Open In App

Ember.js MutableArray objectAt() Method

Improve
Improve
Like Article
Like
Save
Share
Report

Ember.js is an open-source JavaScript framework used for developing large client-side web applications which is based on Model-View-Controller (MVC) architecture. Ember.js is one of the most widely used front-end application frameworks. It is made to speed up development and increase productivity. Currently, it is utilized by a large number of websites, including Square, Discourse, Groupon, Linked In, Live Nation, Twitch, and Chipotle.

The objectAt() method is used to retrieve the object at a given index.

Syntax:

objectAt(index)

Parameters:

  • index: Index of the element.

Return Value: The required object.

To run the following examples you will need to have an ember project with you. To create one, you will need to install ember-cli first. Write the below code in the terminal:

npm install ember-cli

Now you can create the project by typing in the following piece of code:

ember new <project-name> --lang en

To start the server, type:

ember serve

Example 1: Type the following code to generate the route for this example:

ember generate route party

app/routes/party.js




import Route from '@ember/routing/route';
  
export default class PartyRoute extends Route {
    partyItems = [
        'Digital Camera',
        'Jugs, cups & straws',
        'Balloons',
        'Scissors',
        'Cold Drink',
        'Table Confetti',
        'Party Hats',
        'Wine',
        'Napkins',
        'Party Plates',
        'Speakers',
        'Music System',
        'Cups',
    ];
    item;
    itemString;
    itemList;
    start;
    end;
    idx;
    model() {
        return this.partyItems;
    }
    setupController(controller, model) {
        this._super(controller, model);
        controller.set('partyItems', this.partyItems);
        controller.set('item', this.item);
        controller.set('itemString', this.itemString);
        controller.set('itemList', this.itemList);
        controller.set('start', this.start);
        controller.set('end', this.end);
        controller.set('idx', this.idx);
    }
}


app/controllers/party.js




import Ember from 'ember';
import { without, toArray, unshiftObject, unshiftObjects,
        removeAt, objectAt, find, replace, uniq } from '@ember/array';
  
export default Ember.Controller.extend({
    actions: {
        withoutItem(item) {
            console.log(item)
            let tempItems;
            tempItems = this.partyItems.without(item);
            let str = '';
            for (let i = 0; i < tempItems.length;i++)
                str += tempItems[i] + '\n';
            alert(str);
            this.set('item', '');
        },
        addItems(itemString) {
            this.itemList = itemString.split(',').toArray();
            if (this.itemList.length == 1)
                this.partyItems.unshiftObject(this.itemList[0]);
            else
                this.partyItems.unshiftObjects(this.itemList);
            this.set('itemString', '');
        },
        removeItems(start, end) {
            this.partyItems.removeAt(start, end);
        },
        getObject(idx) {
            alert(`The item at index ${idx} is 
            ${this.partyItems.objectAt(idx)}`);
        },
        findMultipleWordItems() {
            let reqItem = this.partyItems.find((item) => 
                          item.split(' ').toArray().length > 1);
                            alert(reqItem);
        },
        replaceItem(itemString) {
            this.itemList = itemString.split(',').toArray();
            if (this.itemList.length > this.partyItems.length)
                alert('Error');
            this.partyItems.replace(0, 
                this.itemList.length, this.itemList);
        },
        getUniqueItems() {
            let tempItems = this.partyItems.uniq();
            let str = '';
            for (let i = 0; i < tempItems.length;i++)
                str += tempItems[i] + '\n';
            alert(str);
            this.set('item', '');
        },
    },
});


app/template/party.js




{{page-title "Party"}}
<h3>Here is a list of items: </h3>
<ul>
    {{#each @model as |party|}}
    <li>{{party}}</li>
    {{/each}}
</ul>
<br /><br />
<div>
    <label>Enter Item: </label>
    {{input value=this.item}}
</div>
<div>
    <input type="button" id="remove-item" 
           value="Remove Item" 
           {{action 'withoutItem' this.item}} />
</div>
<br /><br />
<div>
    <label>Enter Items: </label>
    {{input value=this.itemString}}
</div>
<div>
    <input type="button" id="add-item" 
           value="Add Items"
           {{action 'addItems' this.itemString}} />
</div>
<br /><br />
<div>
    <label>Enter Start Index: </label>
    {{input value=this.start}}
</div>
<div>
    <label>Enter End Index: </label>
    {{input value=this.end}}
</div>
<div>
    <input type="button" id="remove-items" 
           value="Remove Items" 
           {{action 'removeItems' this.start this.end}} />
</div>
<br /><br />
<div>
    <label>Enter Index: </label>
    {{input value=this.idx}}
</div>
<div>
    <input type="button" id="get-item" value="Get Item" 
           {{action 'getObject' this.idx}} />
</div>
<br /><br />
<div>
    <label>Enter Items: </label>
    {{input value=this.itemString}}
</div>
<div>
    <input type="button" id="replace-item" 
           value="Replace Items" 
           {{action 'replaceItem' this.itemString}} />
</div>
<br /><br />
<input type="button" id="get-multiword" 
       value="Get Multiword Items!"
       {{action 'findMultipleWordItems' }} />
<br /><br />
<input type="button" id="get-unique" 
       value="Get Unique Items!" 
       {{action 'getUniqueItems' }} />
{{outlet}}


Output: Visit localhost:4200/party to view the output

 

Example 2: Type the following code to generate the route for this example:

ember generate route details

app/routes/details.js




import Route from '@ember/routing/route';
  
export default class DetailsRoute extends Route {
  details = [
    {
      name: 'Anubhav',
      mobile: '1298119967',
      city: 'Patna',
      country: 'India',
      gender: 'M',
      zipCode: '800020',
    },
    {
      name: 'Sakshi',
      mobile: '1234567890',
      city: 'Mumbai',
      country: 'India',
      gender: 'F',
      zipCode: '400001',
    },
    {
      name: 'Satyam',
      mobile: '2222222222',
      city: 'Delhi',
      country: 'India',
      gender: 'M',
      zipCode: '110012',
    },
    {
      name: 'Shivam',
      mobile: '1122113322',
      city: 'Bangalore',
      country: 'India',
      gender: 'M',
      zipCode: '530068',
    },
    {
      name: 'Ayushi',
      mobile: '2244668800',
      city: 'Jaipur',
      country: 'India',
      gender: 'F',
      zipCode: '302001',
    },
  ];
  someMoreDetails = [
    {
      name: 'Yeshwant',
      mobile: '1133557799',
      city: 'Chennai',
      country: 'India',
      gender: 'M',
      zipCode: '600001',
    },
    {
      name: 'Siddhant',
      mobile: '9911000000',
      city: 'Mangalore',
      country: 'India',
      gender: 'M',
      zipCode: '574142',
    },
    {
      name: 'Khushi',
      mobile: '8888888888',
      city: 'Pune',
      country: 'India',
      gender: 'F',
      zipCode: '111045',
    },
  ];
  start;
  end;
  idx;
  model() {
    return this.details;
  }
  setupController(controller, model) {
    super.setupController(controller, model);
    controller.set('details', this.details);
    controller.set('someMoreDetails'
        this.someMoreDetails);
    controller.set('start', this.start);
    controller.set('end', this.end);
    controller.set('idx', this.idx);
  }
}


app/controllers/details.js




import Ember from 'ember';
import { removeAt, unshiftObjects, objectAt,
         uniqBy, find } from '@ember/array';
  
export default Ember.Controller.extend({
  actions: {
    removeDetails(start,end) {
      this.details.removeAt(start,end);
    },
    addMoreDetails() {
      this.details.unshiftObjects(this.someMoreDetails);
    },
    getDetail(index) {
      let foo = this.details.objectAt(index);
      alert(foo.name);
    },
    getFirstMaleAndFemalePerson() {
      let foo = this.details.uniqBy('gender').toArray();
      let str = "";
      for (let i = 0; i < foo.length; i++)
        str += foo[i].name + "\n";
      alert(str);
    },
    getFirstMale() {
      let foo = this.details.find(
          (detail) => detail.gender === 'M');
      alert(foo.name);
    },
  },
});


app/template/details.js




{{page-title "Details"}}
<h3>List of People: </h3>
<br /><br />
<table>
    <tr>
        <th>Name</th>
        <th>Gender</th>
        <th>Mobile</th>
        <th>City</th>
        <th>Country</th>
        <th>Zip Code</th>
    </tr>
    {{#each @model as |detail|}}
    <tr>
        <td>{{detail.name}}</td>
        <td>{{detail.gender}}</td>
        <td>{{detail.mobile}}</td>
        <td>{{detail.city}}</td>
        <td>{{detail.country}}</td>
        <td>{{detail.zipCode}}</td>
    </tr>
    {{/each}}
</table>
  
<br /><br />
<div>
    <label>Enter Start Index: </label>
    {{input value=this.start}}
</div>
<div>
    <label>Enter End Index: </label>
    {{input value=this.end}}
</div>
<div>
    <input type="button" id="remove-details" 
           value="Remove Details" 
           {{action 'removeDetails' this.start this.end}} />
</div>
<br /><br />
<div>
    <label>Enter Index: </label>
    {{input value=this.idx}}
</div>
<div>
    <input type="button" id="get-detail" 
           value="Get detail" 
           {{action 'getDetail' this.idx}} />
</div>
<br /><br />
<input type="button" id="add-details" 
       value="Add More Details" 
       {{action 'addMoreDetails' }} />
<br /><br />
<input type="button" id="all-male" 
       value="Get First Male" 
       {{action 'getFirstMale' }} />
<br /><br />
<input type="button" id="get" value="Get" 
       {{action 'getFirstMaleAndFemalePerson' }} />
{{outlet}}


Output: Visit localhost:4200/details to view the output

 

Reference: https://api.emberjs.com/ember/4.4/classes/MutableArray/methods



Last Updated : 16 Aug, 2022
Like Article
Save Article
Previous
Next
Share your thoughts in the comments
Similar Reads