js is integer string code example

Example 1: js check if string is integer

function isInt(str) {
  return !isNaN(str) && Number.isInteger(parseFloat(str));
}

Example 2: how to check if a string is an integer javascript

isNaN(num)         // returns true if the variable does NOT contain a valid number

Example 3: 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")