Why if ([].length) {console.log('true');} else console.log('false'), gets false?

Question

I just saw a js question which is:

What's the result of:

if ([]) {console.log(1);}  
if ([].length) {console.log(2);}  
if ({} === {}) {console.log(3);}  
if ('' == 0) {console.log(4);}

I tried with the console and it gave

1
4

Why [].length gives false? Is the length undefined?

Does this answer your question? [Why doesn't equality check work with arrays](https://stackoverflow.com/questions/30820611/why-doesnt-equality-check-work-with-arrays) — Naren, Jan 10 '21 at 18:39

m90 · Accepted Answer · 2021-01-10T19:15:59.783

3

The length of an empty Array is 0, which is a "falsy" value in JavaScript.

See MDN for further reference:

edited Jan 10 '21 at 19:15

answered Jan 10 '21 at 18:37

m90

1 Answers1