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Version: 3.35.1

isFinite

The global isFinite() function determines whether the passed value is a finite number. If needed, the parameter is first converted to a number.

Syntax​

isFinite(testValue)

Parameters​

  • testValue
    • : The value to be tested for finiteness.

Return value​

false if the argument is (or will be coerced to) positive or negative Infinity or NaN or undefined; otherwise, true.

Description​

isFinite is a function property of the global object.

You can use this function to determine whether a number is a finite number. The isFinite function examines the number in its argument. If the argument is NaN, positive infinity, or negative infinity, this method returns false; otherwise, it returns true.