How do I check that a number is float or integer?

Posted by Editorial Staff | Updated on

There is a method called Number.isInteger() which is currently implemented in everything but IE. MDN also provides a polyfill for other browsers:

However, for most uses cases, you are better off using Number.isSafeInteger which also checks if the value is so high/low that any decimal places would have been lost anyway. MDN has a polyfil for this as well. (You also need the isInteger pollyfill above.)


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