SOURCE

Function.prototype.apply = function(context, rest) {
    const ctx = context || window;

    ctx.fn = this;

    let result;
    if (rest) {
        result = eval("ctx.fn(...rest)");
    }
    else {
        result = eval("ctx.fn()");
    }

    delete ctx.fn;

    return result;
};

const me = { name: 'Jack' }
function say() {
  console.log(`My name is ${this.name || 'default'}`);
}
say.apply(me)