Ember.js ArrayProxy 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 is used to shift an object from the start of an array or nil if nothing is left.

Syntax:

shiftObject();

Parameters: It doesn’t take any parameters.

Return Value: It returns an object.

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 server

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

ember generate route shiftObject1

• app/routes/shiftObject1.js

Javascript

import Route from '@ember/routing/route';
export default class FruitsRoute extends Route {
    fruits = [
        {
            'name': 'Lady Finger',
            'isFruit': false,
            'color': 'green',
            'quant': 2,
        },
        {
            'name': 'Brinjal',
            'isFruit': false,
            'color': 'purple',
            'quant': 2,
        },
        {
            'name': 'Apple',
            'isFruit': true,
            'color': 'red',
            'quant': 5,
        },
        {
            'name': 'Grapes',
            'isFruit': true,
            'color': 'green',
            'quant': 4,
        },
        {
            'name': 'Mango',
            'isFruit': true,
            'color': 'yellow',
            'quant': 3,
        },
        {
            'name': 'Watermelon',
            'isFruit': true,
            'color': 'red',
            'quant': 2,
        },
        {
            'name': 'Orange',
            'isFruit': true,
            'color': 'orange',
            'quant': 2,
        },
        {
            'name': 'Banana',
            'isFruit': true,
            'color': 'yellow',
            'quant': 5,
        },
        {
            'name': 'Papaya',
            'isFruit': true,
            'color': 'orange',
            'quant': 5,
        },
    ];
    item2;
    item3;
    model(){
        return this.fruits;
    }
    setupController(controller,model) {
        super.setupController(controller, model);
        controller.set('fruits', this.fruits);
        controller.set('item1', this.item1);
        controller.set('item2', this.item2);
        controller.set('item3', this.item3);
    }
}

• app/controllers/shiftObject1.js

Javascript

import Ember from "ember";

export default Ember.Controller.extend({
actions: {
    show_Fruits( ) {
        let temp = this.fruits.rejectBy('isFruit',false);
        let foo = temp.mapBy('name');
        alert(foo.join('\n'))
    },
    slice_items( idx1, idx2) {
        let foo = this.fruits.slice(idx1, idx2);
        let ans = foo.mapBy('name')
        alert(ans.join('\n'))
    },
    remove() {
        this.fruits.shiftObject( );

    },
    set_quant(data) {
        this.fruits.setEach('quant', data );

    },
    select(){
        let temp = this.fruits.uniqBy('color');
        let ans = temp.mapBy('name');
        alert(ans.join('\n'));
    }
},
});

• app/templates/shiftObject1.hbs

Javascript

{{page-title "shiftObject"}}
<h3>Here is a list of eatables: </h3>
<table>
    <tr>
        <th>Name</th>
        <th>Fruit</th>
        <th>Color</th>
        <th>Quantity</th>
    </tr>
    {{#each @model as |detail|}}
    <tr>
        <td>{{detail.name}}</td>
        <td>{{detail.isFruit}}</td>
        <td>{{detail.color}}</td>
        <td>{{detail.quant}}</td>
    </tr>
    {{/each}}
</table>
<br /><br />
<div>
    <label>Enter first index: </label>
    {{input value=this.temp}}
</div>
<div>
    <label>Enter last indexs: </label>
    {{input value=this.temp2}}
</div>
<input
    type="button"
    id="check-atIndex"
    value="Slice list"
    {{action "slice_items" this.temp this.temp2}}
/>
<br/>
<br/>
<div>
    <label>Enter Quantity: </label>
    {{input value=this.temp3}}
</div>
<input
    type="button"
    id="set-quant"
    value="Set Each Quantity"
    {{action "set_quant" this.temp3}}
/>
<br/><br/>
<div>
    <input type="button"
    id="removeFruit"
    value="Remove 1's Fruit"
    {{action "remove" }}    >
</div>
<br/>
<div>
    <input type="button"
    id="addFruit"
    value="Show Fruit"
    {{action "show_Fruits"}}    >
</div>
<br/>
<input
    type="button"
    id="select-fruits"
    value="Select One item of Each color"
    {{action "select"}}
/>
{{outlet}}

Output: Visit localhost:4200/shiftObject1 to view the output

Ember.js ArrayProxy shiftObject method

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

ember generate route shiftObject2

• app/routes/shiftObject2.js

Javascript

import Route from "@ember/routing/route";

export default class StudentsRoute extends Route {
    students = [
        {
            name: "Aaush Somankar",
            gender: "M",
            class: 12,
            grade: "A",
            mobile: 7897391833,
        },
        {
            name: "Aman Prakash",
            gender: "M",
            class: 10,
            grade: "A",
            mobile: 8293839918,
        },
        {
            name: "Siya guru",
            gender: "F",
            class: 11,
            grade: "B",
            mobile: 6293839912,
        },
        {
            name: "Ramesh verma",
            gender: "M",
            class: 10,
            grade: "A",
            mobile: 7193839932,
        },
        {
            name: "Esnoor",
            gender: "M",
            class: 9,
            grade: "F",
            mobile: 8372819383,
        },
        {
            name: "Balit",
            gender: "M",
            class: 10,
            grade: "A",
            mobile: 7361927365,
        },
        {
            name: "Dora",
            gender: "F",
            class: 12,
            grade: "F",
            mobile: 5634152617,
        },
        {
            name: "Lalu",
            gender: "F",
            class: 8,
            grade: "A",
            mobile: 8372618392,
        },
        {
            name: "Pokhraj",
            gender: "M",
            class: 11,
            grade: "F",
            mobile: 9302810231,
        },
        {
            name: "Rahul",
            gender: "M",
            class: 9,
            grade: "A",
            mobile: 7837919373,

        },
        {
            name: "Ram",
            gender: "M",
            class: 12,
            grade: "A",
            mobile: 8272112539,
        },
        {
            name: "Priti",
            gender: "F",
            class: 9,
            grade: "F",
            mobile: 8836172912,
        },
        {
            name: "Sita",
            gender: "F",
            class: 8,
            grade: "A",
            mobile: 9193830293,
        },
    ];
  convert(string) {
    this.item = string.split(",").map((item) => item.trim());
    return this.item;
}

    model() {
        return this.students;
    }
    setupController(controller, model) {
        super.setupController(controller, model);
        controller.set("students", this.students);
    controller.set("convert", this.convert);
    controller.set("item", this.item);
    }
}

• app/controllers/shiftObject2.js

Javascript

import Ember from "ember";

export default Ember.Controller.extend({
    actions: {
        select(){
            let temp = this.students.uniqBy('class');
            let ans = temp.mapBy('name')
            alert(ans.join('\n'))
        },
        hide() {
            this.students.setEach('mobile','**********')
              },
        allPass() {
            let tempItems = this.students.rejectBy('grade','F');
            let ans = tempItems.mapBy('name')
            alert(ans.join('\n'))

        },
        remove() {
        this.students.shiftObject();
        },
        check_item(idx) {
            let temp = this.students.objectAt(JSON.parse(idx));
            alert(temp.name)
        },
    check_items(idx1, idx2) {
      let temp = this.students.slice(idx1, idx2);
      let ans = temp.mapBy('name')
      alert(ans.join('\n'))
        },
    },
});

• app/templates/shiftObject2.hbs

Javascript

{{page-title "shiftObject"}}
<h3>List of Students: </h3>

<table>
    <tr>
        <th>Name</th>
        <th>Class</th>
        <th>Gender</th>
        <th>Grade</th>
        <th>Mobile No.</th>
    </tr>
    {{#each @model as |student|}}
    <tr>
        <td>{{student.name}}</td>
        <td>{{student.class}}</td>
        <td>{{student.gender}}</td>
        <td>{{student.grade}}</td>
        <td>{{student.mobile}}</td>
    </tr>
    {{/each}}
</table>
<br /><br />
<div>
    <label>Enter first index: </label>
    {{input value=this.temp}}
</div>
<div>
    <label>Enter last indexs: </label>
    {{input value=this.temp2}}
</div>
<input
    type="button"
    id="check-atIndex"
    value="Slice list"
    {{action "check_items" this.temp this.temp2}}
/>
<br /><br />
<input
    type="button"
    id="remove-last"
    value="Remove First Student"
    {{action "remove"}}
/>
<br /><br />
<input
    type="button"
    id="hide-number"
    value="Hide Mobile Numbers"
    {{action "hide"}}
/>
<br /><br />
<input
    type="button"
    id="all-pass"
    value="Show All Passed Students"
    {{action "allPass"}}
/>

<br /><br />
<input
    type="button"
    id="select-student"
    value="Select One Student Of Each class"
    {{action "select"}}
/>
{{outlet}}

Output: Visit localhost:4200/shiftObject2 to view the output

Ember.js ArrayProxy shiftObject method

Reference: https://api.emberjs.com/ember/2.14/classes/Ember.Array/methods/shiftObject?anchor=shiftObject