# Javascript check string is number. Number.isInteger() 2018-07-25

Javascript check string is number Rating: 6,8/10 270 reviews

## Number.isInteger()

Description If the target value is an integer, return true, otherwise return false. Actually, isNaN x , isNaN x - 0 , isNaN Number x , Number. The resulting value is then tested to determine whether it is. If you'd like to contribute to the data, please check out and send us a pull request. Return value true if the given value is ; otherwise, false. Such values do not necessarily represent overflow conditions. Origin of NaN values NaN values are generated when arithmetic operations result in undefined or unrepresentable values.

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## Number.isInteger()

Alternatively, in absense of Number. The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone and send us a pull request. Return value A indicating whether or not the given value is an integer. If the value is or infinite, return false. Hence, the necessity of an isNaN function.

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## isNaN()

If it returns true, x will make every arithmetic expression return NaN. This way you can have a function that makes use of the full versatility JavaScript provides by implicitly converting values depending on context. Syntax isNaN v alue Parameters value The value to be tested. . Draft Browser compatibility The compatibility table in this page is generated from structured data. A NaN also results from attempted coercion to numeric values of non-numeric values for which no primitive numeric value is available.

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## isNaN()

Confusing special-case behavior Since the very earliest versions of the isNaN function specification, its behavior for non-numeric arguments has been confusing. For example, dividing zero by zero results in a NaN — but dividing other numbers by zero does not. When the argument to the isNaN function is not of type , the value is first coerced to a Number. . .

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