locutus/php/array/array_key_first.js

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

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.array_key_first = array_key_first;
const _phpTypes_ts_1 = require("../_helpers/_phpTypes.js");
function array_key_first(input) {
    //      discuss at: https://locutus.io/php/array_key_first/
    // parity verified: PHP 8.3
    //     original by: Kevin van Zonneveld (https://kvz.io)
    //       example 1: array_key_first({ a: 1, b: 2 })
    //       returns 1: 'a'
    //       example 2: array_key_first(['x', 'y'])
    //       returns 2: 0
    //       example 3: array_key_first([])
    //       returns 3: null
    const [firstKey] = Object.keys(input);
    return typeof firstKey === 'string' ? (0, _phpTypes_ts_1.normalizeArrayKey)(firstKey) : null;
}