locutus/php/strings/strstr.js

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

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.strstr = strstr;
function strstr(haystack, needle, bool) {
    //      discuss at: https://locutus.io/php/strstr/
    // parity verified: PHP 8.3
    //     original by: Kevin van Zonneveld (https://kvz.io)
    //     bugfixed by: Onno Marsman (https://twitter.com/onnomarsman)
    //     improved by: Kevin van Zonneveld (https://kvz.io)
    //       example 1: strstr('Kevin van Zonneveld', 'van')
    //       returns 1: 'van Zonneveld'
    //       example 2: strstr('Kevin van Zonneveld', 'van', true)
    //       returns 2: 'Kevin '
    //       example 3: strstr('name@example.com', '@')
    //       returns 3: '@example.com'
    //       example 4: strstr('name@example.com', '@', true)
    //       returns 4: 'name'
    let pos = 0;
    haystack += '';
    pos = haystack.indexOf(needle);
    if (pos === -1) {
        return false;
    }
    else {
        if (bool) {
            return haystack.substr(0, pos);
        }
        else {
            return haystack.slice(pos);
        }
    }
}