javascript - How do I Convert NaN to a 0? - Stack Overflow

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When a value is not entered in one of my forms, it creates a later result of NaN in the javascript. I just want to declare anytime NaN would show that it would instead show 0. I thought that by simply adding

<script>

a = a || 0

</script>

to the beginning of my scripts that it would be fine.

Is there anyway to say that NaN will just always equal 0, no matter what the situation?

When a value is not entered in one of my forms, it creates a later result of NaN in the javascript. I just want to declare anytime NaN would show that it would instead show 0. I thought that by simply adding

<script>

a = a || 0

</script>

to the beginning of my scripts that it would be fine.

Is there anyway to say that NaN will just always equal 0, no matter what the situation?

• javascript
• forms
• nan

Share Improve this question Follow asked May 2, 2013 at 15:06 user2339898user2339898 9155 bronze badges 4

• isNaN() exists so you don't have to convert it to 0. – Jordan Commented May 2, 2013 at 15:11
• @Jordan You missed the point of the question. The OP wants NaN to always equal 0. – Danny Beckett Commented May 2, 2013 at 15:13
• Right.. Why? Just use isNaN(). – Jordan Commented May 2, 2013 at 15:14
• @Jordan I suggest you re-read the question thoroughly. – Danny Beckett Commented May 2, 2013 at 15:15

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1 Answer 1

Sorted by: Reset to default 8

NaN is a global object that you cannot override.

Reference: https://developer.mozilla/en-US/docs/JavaScript/Reference/Global_Objects/NaN

One alternative is to use isNaN then

a = isNaN(a) ? 0 : a;

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