Get pixel value by increment in javascript to handle element sizes

pixel.js

const pixel = ((init = 0) => {
  let pixelValue = init

  function increment(value) {
    pixelValue += value
  }

  return {
    getByIncrement: value => {
      increment(value)
      return pixelValue + 'px'
    }
  }
})()

console.log(
  pixel.getByIncrement(100), // 100px
  pixel.getByIncrement(100) // 200px
)