Pure Javascript: a Function Like jQuery's isNumeric() [Duplicate]

Question

Is there is any function like isNumeric in pure JavaScript?

I know jQuery has this function to check the integers.

Accepted Answer

There's no isNumeric() type of function, but you could add your own:

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

NOTE: Since parseInt() is not a proper way to check for numeric it should NOT be used.

Answer 2

This should help:

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

Answer 3

function IsNumeric(val) {
    return Number(parseFloat(val)) === val;
}

Answer 4

There is Javascript function isNaN which will do that.

isNaN(90)
=>false

so you can check numeric by

!isNaN(90)
=>true

Answer 5

var str = 'test343',
    isNumeric = /^[-+]?(\d+|\d+\.\d*|\d*\.\d+)$/;

isNumeric.test(str);

Answer 6

isFinite(String(n)) returns true for n=0 or '0', '1.1' or 1.1,

but false for '1 dog' or '1,2,3,4', +- Infinity and any NaN values.

6 Answers