![How To Check If A Variable Is A Number In JavaScript | by Sanchitha SR | JavaScript in Plain English How To Check If A Variable Is A Number In JavaScript | by Sanchitha SR | JavaScript in Plain English](https://miro.medium.com/v2/resize:fit:906/1*uWtpzHYFKQpbCOyO_g-D0A.png)
How To Check If A Variable Is A Number In JavaScript | by Sanchitha SR | JavaScript in Plain English
![boolean - In JavaScript, why is "0" equal to false, but when tested by 'if' it is not false by itself? - Stack Overflow boolean - In JavaScript, why is "0" equal to false, but when tested by 'if' it is not false by itself? - Stack Overflow](https://i.stack.imgur.com/mmvud.png)
boolean - In JavaScript, why is "0" equal to false, but when tested by 'if' it is not false by itself? - Stack Overflow
![Samantha Ming on Twitter: "TLDR - How the !! works in #JavaScript The first "!" coerce the value to a boolean and inverse it. The second "!" reverse it back. Hence the Samantha Ming on Twitter: "TLDR - How the !! works in #JavaScript The first "!" coerce the value to a boolean and inverse it. The second "!" reverse it back. Hence the](https://pbs.twimg.com/media/ERy24QBUEAAAWV9.jpg:large)
Samantha Ming on Twitter: "TLDR - How the !! works in #JavaScript The first "!" coerce the value to a boolean and inverse it. The second "!" reverse it back. Hence the
![boolean - In JavaScript, why is "0" equal to false, but when tested by 'if' it is not false by itself? - Stack Overflow boolean - In JavaScript, why is "0" equal to false, but when tested by 'if' it is not false by itself? - Stack Overflow](https://i.stack.imgur.com/MKgie.png)
boolean - In JavaScript, why is "0" equal to false, but when tested by 'if' it is not false by itself? - Stack Overflow
![boolean - In JavaScript, why is "0" equal to false, but when tested by 'if' it is not false by itself? - Stack Overflow boolean - In JavaScript, why is "0" equal to false, but when tested by 'if' it is not false by itself? - Stack Overflow](https://i.stack.imgur.com/0a1Q9.jpg)