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. === stackoverflow.com/questions/523643/… — taesu
– taesu, Commented Jan 28, 2015 at 22:20
possible duplicate of Does it matter which equals operator (== vs ===) I use in JavaScript comparisons? — Alexis King
– Alexis King, Commented Jan 28, 2015 at 22:21

Alexis King · Accepted Answer · 2015-01-28 22:19:01Z

8

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, 2015 at 22:19

Alexis King

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Comments

Raftx24 · Accepted Answer · 2015-01-28 22:23:10Z

1

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

answered Jan 28, 2015 at 22:23

Raftx24

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