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 the items in the enumeration to another value.
Syntax:
map( callback, target );
Parameters:
- callback: It is the callback that is executed on each item.
- target: It is the target item on which the callback function will perform.
Return Value: A mapped array.
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 map1
import Route from '@ember/routing/route' ;
export default class WebsitesRoute
extends Route {
food = [
{
food: 'apple' ,
quant: 1.5,
Bucket: 1,
},
{
food: 'Potato' ,
quant: 3,
Bucket: 2,
},
{
food: 'Banana' ,
quant: 2,
Bucket: 1,
},
{
food: 'grapes' ,
quant: 3,
Bucket: 2,
},
{
food: 'Orange' ,
quant: 2,
Bucket: 1,
},
{
food: 'Pine-apple' ,
quant: 1,
Bucket: 2,
},
{
food: 'bean' ,
quant: 3,
Bucket: 2,
},
];
temp;
model() {
return this .food;
}
setupController(controller, model) {
super .setupController(controller, model);
controller.set( 'food' , this .food);
controller.set( 'temp' , this .temp);
controller.set( 'temp2' , this .temp2);
}
} |
import Ember from 'ember' ;
import { map } from '@ember/array' ;
export default Ember.Controller.extend({
actions: {
increase_quant(data) {
this .food.map((item) =>
Ember.set(item, 'quant' ,
(item.quant) + +data));
},
shift_bucket() {
this .food.map((item) =>
Ember.set(item, 'Bucket' ,
item.Bucket == 1
? 2 : 1));
},
},
}); |
{{page-title "invoke" }}
<h2>List of Item with Quantity </h2>
<table> <tr>
<th>Name</th>
<th>Quantity</th>
<th>Bucket</th>
</tr>
{{ #each @model as |Eatable|}}
<tr>
<td>{{Eatable.food}}</td>
<td>{{Eatable.quant}}</td>
<td>{{Eatable.Bucket}}</td>
</tr>
{{/each}}
</table> <br /> <div> <label>Enter quantity: </label>
{{input value= this .qut}}
</div> <input type= "button"
id= "greet"
value= "Increase_quant"
{{action "increase_quant" this .qut}}
/> <br /><br /> <input type= "button"
id= "greet"
value= "Shift Bucket"
{{action "shift_bucket" }}
/> {{outlet}} |
Output: Visit localhost:4200/map1 to view the output
Example 2: Type the following code to generate the route for this example:
ember generate route mapBy2
import Route from '@ember/routing/route' ;
export default class StudentsRoute extends Route {
students = [
{
name: 'Aakash' ,
gender: 'M' ,
class: 10,
grade: 'A' ,
},
{
name: 'Soniya' ,
gender: 'F' ,
class: 8,
grade: 'C' ,
},
{
name: 'Sita' ,
gender: 'F' ,
class: 10,
grade: 'A' ,
},
{
name: 'Ram' ,
gender: 'M' ,
class: 10,
grade: 'A' ,
},
{
name: 'Esnoor' ,
gender: 'M' ,
class: 9,
grade: 'C' ,
},
{
name: 'Isha' ,
gender: 'F' ,
class: 19,
grade: 'B' ,
},
{
name: 'Doman' ,
gender: 'M' ,
class: 12,
grade: 'B' ,
},
{
name: 'Lolu' ,
gender: 'M' ,
class: 10,
grade: 'A' ,
},
{
name: 'Lucky' ,
gender: 'M' ,
class: 11,
grade: 'F' ,
},
{
name: 'Neha' ,
gender: 'F' ,
class: 10,
grade: 'B' ,
},
{
name: 'Balit' ,
gender: 'M' ,
class: 12,
grade: 'F' ,
},
{
name: 'Hillier Buchanan' ,
gender: 'M' ,
class: 12,
grade: 'A' ,
},
{
name: 'Aman' ,
gender: 'M' ,
class: 11,
grade: 'B' ,
},
{
name: 'Anuj' ,
gender: 'M' ,
class: 12,
grade: 'F' ,
},
{
name: 'Satyam' ,
gender: 'M' ,
class: 12,
grade: 'F' ,
},
{
name: 'Aayush' ,
gender: 'M' ,
class: 12,
grade: 'C' ,
},
];
temp2;
model() {
return this .students;
}
setupController(controller, model) {
super .setupController(controller, model);
controller.set( 'students' , this .students);
controller.set( 'temp2' , this .temp2);
}
} |
import Ember from "ember" ;
import { filter } from "@ember/array" ;
export default Ember.Controller.extend({
actions: {
allPass() {
let ans = '' ;
let temp = this .students.map((item) =>
item.grade == 'F' ? ans += item.name
+ '\n' : '' );
alert(ans);
},
allFemale() {
let ans = '' ;
let temp = this .students.map((item)
=> item.gender == 'F' ?
ans += item.name + '\n' : '' );
alert(ans);
},
allClass(data) {
let ans = '' ;
let temp = this .students.filter((item) =>
item.class == JSON.parse(data) ?
ans += item.name + '\n' : '' );
alert(ans);
},
}
}); |
{{page-title "Students" }}
<h3>List of Students: </h3> <br /><br /> <table> <tr>
<th>Name</th>
<th>Class</th>
<th>Gender</th>
<th>Grade</th>
</tr>
{{ #each @model as |student|}}
<tr>
<td>{{student.name}}</td>
<td>{{student.class}}</td>
<td>{{student.gender}}</td>
<td>{{student.grade}}</td>
</tr>
{{/each}}
</table> <br /> <input type= "button"
id= "all-pass"
value= "Failed Student"
{{action "allPass" }}
/> <br /><br /> <input type= "button"
id= "all-female"
value= "All are Female"
{{action "allFemale" }}
/> <br /><br /> <div> <label>Enter Class: </label>
{{input value= this .temp2}}
</div> <br /> <input type= "button"
id= "all-class"
value= "All are in Same class"
{{action "allClass" this .temp2}}
/> {{outlet}} |
Output: Visit localhost:4200/map2 to view the output
Reference: https://api.emberjs.com/ember/2.14/classes/Ember.Array/methods/map?anchor=map