'isNaN()' Syntax, Parameters and Note : isNaN « Javascript Methods « JavaScript Reference

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2. Javascript Methods
3. isNaN

'isNaN()' Syntax, Parameters and Note

Note:

Is the specified string NOT numeric. 
Returns true or false.
    
Syntax:
    
isNaN(param1)

Parameters:
    param1   Required; the string to be evaluated.

    

      
      

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