How to check if a string contains a number in JavaScript?

Question

I don\'t get how hard it is to discern a string containing a number from other strings in JavaScript.

Number(\'\') evaluates to 0, while

Answer 1

You can always do:

function isNumber(n)
{
    if (n.trim().length === 0)
        return false;
    return !isNaN(n);
}