YouTipJavaScript isFinite() Function
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JavaScript isFinite() Function
Definition and Usage
The isFinite() function determines whether a value is a finite, legal number.
Tip: If the number is positive or negative infinity, or NaN (Not a Number), the method returns false.
Syntax
isFinite(value)Parameter Values
| Parameter | Description |
|---|---|
| value | Required. The value to be tested. |
Return Value
| Type | Description |
|---|---|
| Boolean | Returns true if the value is a finite number, otherwise returns false. |
Technical Details
| JavaScript Version: | 1.0 |
More Examples
Example
Check if a number is finite:
var a = isFinite(123); // true
var b = isFinite(-1.23); // true
var c = isFinite(5-2); // true
var d = isFinite(0); // true
var e = isFinite("Hello"); // false
var f = isFinite("2005/12/12"); // falseOutput result:
true
true
true
true
false
false