use effect

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useEffect in React vs Watchers and Lifecycle Hooks in Vue

• React's useEffect runs code after a component renders or re-renders and can react to dependency changes or perform clean-up actions.
• Vue's watch and lifecycle hooks like mounted, beforeDestroy, etc., provide similar functionality:
  • Watchers are similar to useEffect with dependencies in that they let you run code in response to specific reactive data changes.
  • Lifecycle Hooks can handle actions on mount, update, or before unmounting the component.

Example in Vue:

javascript
export default {
  data() {
    return { count: 0 }
  },
  watch: {
    count(newVal) {
      console.log("Count changed to:", newVal);
    }
  },
  mounted() {
    console.log("Component mounted");
  }
}

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useEffect in React vs. Watchers and Lifecycle Hooks in Vue

React’s useEffect to run code on mount or when dependencies change:

javascript

Copy code

import { useState, useEffect } from 'react';

function MyComponent() {

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

  useEffect(() => {

    console.log("Component mounted or count changed:", count);

    return () => console.log("Cleanup code runs when component unmounts or count changes");

  }, [count]);

  return (

    <div>

      <p>Count: {count}</p>

      <button onClick={() => setCount(count + 1)}>Increment</button>

    </div>

  );

}

Vue equivalent:

javascript

Copy code

export default {

  data() {

    return { count: 0 }

  },

  watch: {

    count(newVal) {

      console.log("Count changed to:", newVal);

    }

  },

  mounted() {

    console.log("Component mounted");

  },

  beforeUnmount() {

    console.log("Cleanup before component unmounts");

  }

}

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