with vs let

components.with-vs-let.js

import Ember from 'ember';

export default Ember.Component.extend({
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

templates.application.hbs

{{with-vs-let}}

templates.components.with-vs-let.hbs

<h1>\{{with}} vs \{{let}}</h1>

<button onclick={{action (mut showThing) true}}>Show</button>
<button onclick={{action (mut showThing) false}}>Hide</button>

<h3>With:</h3>

{{#with showThing as |isShowing|}}
	showThing: {{showThing}}
{{else}}
	not showing...
{{/with}}

<h3>Let:</h3>

{{#let showThing as |isShowing|}}
	showThing: {{isShowing}}
{{/let}}

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}