Function.prototype.apply

/**
 * Custom implementation of Function.prototype.apply.
 *
 * Usage:
 * fn.myApply(thisArg, argsArray)
 *
 * @param {unknown} thisArg
 * @param {ArrayLike<unknown> | null | undefined} argsArray
 * @returns {unknown}
 */
Function.prototype.myApply = function (thisArg, argsArray) {
	if (typeof this !== 'function') {
		throw new TypeError('myApply must be called on a function');
	}

	const context =
		thisArg === null || thisArg === undefined ? globalThis : Object(thisArg);

	const tempKey = Symbol('myApply');
	context[tempKey] = this;

	try {
		if (argsArray === null || argsArray === undefined) {
			return context[tempKey]();
		}

		// Support array-like input, not only real arrays.
		const listObject = Object(argsArray);
		const length = Number(listObject.length) >>> 0;
		const args = new Array(length);

		for (let i = 0; i < length; i++) {
			args[i] = listObject[i];
		}

		return context[tempKey](...args);
	} finally {
		delete context[tempKey];
	}
};

/**
Example:

function greet(greeting, punctuation) {
	return `${greeting}, ${this.name}${punctuation}`;
}

greet.myApply({ name: 'Ada' }, ['Hello', '!']);
// 'Hello, Ada!'
*/