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dependency list useeffect

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Mateusz Przybylski answered on June 9, 2022 Popularity 10/10 Helpfulness 2/10

answer dependency list useeffect

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dependency list useeffect

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import { useEffect } from 'react';
function MyComponent() {
  useEffect(() => {
    // Runs ONCE after initial rendering
  }, []);
}

Popularity 10/10 Helpfulness 2/10 Language whatever

Source: dmitripavlutin.com

Tags: list use-effect whatever

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Contributed on Jun 09 2022

Mateusz Przybylski

0 Answers Avg Quality 2/10

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useeffect dependency check

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const usePrevious = (value, initialValue) => {
  const ref = useRef(initialValue);
  useEffect(() => {
    ref.current = value;
  });
  return ref.current;
};

Popularity 8/10 Helpfulness 3/10 Language javascript

Source: stackoverflow.com

Tags: javascript j

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Contributed on Mar 02 2023

Graceful Gorilla

0 Answers Avg Quality 2/10

useeffect dependency check

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const useEffectDebugger = (effectHook, dependencies, dependencyNames = []) => {
  const previousDeps = usePrevious(dependencies, []);

  const changedDeps = dependencies.reduce((accum, dependency, index) => {
    if (dependency !== previousDeps[index]) {
      const keyName = dependencyNames[index] || index;
      return {
        ...accum,
        [keyName]: {
          before: previousDeps[index],
          after: dependency
        }
      };
    }

    return accum;
  }, {});

  if (Object.keys(changedDeps).length) {
    console.log('[use-effect-debugger] ', changedDeps);
  }

  useEffect(effectHook, dependencies);
};

Popularity 7/10 Helpfulness 2/10 Language javascript

Source: stackoverflow.com

Tags: javascript use-effect u

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Contributed on Mar 02 2023

Graceful Gorilla

0 Answers Avg Quality 2/10

useEffect react dependency

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function EffectsDemoTwoStatesWithDependeny() {
  const [title, setTitle] = useState("default title");
  const titleRef = useRef();
  const [darkMode, setDarkMode] = useState(false);
  useEffect(() => {
    console.log("useEffect");
    document.title = title;
  }, [title]);
  console.log("render");
  const handleClick = () => setTitle(titleRef.current.value);
  const handleCheckboxChange = () => setDarkMode((prev) => !prev);
  return (
    <div className={darkMode ? "view dark-mode" : "view"}>
      <label htmlFor="darkMode">dark mode</label>
      <input
        name="darkMode"
        type="checkbox"
        checked={darkMode}
        onChange={handleCheckboxChange}
      />
      <input ref={titleRef} />
      <button onClick={handleClick}>change title</button>
    </div>
  );
}

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: blog.logrocket.com

Tags: javascript j

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Contributed on Jul 06 2022

Depressed Dugong

0 Answers Avg Quality 2/10

dependency list useeffect

Comment

import { useEffect, useState } from 'react';
function MyComponent({ prop }) {
  const [state, setState] = useState('');
  useEffect(() => {
    // Runs ONCE after initial rendering
    // and after every rendering ONLY IF `prop` or `state` changes
  }, [prop, state]);
}

Popularity 9/10 Helpfulness 1/10 Language javascript

Source: dmitripavlutin.com

Tags: javascript j

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Contributed on Jun 09 2022

Mateusz Przybylski

0 Answers Avg Quality 2/10

dependency list useeffect

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useeffect dependency check

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