(Built-in) way in JavaScript to check if a string is a valid number

Question

I\'m hoping there\'s something in the same conceptual space as the old VB6 IsNumeric() function?

Answer 1

PFB the working solution:

 function(check){ 
    check = check + "";
    var isNumber =   check.trim().length>0? !isNaN(check):false;
    return isNumber;
    }