Ember.js Ember.NativeArray map() 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 map() method is used to map all items in the array with a specific function.

Syntax:

map(callback, target)

Parameters:

• callback: The callback function to execute.
• target: The target object to use.

Return Value: The mapped array.

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 details

app/routes/details.js

Javascript

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

export default class DetailsRoute extends Route {
   details = [
       {
           name: "Anubhav",
           mobile: "1298119967",
           age: 20,
           salary: 10000,
           city: "Patna",
           country: "India",
           gender: "M",
           zipCode: "800020",
       },
       {
           name: "Sakshi",
           mobile: "1234567890",
           age: 17,
           salary: 2000,
           city: "Mumbai",
           country: "India",
           gender: "F",
           zipCode: "400001",
       },
       {
           name: "Satyam",
           mobile: "2222222222",
           age: 42,
           salary: 230000,
           city: "Delhi",
           country: "India",
           gender: "M",
           zipCode: "110012",
       },
       {
           name: "Shivam",
           mobile: "1122113322",
           age: 33,
           salary: 122200,
           city: "Patna",
           country: "India",
           gender: "M",
           zipCode: "530068",
       },
       {
           name: "Ayushi",
           mobile: "2244668800",
           age: 11,
           salary: 100,
           city: "Jaipur",
           country: "India",
           gender: "F",
           zipCode: "302001",
       },
       {
           name: "Yeshwant",
           mobile: "1133557799",
           age: 19,
           salary: 5000,
           city: "Chennai",
           country: "India",
           gender: "M",
           zipCode: "600001",
       },
       {
           name: "Siddhant",
           mobile: "9911000000",
           age: 65,
           salary: 992130,
           city: "Mangalore",
           country: "India",
           gender: "M",
           zipCode: "574142",
       },
       {
           name: "Khushi",
           mobile: "8888888888",
           age: 10,
           salary: 0,
           city: "Pune",
           country: "India",
           gender: "F",
           zipCode: "111045",
       },
   ];
   model() {
       return this.details;
   }
   setupController(controller, model) {
       super.setupController(controller, model);
       controller.set("details", this.details);
   }
}

app/controllers/details.js

Javascript

import Ember from "ember";
import { any, slice, reverseObjects, rejectBy }
from "@ember/array";

export default Ember.Controller.extend({
   actions: {
       getAllNames() {
           let tempItems = this.details.getEach("name");
           let str = "";
           for (let i = 0; i < tempItems.length; i++)
               str += tempItems[i] + "\n";
           alert(str);
       },
       allAdult() {
           let res = this.details.every((person) =>
               person.age > 18);
           alert(`${res ? "YES" : "NO"}`);
       },
       getFemale() {
           let tempItems = this.details.filter((person) =>
               person.gender === "F");
           let str = "";
           for (let i = 0; i < tempItems.length; i++)
               str += tempItems[i].name + "\n";
           alert(str);
       },
       increaseSalary() {
           this.details.forEach((person) =>
               Ember.set(person, "salary",
                person.salary + 1000)
           );
       },
       hideNumber() {
           this.details.map((person) =>
               Ember.set(person, "mobile", "**********"));
       },
       clearAll() {
           this.details.clear();
       },
   },
});

app/template/details.hbs

HTML

{{page-title "Details"}}
<h3>List of People: </h3>
<br /><br />
<table>
    <tr>
        <th>Name</th>
        <th>Gender</th>
        <th>Age</th>
        <th>Salary</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.age}}</td>
        <td>{{detail.salary}}</td>
        <td>{{detail.mobile}}</td>
        <td>{{detail.city}}</td>
        <td>{{detail.country}}</td>
        <td>{{detail.zipCode}}</td>
    </tr>
    {{/each}}
</table>
<br /><br />
<input type="button" id="get-all"
    value="Get All Names"
    {{action "getAllNames" }} />
<br /><br />
<input type="button" id="get-all-adult"
    value="Is there only adult?"
    {{action "allAdult" }} />
<br /><br />
<input type="button" id="get-female"
    value="Get Female"
    {{action "getFemale" }} />
<br /><br />
<input type="button"
    id="increase-salary"
    value="Increase Salary"
    {{action "increaseSalary" }} />
<br /><br />
<input type="button"
    id="hide-number"
    value="Hide Number"
    {{action "hideNumber" }} />
<br /><br />
<input type="button"
    id="clear-all"
    value="Clear"
    {{action "clearAll" }} />

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

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

ember generate route students

app/routes/students.js

Javascript

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

export default class StudentsRoute extends Route {
   students = [
       {
           name: "Alix Mainston",
           gender: "F",
           class: 9,
           grade: "B",
           pocket_money: 9643,
       },
       {
           name: "Mufinella Lezemore",
           gender: "F",
           class: 10,
           grade: "A",
           pocket_money: 6960,
       },
       {
           name: "Sibylla Hanbridge",
           gender: "F",
           class: 8,
           grade: "D",
           pocket_money: 2272,
       },
       {
           name: "Wilow Lingwood",
           gender: "F",
           class: 8,
           grade: "A",
           pocket_money: 4279,
       },
       {
           name: "Estele MacIllrick",
           gender: "M",
           class: 9,
           grade: "E",
           pocket_money: 2579,
       },
       {
           name: "Israel Blackaller",
           gender: "M",
           class: 10,
           grade: "A",
           pocket_money: 9381,
       },
       {
           name: "Doralyn Sowerbutts",
           gender: "F",
           class: 12,
           grade: "A",
           pocket_money: 4933,
       },
       {
           name: "Lolly Boynes",
           gender: "F",
           class: 8,
           grade: "A",
           pocket_money: 1988,
       },
       {
           name: "Lucie Janowski",
           gender: "F",
           class: 11,
           grade: "F",
           pocket_money: 6185,
       },
       {
           name: "Camilla Ritelli",
           gender: "Bigender",
           class: 9,
           grade: "C",
           pocket_money: 1105,
       },
       {
           name: "Celene Enticknap",
           gender: "F",
           class: 9,
           grade: "A",
           pocket_money: 7186,
       },
       {
           name: "Hillier Buchanan",
           gender: "M",
           class: 12,
           grade: "A",
           pocket_money: 844,
       },
       {
           name: "Afton Povey",
           gender: "F",
           class: 9,
           grade: "F",
           pocket_money: 6633,
       },
       {
           name: "Flint Chesley",
           gender: "M",
           class: 9,
           grade: "B",
           pocket_money: 3835,
       },
       {
           name: "Sigfrid Copper",
           gender: "M",
           class: 8,
           grade: "D",
           pocket_money: 3883,
       },
       {
           name: "Barry Donnelly",
           gender: "M",
           class: 12,
           grade: "C",
           pocket_money: 4521,
       },
       {
           name: "Buck Polgreen",
           gender: "M",
           class: 8,
           grade: "C",
           pocket_money: 553,
       },
   ];
   model() {
       return this.students;
   }
   setupController(controller, model) {
       super.setupController(controller, model);
       controller.set("students", this.students);
   }
}

app/controllers/students.js

Javascript

import Ember from "ember";

export default Ember.Controller.extend({
   actions: {
       getAllNames() {
           let tempItems = this.students.getEach("name");
           let str = "";
           for (let i = 0; i < tempItems.length; i++)
               str += tempItems[i] + "\n";
           alert(str);
       },
       allPass() {
           let res = this.students.every((student) =>
               student.grade != "F");
           alert(`${res ? "YES" : "NO"}`);
       },
       getFemale() {
           let tempItems = this.students.filter((student) =>
               student.gender === "F");
           let str = "";
           for (let i = 0; i < tempItems.length; i++)
               str += tempItems[i].name + "\n";
           alert(str);
       },
       changeGrade() {
           this.students.forEach((student) =>
               Ember.set(student, "grade", "A"));
       },
       increasePocketMoney() {
           this.students.map((student) =>
               Ember.set(student, "pocket_money",
                   student.pocket_money + 1000)
           );
       },
   },
});

app/template/students.hbs

HTML

{{page-title "Students"}}
<h3>List of Students: </h3>
<br /><br />
<table>
    <tr>
        <th>Name</th>
        <th>Class</th>
        <th>Gender</th>
        <th>Grade</th>
        <th>Pocket Money</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.pocket_money}}</td>
    </tr>
    {{/each}}
</table>
<br /><br />
<input type="button" id="get-all"
    value="Get All Names"
    {{action "getAllNames" }} />
<br /><br />
<input type="button" id="all-pass"
    value="Did Everyone Pass?"
    {{action "allPass" }} />
<br /><br />
<input type="button" id="get-female"
    value="Get Female"
    {{action "getFemale" }} />
<br /><br />
<input type="button"
    id="increase-pocket-money"
    value="Increase Pocket Money"
    {{action "increasePocketMoney" }} />
<br /><br />
<input type="button" id="change-grade"
    value="Change Grade"
    {{action "changeGrade" }} />

{{outlet}}

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

Reference: https://api.emberjs.com/ember/4.6/classes/Ember.NativeArray/methods?anchor=map