@casual-simulation/aux-common/polyfill/Array.first.polyfill.js

Common library for AUX projects

if (!Array.prototype['first']) {
    Object.defineProperty(Array.prototype, 'first', {
        value: function () {
            // 1. Let O be ? ToObject(this value).
            if (this == null) {
                throw new TypeError('"this" is null or not defined');
            }
            const o = Object(this);
            // 2. Let len be ? ToLength(? Get(O, "length")).
            const len = o.length >>> 0;
            // 3. Check if we have at least one element
            if (len > 0) {
                // 4. Return first element
                return o[0];
            }
            // 5. Return undefined.
            return undefined;
        },
        configurable: true,
        writable: true,
    });
}
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