Amazon - Show percentages for review scores

Adds the percentage of people who gave each rating to the review table

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(I already have a user script manager, let me install it!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @name           Amazon - Show percentages for review scores
// @description    Adds the percentage of people who gave each rating to the review table
// @author         James Skinner <[email protected]> (http://github.com/spiralx)
// @namespace      http://spiralx.org/
// @version        1.0.0
// @icon           data:image/png;base64,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
// @icon64         data:image/png;base64,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
// @match          *://*.amazon.tld/*
// @grant          none
// ==/UserScript==

/* jshint asi: true, esnext: true */

(function(window, document) {
  'use strict'

  /* Match elements using selector, call func(elem, idx) on each */
  function $each(selector, func) {
    Array.from(document.querySelectorAll(selector)).forEach(func)
  }

  // --------------------------------------------------------------

  var el = document.querySelector('#summaryStars, .totalReviewCount'),
      total = el && parseInt(el.textContent)

  if (total) {
    $each('#histogramTable td:last-child a', a => {
      var num = parseInt(a.textContent),
          pct = 100 * (num / total)

      if (num > 0) {
        a.innerHTML = `${num} - <b>${pct.toFixed(0)}%</b>`
      }
    })
  }

})(window, document)