Check if Whole Number for large Value

Asked May 04 '18 at 10:52

Active May 04 '18 at 10:56

Viewed 68 times

The isWholeNumber Method works fine for number less than 16 digits but it does not work with larger values. How do i find if a large digit is whole number or not ?

var isWholeNumber = num => num % 1 == 0;

isWholeNumber(900719925443099.122) // false

isWholeNumber(9007199254430991.122) // true

asked May 04 '18 at 10:52

Rohail Najam

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Hint: try printing the second value to the console. – Joachim Sauer May 04 '18 at 10:55
i just did. the result it same. Let me know if i am missing anything ? – Rohail Najam May 04 '18 at 10:58
I think you need a big number library for this check. The problem is the limitation of the numeric type in Javascript. – gil.fernandes May 04 '18 at 11:02
What do you want to achieve by `isWholeNumber` method ? Do you want to check whether it is numeric value or non-numeric ? And expected output for both should be true ? – SpiderCode May 04 '18 at 11:02
@SpiderCode i would like to check if the number passed is wholeNumber or not. Both should be false as both are not complete whole numbers. – Rohail Najam May 04 '18 at 11:05
@gil.fernandes is there a way without library. ? – Rohail Najam May 04 '18 at 11:06
@RohailNajam I do not think there is, because Javascript has this limitation on its number type. So what you cannot do with native tools, you have to do with some libraries. – gil.fernandes May 04 '18 at 11:13
@gil.fernandes Alright thanks :) – Rohail Najam May 04 '18 at 11:14
You could convert it to a string and look if there is a dot in it like this: `isWholeNumber = num => num.contains(".")` Not a very elegant solution but i think it would work – ochs.tobi May 04 '18 at 11:15
@ochs.tobi : This will also not work. Because of limitation it will truncate last digits. – SpiderCode May 04 '18 at 11:17

Check if Whole Number for large Value

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