locutus/esm/php/array/array_search.js

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

export function array_search(needle, haystack, argStrict) {
    //      discuss at: https://locutus.io/php/array_search/
    // parity verified: PHP 8.3
    //     original by: Kevin van Zonneveld (https://kvz.io)
    //        input by: Brett Zamir (https://brett-zamir.me)
    //     bugfixed by: Kevin van Zonneveld (https://kvz.io)
    //     bugfixed by: Reynier de la Rosa (https://scriptinside.blogspot.com.es/)
    //       example 1: array_search('zonneveld', {firstname: 'kevin', middle: 'van', surname: 'zonneveld'})
    //       returns 1: 'surname'
    //       example 2: array_search('3', {a: 3, b: 5, c: 7})
    //       returns 2: 'a'
    const strict = Boolean(argStrict);
    if (needle instanceof RegExp) {
        // Duck-type for RegExp
        let regex = needle;
        if (!strict) {
            // Let's consider case sensitive searches as strict
            const flags = 'i' +
                (needle.global ? 'g' : '') +
                (needle.multiline ? 'm' : '') +
                // sticky is FF only
                (needle.sticky ? 'y' : '');
            regex = new RegExp(needle.source, flags);
        }
        for (const [key, value] of Object.entries(haystack)) {
            if (regex.test(String(value))) {
                return key;
            }
        }
        return false;
    }
    for (const [key, value] of Object.entries(haystack)) {
        // biome-ignore lint/suspicious/noDoubleEquals: non-strict comparison intended
        if ((strict && value === needle) || (!strict && value == needle)) {
            return key;
        }
    }
    return false;
}