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useState and useEffect from React, a local state is added to the functional component using the useState Hook. The useEffect Hook updates the document title on every render, showcasing the versatility of React Hooks.
import React, { useState, useEffect } from 'react';
function Example() {
const [count, setCount] = useState(0);
useEffect(() => {
document.title = `You clicked ${count} times`;
});
return (
<div>
<p>You clicked {count} times</p>
<button onClick={() => setCount(count + 1)}>
Click me
</button>
</div>
);
}
export default Example;
setup() method of the Composition API. Unlike React, the setup() method is executed only once, serving as an entry point to the Composition API. This enables the definition of state without recreating it with each call. The following code illustrates the script part of a Vue component, utilizing watchEffect and ref to keep track of a variable (price) and display its updated value.
<script>
import { watchEffect, ref, defineComponent } from "vue";</script>useState facilitates the creation of reactive objects with a two-member array. In Vue’s Composition API, a similar result is achieved by defining reactive objects inside the setup() component without the need for a mutation function. The following Vue example showcases the simplicity of defining and updating a reactive object.
<template>
<p>You clicked {{count}} times</p>
<button @click="count += 1">
Click me
</button>
</template>setup() default behavior prevents such issues, executing before the component creation. Vue’s Composition API shines in complex scenarios, offering more concise and readable code compared to React Hooks.
// React
const [name, setName = useState('Apple');
const [price, setPrice] = useState(20);
const [quantity, setQuantity] = useState(100);useState Hook, while Vue utilizes its syntax, including v-model. The Vue example demonstrates how the value of a local state (name) changes effortlessly.
// React
import { useState } from 'react';<!-- Vue -->
<script>
import { ref } from 'vue';</script>useEffect Hook for this purpose, allowing developers to manage various side effects. Vue’s Composition API offers similar capabilities with the watch and watchEffect methods, each with its own use cases. The Vue example below demonstrates the usage of watchEffect to log changes in the price variable.
<script>
import { watchEffect, ref, defineComponent } from "vue";</script>
useEffect and Vue’s watch and watchEffect methods handle side effects, there are key differences in their usage. React’s useEffect allows manual addition of dependencies, specifying when the effects should be active. Vue’s methods, on the other hand, provide flexibility in tracking changes in variables but require explicit setup.
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