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@jest/diff-sequences

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@jest/diff-sequences

Compare items in two sequences to find a longest common subsequence

30.0.0-beta.6
Version published
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5
Created

What is @jest/diff-sequences?

@jest/diff-sequences is a utility package used to efficiently compare sequences, such as arrays or strings, to find differences between them. It is particularly useful in testing scenarios where you need to assert the differences between expected and actual outputs.

What are @jest/diff-sequences's main functionalities?

Diffing Sequences

This feature allows you to compare two sequences and find the differences between them. The code sample demonstrates how to use the diffSequences function to compare two arrays and output the differences and commonalities.

const diffSequences = require('@jest/diff-sequences');

const a = [1, 2, 3, 4, 5];
const b = [1, 2, 4, 5, 6];

const result = [];
diffSequences(a.length, b.length, (indexA, indexB) => a[indexA] === b[indexB], (nCommon, aStart, bStart) => {
  result.push({ type: 'common', aStart, bStart, nCommon });
}, (nCommon, aStart, bStart) => {
  result.push({ type: 'different', aStart, bStart, nCommon });
});

console.log(result);

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Package last updated on 03 Jun 2025

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