var numarr = [8, 32, 128]
var formatted = []
//create three numbers of different lengths
numarr.forEach(num => {
  formatted.push(
    num.toLocaleString('en-US', {//this is the function that formats the numbers
      minimumIntegerDigits: 2, //change this to your minimum length
      useGrouping: false
    })
  )
})
//after running this, formatted == [08, 32, 128]