{{ unbound val }}

npm install ember-cli

ember new <project-name> --lang en

ember serve

ember generate route unbound1

import Component from '@glimmer/component';
import { action, set } from '@ember/object';
import { tracked } from '@glimmer/tracking';
import Ember from 'ember';
 
export default class ListComponent extends Component {
    @tracked
    value = 'GeeksforGeeks';
    @action
    change(data) {
        this.value = "GFG";
    }
}

<h2>{{unbound this.value}} is not changeable.</h2>
<h2>{{this.value}} is changeable.</h2>
 
<input type="button"
    id="set-code"
    value="Change value"
    {{action 'change' 'GFG'}}/>

{{page-title "List2"}}
<List2 @value={{ this.val }}>
</List2>

ember generate route unbound2

import Component from '@glimmer/component';
import { tracked } from '@glimmer/tracking';
import { action } from '@ember/object';
import { mapBy } from '@ember/object';
 
export default class extends Component {
    @tracked
    value = 'name';
 
    @tracked
    value2 = 'c++';
    student = [
        {
            name: 'Sam Snehil',
            age: 21,
            skill: 'Python',
        },
        {
            name: 'Satyam Sahu',
            age: 23,
            skill: 'JavaScript',
        },
        {
            name: 'Sohan Argrwal',
            age: 25,
            skill: 'Html',
        },
        {
            name: 'Sreya Sarma',
            age: 19,
            skill: 'PHP',
        },
        {
            name: 'Satyam Sahu',
            skill: 'Angular',
        },
    ];
 
    @action
    print(data1, data2) {
        this.student.setEach(data1, data2);
    }
}

**app/components/arr2.hbs**

##  HTML 

{{yield}}
<table>
    <tr>
        <th>Name</th>
        <th>Age</th>
        <th>skill</th>
    </tr>
      {{#each this.student as |detail|}}
 
    {{#if detail.age}}
            <tr>
            <td>{{unbound (get detail 'name')}}</td>
            <td>{{get detail 'age'}}</td>
            <td>{{get detail 'skill'}}</td>
        </tr>
    {{else}}
    <tr>
            <td>{{unbound (get detail 'name')}}</td>
            <td>{{18}}</td>
            <td>{{get detail 'skill'}}</td>
        </tr>
    {{/if}}
    {{/each}}
</table>
<br/>
{{textarea value=this.value}}
 
{{textarea value=this.value2}}
<br/>
<input type="button"
    id="set-code"
    value="Update Student details"
    {{action 'print' this.value this.value2}}/>

<Arr2>
    <h1>
        List of Student : 
    </h1>
</Arr2>
{{outlet}}