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double bang js

Doubtful Dunlin answered on March 1, 2022 Popularity 9/10 Helpfulness 1/10

answer double bang js

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double bang js

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The double bang is said as (!!True) checks if a value is a truthy or falsey. 

It is very simple.

let num = 0;

console.log(!!num) // -> False

It checks if a value is truthy or falsey without the need of adding things.
Instead, all you need would be two explanation marks (!!)

Popularity 9/10 Helpfulness 1/10 Language javascript

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Contributed on Mar 01 2022

Doubtful Dunlin

0 Answers Avg Quality 2/10

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double bang js

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We use the double bang operator (!!) to check if a value is `truthy` or `falsy`.
That means to check if a value is considered `true` or `false` by JavaScript.

We use it when we need a boolean value according to a non-boolean value,
for example if we need the value `false` if a string is empty, `true` otherwise.
                                 
str = "Double bang operator"; // not empty strings are considered true by JS
console.log(str == true); // false
console.log(!!str); // true
str = ""; // empty strings are considered false by JS
console.log(str == false); // true
console.log(!!str); // false

Truthy values :
 - Objects : {}   // even empty objects
 - Arrays : []   // even empty Arrays
 - Not empty strings : "Anything"
 - Numbers other than 0 : 3.14
 - Dates : new Date()
Falsy values :
 - Empty strings : ""
 - 0
 - null
 - undefined
 - NaN

Popularity 9/10 Helpfulness 2/10 Language javascript

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Tags: double do

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Contributed on May 21 2022

Omar Atri

0 Answers Avg Quality 2/10

double bang js

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