I see a lot of confusion among the javascript developers when it comes to casting in javascript.

Casting To A Number

let's say you have a String and you want to convert it to a Number. one would say I will use parseInt() or parseFloat().

but there is even an easier way of doing it. no need to be worried if it is an Integer or Float.

Yeah, it's possible to cast to a number by using the unary plus operator

+'20' === 20; // returns true
 
var str = "20";
var num = +str; // returns 20
 
str = "20.3";
num = +str // returns 20.3

Casting To A String

to cast a number to a string there is a tricky way of doing it.

'' + 60 === '60'; // returns true
 
var myInt = 60;
var myStr = myInt + ''; // returns "60"

Casting To A Boolean

you can cast to boolean by using the not operator twice !!.
I see mostly people using this in their return statements. instead of doing if else. they use !!.

 
!!null === !!NaN === !!undefined === !!'' === !!0 === false
!!"Any String" === !!"2" === !!"0" === true
 

I hope you found this tutorial useful.

⋅ javascript ⋅ , , ⋅ 1 comment