Ember.js EmberArray reduce() Method
Last Updated :
18 Jan, 2023
Ember.js is an open-source JavaScript framework used for developing large client-side web applications which are 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 reduce() method is used to combine the enumerator into a single value. It is a useful way of collecting the summary value from the enumerators.
Syntax:
reduce( callback, initialValue, reducerProperty );
Parameters:
- callback: It is the callback that will execute on each function.
- initialValue: It is the initial value for the reducer.
- reducerProperty: It is for internal use only.
Return Value: A reduced value.
Steps to Install and Rub Ember.js Code:
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 reduce1
app/routes/reduce1.js
import Route from '@ember/routing/route' ;
export default class DetailsRoute
extends Route {
details = [
{
name: 'Aaksh' ,
mobile: '9811129967' ,
city: 'Delhi' ,
country: 'India' ,
gender: 'M' ,
zipCode: '800020' ,
},
{
name: 'Sweta' ,
mobile: '9456712890' ,
city: 'Mumbai' ,
country: 'India' ,
gender: 'F' ,
zipCode: '400001' ,
},
{
name: 'Satyam' ,
mobile: '2222222222' ,
city: 'Raipur' ,
country: 'India' ,
gender: 'M' ,
zipCode: '110012' ,
},
{
name: 'Shandya' ,
mobile: '1122113322' ,
city: 'Bangalore' ,
country: 'India' ,
gender: 'F' ,
zipCode: '530068' ,
},
{
name: 'Ayushi' ,
mobile: '2244668800' ,
city: 'Thana' ,
country: 'India' ,
gender: 'F' ,
zipCode: '302001' ,
},
];
someMoreDetails = [
{
name: 'Yogesh' ,
mobile: '1133557799' ,
city: 'Chennai' ,
country: 'India' ,
gender: 'F' ,
zipCode: '600001' ,
},
{
name: 'Sunny' ,
mobile: '9911000000' ,
city: 'Mysore' ,
country: 'India' ,
gender: 'M' ,
zipCode: '574142' ,
},
{
name: 'Khushi' ,
mobile: '8888888888' ,
city: 'Pune' ,
country: 'India' ,
gender: 'F' ,
zipCode: '111045' ,
},
];
city;
name;
code;
model() {
return this .details;
}
setupController(controller, model) {
super .setupController(controller, model);
controller.set( 'details' , this .details);
controller.set( 'someMoreDetails' ,
this .someMoreDetails);
controller.set( 'city' , this .city);
controller.set( 'code' , this .code);
controller.set( 'name' , this .name);
}
}
|
app/controllers/reduce1.js
import Ember from 'ember' ;
import { addObjects, shiftObject, setEach }
from '@ember/array' ;
export default Ember.Controller.extend({
actions: {
checkCity(city) {
let foo = this .details.
reduce((acc, person) =>
person.city == this .city ?
acc + person.name : acc, '' );
foo ? alert(`${foo} is from ${city} `)
: alert(`No one from ${city}`);
},
checkName(name) {
let foo = this .details.reduce((acc, person)
=> person.name == this .name ?
acc + person.city : acc, '' );
foo ? alert(`${name} from ${foo} `)
: alert(`No one of ${name}`);
},
checkCode(code) {
let foo = this .details.reduce((acc, person)
=> person.zipCode == this .code
? acc + person.name : acc, '' );
foo ? alert(`${foo} from ${code} `)
: alert(`No one of ${code}`);
},
},
});
|
app/templates/reduce1.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 Someone from City"
{{action 'checkCity' this .city}} />
</div>
<br /><br />
<div>
<label>Enter zipCode: </label>
{{input value= this .code}}
</div>
<div>
<input type= "button" id= "check-code"
value= "Check Someone from Zip-Code"
{{action 'checkCode' this .code}} />
</div><br /><br />
<div>
<label>Enter Name: </label>
{{input value= this .name}}
</div>
<div>
<input type= "button" id= "check-name"
value= "Check Someone by Name"
{{action 'checkName' this .name}} />
</div>
{{outlet}}
|
- Output: Visit localhost:4200/reduce1 to view the output
Ember.js EmberArray reduce method
Example 2: Type the following code to generate the route for this example:
ember generate route reduce2
app/routes/reduce2.js
import Route from '@ember/routing/route' ;
import { } from '@ember/array' ;
export default class FruitsRoute
extends Route {
item1 = [
{
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' ,
},
];
item2 = [
{
name: 'Lady Finger' ,
isFruit: false ,
color: 'green' ,
},
{
name: 'Brinjal' ,
isFruit: false ,
color: 'purple' ,
},
{
name: 'Potato' ,
isFruit: false ,
color: 'brown' ,
},
{
name: 'Onion' ,
isFruit: false ,
color: 'violet' ,
},
];
model() {
return this .item1;
}
setupController(controller, model) {
super .setupController(controller, model);
controller.set( 'item1' , this .item1);
controller.set( 'item2' , this .item2);
}
}
|
app/controllers/reduce2.js
import Ember from 'ember' ;
import { pushObjects, isAny } from '@ember/array' ;
export default Ember.Controller.extend({
actions: {
Check_item() {
let ans = this .item1.reduce((acc, item )
=> item.isFruit == true ? acc +
'\n' + item.name : acc, '' );
ans ? alert(`Yes it contains Fruit${ans}`)
: alert(`It doesn 't contains any Fruit`)
},
Check_item2() {
let ans = this.item1.reduce((acc, item )
=> item.isFruit == false ? acc
+ ' \n ' + item.name : acc, ' ');
ans ? alert(`Yes it contains Vegatabe ${ans}`) :
alert(`It doesn' t contains any Vegetable`)
},
pushMoreDetails() {
this .item1.pushObjects( this .item2);
},
},
});
|
app/templates/reduce2.hbs
{{page-title "Fruits" }}
<table style= " border-spacing : 30px" >
<h3>Here is a Bucket: </h3>
<ul>
{{ #each @model as |eatable|}}
<li>{{eatable.name}}</li>
{{/each}}
</ul>
</table>
<br /><br />
<input type= "button" id= "fruit-all"
value= "List Contains Any Fruit?"
{{action 'Check_item' }} />
<br /><br />
<input type= "button" id= "fruit-notAll"
value= "List Contains Any Vegetables?"
{{action 'Check_item2' }} />
<br /><br />
<input type= "button" id= "push-details"
value= "Add More Details"
{{action 'pushMoreDetails' }} />
{{outlet}}
|
- Output: Visit localhost:4200/reduce2 to view the output
Ember.js EmberArray reduce method
Reference: https://api.emberjs.com/ember/2.14/classes/Ember.Array/methods/reduce?anchor=reduce
Share your thoughts in the comments
Please Login to comment...