code: function pageRange(selected, numPages, num) {
    let selectedPos = Math.ceil(num / 2);
    let start = (selected < selectedPos) ? 1
      : selected - selectedPos + 1;
    let len = (numPages < start + num - 1) ? numPages - start + 1
      : num;
  
    return Array
      .apply(null, Array(len))
      .map((u, i) => start + i);
  }
docs: Returns an array with the range of pages to be displayed according to the params passed
  @param {Number} selected The selected page number
  @param {Number} numPages The total number of pages
  @param {Number} num      The number of pages to display
  @return {Array<Number>}