js check if string is integer

Number.isInteger(value)

//returns a Booleanif (typeof myVar === 'string'){
    //I am indeed a string
}isNaN(num)         // returns true if the variable does NOT contain a valid number

isNaN(123)         // false
isNaN('123')       // false
isNaN('1e10000')   // false (This translates to Infinity, which is a number)
isNaN('foo')       // true
isNaN('10px')      // truefunction isInt(str) {
  return !isNaN(str) && Number.isInteger(parseFloat(str));
}