Closure in JavaScript
You all must have heard about this term all the time in interviews , on diff js websites pretty much everywhere. Let’s have a discussion on it today
- What is Closure?
In simple terms if I have to explain this to anyone I will say when we want to use something of local scope as global scope we use closures.
We all know that if we define a variable inside a function then we can’t use it inside another function. Right?
Here comes the closure, using it we can use a variable define inside one function in another function. Let’s take an example.
In the above example we are writing a simple sum function and in return we are returning another function. Try writing how you will do this example without closure and try to identify pros and cons of both.
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Now what is happening is example:
When we see function sum , variable a of function sum and function add are in same scope of function sum because of which variable a is being accessed by function add later on.
You can call a() any number of times passing different values ,try to check the output.
- Basic uses of closures:
Implementing Currying concept
To have the protected private behavior of OOPS
Have fun writing and trying different examples using closure.
Hope this helps you !!!
