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.

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.

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.

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. . .