everyutil/string/stringEditDistance.js

A comprehensive library of lightweight, reusable utility functions for JavaScript and TypeScript, designed to streamline common programming tasks such as string manipulation, array processing, date handling, and more.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.stringEditDistance = void 0;
/**
 * Computes the Levenshtein distance between two strings.
 * @author @dailker
 * @param {string} a
 * @param {string} b
 * @returns {number}
 */
function stringEditDistance(a, b) {
    const dp = Array.from({ length: a.length + 1 }, () => Array(b.length + 1).fill(0));
    for (let i = 0; i <= a.length; i++)
        dp[i][0] = i;
    for (let j = 0; j <= b.length; j++)
        dp[0][j] = j;
    for (let i = 1; i <= a.length; i++) {
        for (let j = 1; j <= b.length; j++) {
            dp[i][j] = Math.min(dp[i - 1][j] + 1, dp[i][j - 1] + 1, dp[i - 1][j - 1] + (a[i - 1] === b[j - 1] ? 0 : 1));
        }
    }
    return dp[a.length][b.length];
}
exports.stringEditDistance = stringEditDistance;