wanna check if string contains number (float or integer)

[Mike Kypriotis]

in a forum found this

function isNumber(n) {
  return !isNaN(parseFloat(n)) && isFinite(n);
}

as the best solution, is it? Plus why both !isNAN and isFinite() are used together, which weaknesses each other covers?

[Dormilich]

I don’t know if it is the best solution, but it certainly is a good one.

see https://developer.mozilla.org/en/Jav..._Objects/isNaN why the use of isFinite is required.