Say

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

then

a==b;  // returns true

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

Say

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

then

a==b;  // returns true

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

• javascript

Share Improve this question Follow asked Jan 28, 2015 at 22:18 Bob SBob S 29522 silver badges1212 bronze badges 2

• 1 here is a really good post of == vs. === stackoverflow./questions/523643/… – taesu Commented Jan 28, 2015 at 22:20
• possible duplicate of Does it matter which equals operator (== vs ===) I use in JavaScript parisons? – Alexis King Commented Jan 28, 2015 at 22:21

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2 Answers 2

Sorted by: Reset to default 8

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

"" === 0; // false

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