numbers - Compare x ='' and x = 0 in Javascript -

i have following:

var = 0;  if (number(a) != '') {     alert('hi'); } 

i never alert though not empty, 0 , need value numeric calculations.enter code here

what's going on here?

the != operator type conversion if needed, '' converted numeric value 0.

you can use !== operator avoid type conversion:

var = 0;  if (number(a) !== '') {     alert('hi'); }