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react-fast-compare

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react-fast-compare

Fastest deep equal comparison for React. Great for React.memo & shouldComponentUpdate. Also really fast general-purpose deep comparison.

  • 3.2.2
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What is react-fast-compare?

The react-fast-compare package is a fast deep equal comparison for React. It is optimized for comparing the props or state of React components, although it can be used to compare any data structures. It is particularly useful in shouldComponentUpdate methods to determine if re-rendering is necessary.

What are react-fast-compare's main functionalities?

Deep comparison of objects and arrays

This feature allows for deep comparison of objects and arrays to determine if they are structurally identical.

import isEqual from 'react-fast-compare';

const obj1 = { a: 1, b: { c: 2 } };
const obj2 = { a: 1, b: { c: 2 } };

const areEqual = isEqual(obj1, obj2); // true

Comparison within React lifecycle methods

This code sample demonstrates how react-fast-compare can be used within a React component's shouldComponentUpdate lifecycle method to prevent unnecessary re-renders.

import React from 'react';
import isEqual from 'react-fast-compare';

class MyComponent extends React.Component {
  shouldComponentUpdate(nextProps) {
    return !isEqual(this.props, nextProps);
  }

  render() {
    // Component rendering logic
  }
}

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Package last updated on 18 May 2023

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