026 — 2693. Call Function with Custom Context.js

/**
 * @param {Object} context
 * @param {any[]} args
 * @return {any}
 */
Function.prototype.callPolyfill = function(context, ...args) {
    Object.defineProperty(context, 'fn', {
      value: this,
      enumerable: false,
    });

    return context.fn(...args);
}

/**
* function increment() { this.count++; return this.count; }
* increment.callPolyfill({count: 1}); // 2
*/