check variable number javascript code example

Example 1: javascript check if variable is number

function isNumber(n) {
  return !isNaN(parseFloat(n)) && !isNaN(n - 0);
}

Example 2: js is variable int

// The === operator is used for checking
// the value and the type of a variable

var data = 1;

if (data === parseInt(data, 10))
    alert("data is integer")
else
    alert("data is not an integer")