everyutil/string/extractKeywords.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.extractKeywords = void 0;
/**
 * Extracts keywords from a string, removing stopwords and punctuation.
 *
 * Example: extractKeywords("The cat sat on the mat.", ["the", "on"]) → ['cat', 'sat', 'mat']
 *
 * @author @dailker
 * @param {string} str - The input string.
 * @param {string[]} [stopwords=[]] - Words to exclude from the result.
 * @returns {string[]} Array of keywords.
 */
function extractKeywords(str, stopwords = []) {
    const stops = new Set(stopwords.map(w => w.toLowerCase()));
    return str
        .toLowerCase()
        .replace(/[^\w\s]/g, '')
        .split(/\s+/)
        .filter(w => w && !stops.has(w));
}
exports.extractKeywords = extractKeywords;