How can I distinguish 0 and empty string in javascript?

Question

Say

a="";  // empty String
b=0;

then

a==b;  // returns true

What Test could I build to return true only if I compare two empty strings or two zero's?

here is a really good post of == vs. === http://stackoverflow.com/questions/523643/difference-between-and-in-javascript — taesu, Jan 28 '15 at 22:20
possible duplicate of [Does it matter which equals operator (== vs ===) I use in JavaScript comparisons?](http://stackoverflow.com/questions/359494/does-it-matter-which-equals-operator-vs-i-use-in-javascript-comparisons) — Alexis King, Jan 28 '15 at 22:21

score 7 · Accepted Answer · answered Jan 28 '15 at 22:19

7

Use the strict comparison operator, ===. This will not use JavaScript's default type coercion, so you will get the correct result.

"" === 0; // false

answered Jan 28 '15 at 22:19

Alexis King

score 1 · Answer 2 · answered Jan 28 '15 at 22:23

1

use === instead of == for checking undifined and zero or false compare

answered Jan 28 '15 at 22:23

Raftx24

2 Answers2