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Ember.js Ember.NativeArray removeAt() Method

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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 removeAt() method is used to remove elements on a given index.

Syntax:

removeAt(start, len)

 

Parameters:

  • start: Starting index.
  • len: Length of the elements to be removed.

Return Value: Nothing

Steps to Install and Run Ember.js:

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

Javascript




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

Javascript




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.hbs

HTML




{{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

Javascript




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

Javascript




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.hbs

HTML




{{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/4.6/classes/Ember.NativeArray/methods



Last Updated : 10 Oct, 2022
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