JS Practice — Built-in Objects

Function.prototype.call() — typeof this

📖 Usage Example

const arr = [1, 2, 3]
Math.max.call(null, ...arr)  // → 3

Use call() to invoke built-in methods with a custom this or argument list.

fn.call() — this is an object

When you pass an object as thisArg, this inside the function will be that object. typeof that object is 'object'.

Challenge: Verify that typeof getThis.call({x: 1}) returns 'object'.

💡 Hints (1)