There is a method called Number.isInteger() which is currently implemented in everything but IE. MDN also provides a polyfill for other browsers:
1 2 3 4 5 | Number.isInteger = Number.isInteger || function(value) { return typeof value === 'number' && isFinite(value) && Math.floor(value) === value; }; |
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.)
1 2 3 4 5 6 | if (!Number.MAX_SAFE_INTEGER) { Number.MAX_SAFE_INTEGER = 9007199254740991; // Math.pow(2, 53) - 1; } Number.isSafeInteger = Number.isSafeInteger || function (value) { return Number.isInteger(value) && Math.abs(value) <= Number.MAX_SAFE_INTEGER; }; |
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