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How do you check if a variable is a number in JavaScript?

Answer»

To CHECK if a VARIABLE is a number, we can use isNaN() function in JAVASCRIPT. It DETERMINES WHETHER a value is not a number.

Example

isNaN(123) //false
isNaN(0) //false
isNaN(-1.23) //false
isNaN(5-2) //false
isNaN('') //false
isNaN(true) //false
isNaN(undefined) //true
isNaN('123') //false
isNaN('Hello') //true
isNaN('2005/12/12') //true
isNaN(NaN) //true
isNaN('NaN') //true
isNaN(0 / 0) //true



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