Ember.js Ember.NativeArray shiftObject() Method

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 shiftObject() method shifts nil, if there are no more,  or an object from the array’s beginning.

Syntax:

shiftObject()

Parameters: It doesn’t take any parameters.

Return Value: The shifted object.

Steps to Install and Run Ember.js:

Step 1: 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

Step 2: 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 fruits

app/routes/fruits.js

import Route from "@ember/routing/route";
import { } from "@ember/array";

export default class FruitsRoute extends Route {
    fruits = [
        {
            name: "Lady Finger",
            isFruit: false,
            color: "green",
        },
        {
            name: "Brinjal",
            isFruit: false,
            color: "purple",
        },
        {
            name: "Apple",
            isFruit: true,
            color: "red",
        },
        {
            name: "Grapes",
            isFruit: true,
            color: "green",
        },
        {
            name: "Mango",
            isFruit: true,
            color: "yellow",
        },
        {
            name: "Watermelon",
            isFruit: true,
            color: "red",
        },
        {
            name: "Orange",
            isFruit: true,
            color: "orange",
        },
    ];
    model() {
        return this.fruits;
    }
    setupController(controller, model) {
        super.setupController(controller, model);
        controller.set("fruits", this.fruits);
    }
}

app/controllers/fruits.js

import Ember from "ember";
import { shiftObject, isAny, isEvery } from "@ember/array";

export default Ember.Controller.extend({
    actions: {
        removeFruit() {
            this.fruits.shiftObject();
        },
        anyFruit() {
            alert(`${this.fruits.isAny("isFruit") ? "Yes" : "No"}`);
        },
        allFruit() {
            alert(`${this.fruits.isEvery("isFruit") ? "Yes" : "No"}`);
        },
    },
});

app/template/fruits.hbs

{{page-title "Fruits"}}
<h3>Here is a list of eatables: </h3>
<ul>
    {{#each @model as |eatable|}}
        <li style="color: {{eatable.color}}">
            {{eatable.name}}
         </li>
      {{/each}}
</ul>
<br /><br />
<input
    type="button"
      id="remove-eatable"
      value="Remove Eatable"
      {{action "removeEatable"}}
/>
<br /><br />
<input
    type="button"
      id="fruit-any"
      value="List Contains Any Fruit?"
      {{action "anyFruit"}}
/>
<br /><br />
<input
    type="button"
      id="fruit-all"
      value="List Contains Only Fruit?"
      {{action "allFruit"}}
/>
{{outlet}}

Output: Visit localhost:4200/fruits 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'
        }
    ];
    city;
    code;
    model() {
        return this.details;
    }
    setupController(controller, model) {
        this._super(controller, model);
        controller.set('details', this.details);
        controller.set('someMoreDetails', this.someMoreDetails);
        controller.set('city', this.city);
        controller.set('code', this.code);
    }
}

app/controllers/details.js

import Ember from "ember";
import { pushObjects, shiftObject, setEach } from "@ember/array";

export default Ember.Controller.extend({
    actions: {
        checkCity(city) {
            alert(`Contains Person from ${city}:
            ${this.details.isAny("city", city) ? "Yes" : "No"}`);
        },
        checkCountry() {
            alert(`All are ${this.details
                .isEvery("country", "India") ? "" : "not"}
             Indian`);
        },
        remove() {
            this.details.shiftObject();
        },
        setZipCode(code) {
            this.details.setEach("zipCode", code);
        },
        pushMoreDetails() {
            this.details.pushObjects(this.someMoreDetails);
        },
    },
});

app/template/details.hbs

{{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 City: </label>
    {{input value=this.city}}
</div>
<div>
    <input
        type="button"
        id="check-city"
        value="Check City"
        {{action "checkCity" this.city}}
      />
</div>
<br /><br />
<div>
    <label>Enter Code: </label>
      {{input value=this.code}}
</div>
<div>
    <input
        type="button"
        id="set-code"
        value="Set Zip Code"
        {{action "setZipCode" this.code}}
      />
</div>
<br /><br />
<input type="button" id="remove-detail" value="Remove"
    {{action "remove"}} />
<br /><br />
<input
    type="button"
      id="push-details"
      value="Add More Details"
      {{action "pushMoreDetails"}}
/>
<br /><br />
<input
    type="button"
      id="check-country"
      value="All Indian?"
      {{action "checkCountry"}}
/>
{{outlet}}

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

Reference: https://api.emberjs.com/ember/4.6/classes/Ember.NativeArray/methods