How to Translate jQuery code into Vanilla JS

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I typically use jQuery as a crutch to get stuff done, and move on to the next problem. However, with the introduction of Stimulus to Rails 6 I'd like to get better writing vanilla JS. I'm having difficulties re-writing the below $.map and $.each line:

handleSuccess(data) {
  const items = $.map(data, notification => { return notification.template })
  let unreadCount = 0
  $.each(data, (i, notification) => {
    if (notification.unread) {
      unreadCount += 1
    }
  });
  this.unreadCountTarget.innerHTML = unreadCount
  this.itemsTarget.innerHTML = items
}

My own attempts fall short of actually working.

items.forEach(data, (i, notification) => {
   if (notification.unread) {
     unreadCount += 1
   }
 });

 items.forEach(element, (i, notification) => {
   if (notification.unread) {
     unreadCount += 1
   }
 });

In your case you can convert $.map() to Array.map(), and convert the counter and the $.each() to an Array.reduce() call. often $.each() is converted to Array.forEach(), but in this case you want to take an array, and convert it to a number, and this transformation is usually done by reducing.

Note: the problem in your own code is caused by the order of parameters - $.each(index, item) vs. Array.forEach(item, index).

Example (not tested) - vanilla under commented jQuery

handleSuccess(data) {
  // const items = $.map(data, notification => { return notification.template })
  const items = data.map(notification => notification.template)

  // $.each(data, (i, notification) => { if (notification.unread) { unreadCount += 1 }});
  const unreadCount = data.reduce((count, notification, i) => notification.unread ? count + 1 : count, 0)

  this.unreadCountTarget.innerHTML = unreadCount
  this.itemsTarget.innerHTML = items
}

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JavaScript has its own native map function (it didn't for a long time, thus the jQuery shim), and it's very similar to jQuery's. In fact, both Array.prototype.map() and Array.prototype.forEach() are very similar, with similar interfaces, just begin your invocation with the name of the array. So instead of jQuery $.map(data, notification => { return notification.template }), it's data.map(notification => notification.template) or similar. And the only difference between native map() and forEach() is that forEach() applies the function to each item in the array, while map() goes one step further and returns a new array of resulting values if invoked correctly.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach

How to Translate jQuery code into Vanilla JS, In your case you can convert $.map() to Array.map() , and convert the counter and the $.each() to an Array.reduce() call. often $.each() is� Browse other questions tagged javascript jquery parallax or ask your own question. The Overflow Blog The Overflow #23: Nerding out over a puzzle


Try this:

handleSuccess(data){
const items = data.map(notification => notification.template)

let unreadCount = items.reduce(( total, curr) => curr.unread ? total +=1 : total)

this.unreadCountTarget.innerHTML = unreadCount
this.itemsTarget.innerHTML = items
}

The last two lines of your code are unchanged.

Cheat sheet for moving from jQuery to vanilla JavaScript, Thankfully people smarter than me have already figured that out, so here's a function you can use: /** * Equivalent to jQuery's ready() function. jQuery( '#menu' ). document. var menus = new _lemon( '. var lemon = function( selector, parent ) { return new _lemon( selector, parent ); }; var menus = lemon( '. I need to be able to change the current JQuery Methods into Vanilla(regular) javascript parts. The full code can be found here (Edit fiddle - JSFiddle. Note the link is not spam, download, promoting, etc. It is simply displaying to a popular tool/IDE for webpage results that most IT/Coding sites use, especially for Web Design).


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Convert Jquery to vanilla js - Pub, This is the jQuery code, I want to convert to vanilla JS: // jQuery solution using event delegation for slideToggle $('#container').on('click',� A quick look into the code coverage for the CSS we translated jQuery code into plain JS to remove the Cheat sheet for moving from jQuery to vanilla JavaScript.


How to convert this jQuery snippet to vanilla JavaScript?, Without jQuery in Rails 5.1, we explore what it takes to convert your traditional jQuery code into vanilla Javascript methods. It shows common jquery functions/patterns and how to do them with vanilla JS. For example the $ function can be replaced with document.querySelectorAll and then manually loop through results. In your case since you're selecting IDs, document.getElementById('Input') will work best.