Improve the organization of my JavaScript code

This code snippet is specifically designed for a shoe website, where it automatically adds the shoe in the desired size to your cart as soon as the page loads.

The "skuAndSize" variable represents the shoe size used by the website. In this case, a selectedIndex value of 7 corresponds to size 10.

var size_i_want = "10";
var how_many = 1;

function addToCart()
{
  var sizesList=document.getElementsByName("skuAndSize")[0];
  function setSizeValue()
   {
       document.getElementsByName("skuAndSize")[0].selectedIndex = 7;
    }
   if(sizesList != undefined)
    {
      setSizeValue();
      document.getElementsByClassName("add-to-cart")[0].click();
    }
  else
    {
     setTimeout("addToCart()", 5);
    }
 }
setTimeout("addToCart()", 5);

Is there a way to optimize this code for faster execution? It is input via a Chrome extension, and below is the manifest.json file. Although it may not directly impact the program's speed, any suggestions for improvement are welcome:

{
    "name": "shoe_program",
    "version": "1.0",
    "manifest_version": 2,
    "description": "",
    "permissions": [
        "tabs",
        "contentSettings"
    ],

    "icons": {
        "128": "icon.png"
    },
    "browser_action": {
        "default_icon": "icon.png",
        "default_title": "SneakerATC extension [SIZE-10]"
    },
    "content_scripts": [
        {
            "matches": [
                "http://*.nike.com/*"
            ],
            "js": [
                "testing.js"
            ]
        }
    ],
    "web_accessible_resources": [
        "script.js"
    ]
}

Answer №1

While there may be some small optimizations that could be made to this code, such as calling .selectedIndex on sizeList within the setSizeValue function, the overall impact on performance is most likely minimal. By utilizing the cached value of

document.getElementsByName("sizeAndSku")[0]
instead of repeating the .getElementsByName method call, you can eliminate unnecessary function calls and potentially see a slight improvement in efficiency.

Although these optimizations may not result in a significant speed boost, they can help streamline the code and reduce redundancy. While the practical impact may be minimal in most cases, every little improvement counts.

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