Built-in Functions

call()	apply()
call() method takes arguments separately.	apply() method takes arguments as an array.
call() accepts an list of arguments	apply() accepts a single array of arguments.
individual arguments of varying type	array input with similar elements

function intro(name, profession){
    console.log(name + ', ' + profession);
    console.log(this);
}

intro('Steve', 'Captain America');

call()

into.call(undefined, 'Tony', 'Iron Man');

apply()

intro.apply(undefined, ['Natasha', 'Black Widow']);

• Withcall()andapply()method, you can write a method that can be used on different objects.

• Withcall()andapply()method, we call an existing function and change the function context i.e. the value of the this object.

bind()

bind() allows us to make a copy of the function and then change the value of the this object.

let person1 = {
    name: 'John',
    getName: function(){
        return this.name;
    }
}

let person2 = { name : 'Jane' };

let getNameCopy = person1.getName.bind(person2);
console.log(getNameCopy());            //Jane