isFinite

Summary

Determines whether a supplied number is finite.

Syntax

isFinite(number)

number

Required. Any numeric value

Return Value

Returns true if number is any value other than NaN, -Infinity or Infinity. In those three cases, it returns false.

Examples

isFinite(); // false, because its NaN
isFinite(42); // true
isFinite(-Infinity); //false
isFinite(4 / 0); //false

See also

Other articles

• isNaN Function
• Infinity
• NaN

Attributions

• Microsoft Developer Network: Article