Why does this not work? if(10<=a<=15) in js

Question

Code
let a=20
if (10<=a<=15){
console.log("hello")
}

It still prints hello

https://code.sololearn.com/Wx34itpKvPPi/?ref=app

Answer 1

The expression 10 <= a <= 15 is evaluated from left to right. Here I added parentheses to get you to understand, how the expression evaluation was performed.

( 10 <= a ) <= 15
( true ) <= 15
( 1 ) <= 15

This eventually, evaluates to true, hence the `if` block was entered.

You probably were trying to achieve this

if( 10 <= a && a <= 15 )

Answer 2

let a=20
//10<=a -> True
//True<=15 -> True

if (10<a<15==true==1) {
console.log("HELLO!😉")
}

Answer 3

Ipang Solo
Thank you so much! I understood :)