JavaScript Interview Questions

Both 'call' and 'apply' are used to invoke functions with a specified 'this' value. The difference lies in how arguments are passed to the function: 'call' accepts a list of arguments, while 'apply' accepts a single array of arguments. These methods are useful for borrowing functions and setting the context for the 'this' keyword.

Here is an example demonstrating the difference between 'call' and 'apply':

function greet(greeting, punctuation) {
    console.log(greeting + ', ' + this.name + punctuation);
}

let person = { name: 'John' };

// Using call
greet.call(person, 'Hello', '!'); // 'Hello, John!'

// Using apply
greet.apply(person, ['Hi', '.']); // 'Hi, John.'

In this example, the greet function is called with different contexts using call and apply. The call method passes arguments individually, while the apply method passes arguments as an array.