How to check the variable is not null , not empty but zero should pass in javascript

Question

Need to check number is non null , non empty.

But it should pass numerics like 0 1 2 etc.

var xxx=0;
if(xxx){
// for 0 not coming here
}else{
// All empty,undefined,'' should go here  --- 
}

Referred question https://stackoverflow.com/questions/4361585/how-to-check-if-a-variable-is-not-null is similar, but this has a value by itself — Michael Freidgeim, Apr 19 '20 at 04:04

score 11 · Accepted Answer · answered Aug 04 '17 at 18:42

11

You could check for truthy or for zero value.

if (x || x === 0){
    // 0, 1, 2, 3
} else {
    // null, undefined, ''
}

answered Aug 04 '17 at 18:42

Nina Scholz

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score 1 · Answer 2 · answered Aug 04 '17 at 18:51

1

Check this out:

function is_number(val){
if (val || val === 0){
   return true;
} else {
   return false;
}

}
console.log(is_number(0))
console.log(is_number(1))
console.log(is_number(null))
console.log(is_number(""))

answered Aug 04 '17 at 18:51

Standard Number.IsInteger or Number.isFinite may be sufficient – Michael Freidgeim Apr 19 '20 at 04:27

How to check the variable is not null , not empty but zero should pass in javascript

2 Answers2