sanger/limber

// Begin Array.fill polyfil
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/fill#Polyfill
if (!Array.prototype.fill) {
  Object.defineProperty(Array.prototype, 'fill', {
    value: function (value) {
      // Steps 1-2.
      if (this == null) {
        throw new TypeError('this is null or not defined')
      }

      let O = Object(this)

      // Steps 3-5.
      let len = O.length >>> 0

      // Steps 6-7.
      let start = arguments[1]
      let relativeStart = start >> 0

      // Step 8.
      let k = relativeStart < 0 ? Math.max(len + relativeStart, 0) : Math.min(relativeStart, len)

      // Steps 9-10.
      let end = arguments[2]
      let relativeEnd = end === undefined ? len : end >> 0

      // Step 11.
      let final = relativeEnd < 0 ? Math.max(len + relativeEnd, 0) : Math.min(relativeEnd, len)

      // Step 12.
      while (k < final) {
        O[k] = value
        k++
      }

      // Step 13.
      return O
    },
  })
}
// End Array.fill polyfil