Discussion on "What are Double shots ( !! ) in JavaScript ?"

Akshay Sushir · 2020-09-06T07:31:04.259Z

What is !! in JavaScript ? where & how we can use it ? Let's discuss some feature of !! "Double Shots or Double Exclamation" in JavaScript. So where it can be helpful, let's say we have some production grade application where we have some code that g...

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George Jempty (Dexygen)

Sep 6, 2020

I used to use

!!foobar

But now use

Boolean(foobar); // function, NOT object preceded by new

As it expresses the intent more clearly.

FeStack

Sep 6, 2020

Hi Akshay,

I use this a lot during coding. This is the best way to check null or undefined I guess.

Akshay Sushir

Sep 6, 2020

Yes it converts 0, null or Undefined to Boolean true or false.

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What are Double shots ( !! ) in JavaScript ?

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