locutus/powershell/string/indexof.js

Locutus other languages' standard libraries to JavaScript for fun and educational purposes

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.indexof = indexof;
function indexof(needle, haystack, startIndex) {
    //      discuss at: https://locutus.io/powershell/indexof/
    // parity verified: PowerShell 7.4
    //     original by: Kevin van Zonneveld (https://kvz.io)
    //       example 1: indexof('or', 'Hello World')
    //       returns 1: 7
    //       example 2: indexof('x', 'Hello World')
    //       returns 2: -1
    //       example 3: indexof('o', 'Hello World', 5)
    //       returns 3: 7
    const source = String(haystack);
    const search = String(needle);
    if (startIndex === undefined) {
        return source.indexOf(search);
    }
    return source.indexOf(search, Math.max(0, Math.trunc(Number(startIndex))));
}