call and apply in JavaScript | call() and apply() methods in JavaScript
In JavaScript call() and apply() methods are used to manually pass an object as a value of 'this' inside a function.
Let us say, you have a function
function Animal(name, age){
this.name = name;
this.age = age;
}
and an object
var Dog = {
color : "black"
}
you can pass Dog as the value of this inside Animal by either using call() or apply() methods as shown below:
Animal.call(Dog,"foo",20)
or
Animal.apply(Dog, ["foo",30])
calling a function using apply() and call() is called Indirect Invocation Pattern.
This is a very popular JavaScript interview question, and I hope now you should be able to answer this question confidently
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