Javascript Reference
Categories: Global

javascript Global isNaN( )

@March 15, 2008, 1:22 a.m.
isNaN( )Firefox/Netscape/NN 2 IE 3 ECMA 1  

isNaN(expression)

  

Returns a Boolean value of true if the expression passed as a parameter does not evaluate to a numeric value. Any expression that evaluates to NaN (such as performing parseInt( ) on a string that does not begin with a numeral) causes the isNaN( ) method to return true.

 
Parameters
 
expression

Any JavaScript expression.

 
Returned Value

Boolean value: true | false.

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