39. Function.prototype.bind

Implement your own version of Function.prototype.bind method. The bind method creates a new function that, when called, has its this keyword set to the provided value, with a given sequence of arguments preceding any provided when the new function is called.

Requirements

1. Basic Functionality

• Accept a thisArg parameter to be used as the this value
• Accept optional pre-filled arguments (partial application)
• Return a new function (not call the original)
• The returned function should preserve the bound context and arguments

2. Edge Cases

• Handle null or undefined as thisArg (should default to global object)
• Support partial application (pre-filled arguments)
• Support additional arguments when calling the bound function
• Handle new operator on bound functions (constructor calls)
• Preserve function properties (like length)

Example Usage

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

const person = { name: 'Alice' };

// Using built-in bind
const boundGreet = greet.bind(person, 'Hello');
boundGreet('!'); // "Hello, Alice!"

// Using your implementation
const myBoundGreet = greet.myBind(person, 'Hello');
myBoundGreet('!'); // "Hello, Alice!"