onClick={() => {
              setCount(count + 1);
              }}
              >
              Click Me
              </button>
              </div>
              );
              }

              ReactDOM.render(
              <div>
              <ComponentWillUnmount />
              </div>,
              document.querySelector("#app")
              );

              <script src="https://unpkg.com/react@16.7.0-alpha.0/umd/react.development.js"></script>
              <script src="https://unpkg.com/react-dom@16.7.0-alpha.0/umd/react-dom.development.js"></script>

              <div id="app"></div>








              share|improve this answer


























                8












                8








                8






                componentDidMount



                Pass an empty array as the second argument to useEffect() to run only the callback on mount only.






                function ComponentDidMount() {
                const [count, setCount] = React.useState(0);
                React.useEffect(() => {
                console.log('componentDidMount');
                }, );

                return (
                <div>
                <p>componentDidMount: {count} times</p>
                <button
                onClick={() => {
                setCount(count + 1);
                }}
                >
                Click Me
                </button>
                </div>
                );
                }

                ReactDOM.render(
                <div>
                <ComponentDidMount />
                </div>,
                document.querySelector("#app")
                );

                <script src="https://unpkg.com/react@16.7.0-alpha.0/umd/react.development.js"></script>
                <script src="https://unpkg.com/react-dom@16.7.0-alpha.0/umd/react-dom.development.js"></script>

                <div id="app"></div>





                componentDidUpdate



                componentDidUpdate() is invoked immediately after updating occurs. This method is not called for the initial render. useEffect runs on every render including the first. So if you want to have a strict equivalent as componentDidUpdate, you have to use useRef to determine if the component has been mounted once. If you want to be even stricter, use useLayoutEffect(), but it fires synchronously. In most cases, useEffect() should be sufficient.



                This answer is inspired by Tholle, all credit goes to him.






                function ComponentDidUpdate() {
                const [count, setCount] = React.useState(0);

                const isFirstUpdate = React.useRef(true);
                React.useEffect(() => {
                if (isFirstUpdate.current) {
                isFirstUpdate.current = false;
                return;
                }

                console.log('componentDidUpdate');
                });

                return (
                <div>
                <p>componentDidUpdate: {count} times</p>
                <button
                onClick={() => {
                setCount(count + 1);
                }}
                >
                Click Me
                </button>
                </div>
                );
                }

                ReactDOM.render(
                <ComponentDidUpdate />,
                document.getElementById("app")
                );

                <script src="https://unpkg.com/react@16.7.0-alpha.0/umd/react.development.js"></script>
                <script src="https://unpkg.com/react-dom@16.7.0-alpha.0/umd/react-dom.development.js"></script>

                <div id="app"></div>





                componentWillUnmount



                Return a callback in useEffect's callback argument and it will be called before unmounting.






                function ComponentWillUnmount() {
                function ComponentWillUnmountInner(props) {
                React.useEffect(() => {
                return () => {
                console.log('componentWillUnmount');
                };
                }, );

                return (
                <div>
                <p>componentWillUnmount</p>
                </div>
                );
                }

                const [count, setCount] = React.useState(0);

                return (
                <div>
                {count % 2 === 0 ? (
                <ComponentWillUnmountInner count={count} />
                ) : (
                <p>No component</p>
                )}
                <button
                onClick={() => {
                setCount(count + 1);
                }}
                >
                Click Me
                </button>
                </div>
                );
                }

                ReactDOM.render(
                <div>
                <ComponentWillUnmount />
                </div>,
                document.querySelector("#app")
                );

                <script src="https://unpkg.com/react@16.7.0-alpha.0/umd/react.development.js"></script>
                <script src="https://unpkg.com/react-dom@16.7.0-alpha.0/umd/react-dom.development.js"></script>

                <div id="app"></div>








                share|improve this answer














                componentDidMount



                Pass an empty array as the second argument to useEffect() to run only the callback on mount only.






                function ComponentDidMount() {
                const [count, setCount] = React.useState(0);
                React.useEffect(() => {
                console.log('componentDidMount');
                }, );

                return (
                <div>
                <p>componentDidMount: {count} times</p>
                <button
                onClick={() => {
                setCount(count + 1);
                }}
                >
                Click Me
                </button>
                </div>
                );
                }

                ReactDOM.render(
                <div>
                <ComponentDidMount />
                </div>,
                document.querySelector("#app")
                );

                <script src="https://unpkg.com/react@16.7.0-alpha.0/umd/react.development.js"></script>
                <script src="https://unpkg.com/react-dom@16.7.0-alpha.0/umd/react-dom.development.js"></script>

                <div id="app"></div>





                componentDidUpdate



                componentDidUpdate() is invoked immediately after updating occurs. This method is not called for the initial render. useEffect runs on every render including the first. So if you want to have a strict equivalent as componentDidUpdate, you have to use useRef to determine if the component has been mounted once. If you want to be even stricter, use useLayoutEffect(), but it fires synchronously. In most cases, useEffect() should be sufficient.



                This answer is inspired by Tholle, all credit goes to him.






                function ComponentDidUpdate() {
                const [count, setCount] = React.useState(0);

                const isFirstUpdate = React.useRef(true);
                React.useEffect(() => {
                if (isFirstUpdate.current) {
                isFirstUpdate.current = false;
                return;
                }

                console.log('componentDidUpdate');
                });

                return (
                <div>
                <p>componentDidUpdate: {count} times</p>
                <button
                onClick={() => {
                setCount(count + 1);
                }}
                >
                Click Me
                </button>
                </div>
                );
                }

                ReactDOM.render(
                <ComponentDidUpdate />,
                document.getElementById("app")
                );

                <script src="https://unpkg.com/react@16.7.0-alpha.0/umd/react.development.js"></script>
                <script src="https://unpkg.com/react-dom@16.7.0-alpha.0/umd/react-dom.development.js"></script>

                <div id="app"></div>





                componentWillUnmount



                Return a callback in useEffect's callback argument and it will be called before unmounting.






                function ComponentWillUnmount() {
                function ComponentWillUnmountInner(props) {
                React.useEffect(() => {
                return () => {
                console.log('componentWillUnmount');
                };
                }, );

                return (
                <div>
                <p>componentWillUnmount</p>
                </div>
                );
                }

                const [count, setCount] = React.useState(0);

                return (
                <div>
                {count % 2 === 0 ? (
                <ComponentWillUnmountInner count={count} />
                ) : (
                <p>No component</p>
                )}
                <button
                onClick={() => {
                setCount(count + 1);
                }}
                >
                Click Me
                </button>
                </div>
                );
                }

                ReactDOM.render(
                <div>
                <ComponentWillUnmount />
                </div>,
                document.querySelector("#app")
                );

                <script src="https://unpkg.com/react@16.7.0-alpha.0/umd/react.development.js"></script>
                <script src="https://unpkg.com/react-dom@16.7.0-alpha.0/umd/react-dom.development.js"></script>

                <div id="app"></div>








                function ComponentDidMount() {
                const [count, setCount] = React.useState(0);
                React.useEffect(() => {
                console.log('componentDidMount');
                }, );

                return (
                <div>
                <p>componentDidMount: {count} times</p>
                <button
                onClick={() => {
                setCount(count + 1);
                }}
                >
                Click Me
                </button>
                </div>
                );
                }

                ReactDOM.render(
                <div>
                <ComponentDidMount />
                </div>,
                document.querySelector("#app")
                );

                <script src="https://unpkg.com/react@16.7.0-alpha.0/umd/react.development.js"></script>
                <script src="https://unpkg.com/react-dom@16.7.0-alpha.0/umd/react-dom.development.js"></script>

                <div id="app"></div>





                function ComponentDidMount() {
                const [count, setCount] = React.useState(0);
                React.useEffect(() => {
                console.log('componentDidMount');
                }, );

                return (
                <div>
                <p>componentDidMount: {count} times</p>
                <button
                onClick={() => {
                setCount(count + 1);
                }}
                >
                Click Me
                </button>
                </div>
                );
                }

                ReactDOM.render(
                <div>
                <ComponentDidMount />
                </div>,
                document.querySelector("#app")
                );

                <script src="https://unpkg.com/react@16.7.0-alpha.0/umd/react.development.js"></script>
                <script src="https://unpkg.com/react-dom@16.7.0-alpha.0/umd/react-dom.development.js"></script>

                <div id="app"></div>





                function ComponentDidUpdate() {
                const [count, setCount] = React.useState(0);

                const isFirstUpdate = React.useRef(true);
                React.useEffect(() => {
                if (isFirstUpdate.current) {
                isFirstUpdate.current = false;
                return;
                }

                console.log('componentDidUpdate');
                });

                return (
                <div>
                <p>componentDidUpdate: {count} times</p>
                <button
                onClick={() => {
                setCount(count + 1);
                }}
                >
                Click Me
                </button>
                </div>
                );
                }

                ReactDOM.render(
                <ComponentDidUpdate />,
                document.getElementById("app")
                );

                <script src="https://unpkg.com/react@16.7.0-alpha.0/umd/react.development.js"></script>
                <script src="https://unpkg.com/react-dom@16.7.0-alpha.0/umd/react-dom.development.js"></script>

                <div id="app"></div>





                function ComponentDidUpdate() {
                const [count, setCount] = React.useState(0);

                const isFirstUpdate = React.useRef(true);
                React.useEffect(() => {
                if (isFirstUpdate.current) {
                isFirstUpdate.current = false;
                return;
                }

                console.log('componentDidUpdate');
                });

                return (
                <div>
                <p>componentDidUpdate: {count} times</p>
                <button
                onClick={() => {
                setCount(count + 1);
                }}
                >
                Click Me
                </button>
                </div>
                );
                }

                ReactDOM.render(
                <ComponentDidUpdate />,
                document.getElementById("app")
                );

                <script src="https://unpkg.com/react@16.7.0-alpha.0/umd/react.development.js"></script>
                <script src="https://unpkg.com/react-dom@16.7.0-alpha.0/umd/react-dom.development.js"></script>

                <div id="app"></div>





                function ComponentWillUnmount() {
                function ComponentWillUnmountInner(props) {
                React.useEffect(() => {
                return () => {
                console.log('componentWillUnmount');
                };
                }, );

                return (
                <div>
                <p>componentWillUnmount</p>
                </div>
                );
                }

                const [count, setCount] = React.useState(0);

                return (
                <div>
                {count % 2 === 0 ? (
                <ComponentWillUnmountInner count={count} />
                ) : (
                <p>No component</p>
                )}
                <button
                onClick={() => {
                setCount(count + 1);
                }}
                >
                Click Me
                </button>
                </div>
                );
                }

                ReactDOM.render(
                <div>
                <ComponentWillUnmount />
                </div>,
                document.querySelector("#app")
                );

                <script src="https://unpkg.com/react@16.7.0-alpha.0/umd/react.development.js"></script>
                <script src="https://unpkg.com/react-dom@16.7.0-alpha.0/umd/react-dom.development.js"></script>

                <div id="app"></div>





                function ComponentWillUnmount() {
                function ComponentWillUnmountInner(props) {
                React.useEffect(() => {
                return () => {
                console.log('componentWillUnmount');
                };
                }, );

                return (
                <div>
                <p>componentWillUnmount</p>
                </div>
                );
                }

                const [count, setCount] = React.useState(0);

                return (
                <div>
                {count % 2 === 0 ? (
                <ComponentWillUnmountInner count={count} />
                ) : (
                <p>No component</p>
                )}
                <button
                onClick={() => {
                setCount(count + 1);
                }}
                >
                Click Me
                </button>
                </div>
                );
                }

                ReactDOM.render(
                <div>
                <ComponentWillUnmount />
                </div>,
                document.querySelector("#app")
                );

                <script src="https://unpkg.com/react@16.7.0-alpha.0/umd/react.development.js"></script>
                <script src="https://unpkg.com/react-dom@16.7.0-alpha.0/umd/react-dom.development.js"></script>

                <div id="app"></div>






                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited Nov 11 at 23:08

























                answered Nov 11 at 22:49









                Yangshun Tay

                8,83153667




                8,83153667






























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