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isFinite · WebPlatform Docs

Determines whether a supplied number is finite.

isFinite(number)

number

Required. Any numeric value

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

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

• isNaN Function
• Infinity
• NaN

• Microsoft Developer Network: Article

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