Ember.js MutableArray clear() Method
Last Updated :
31 Aug, 2022
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 clear() method removes all the elements in the array
Syntax:
clear()
Parameters: It doesn’t take any parameters.
Return Value: An empty array.
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
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
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
{{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 list
app/routes/list.js
import Route from "@ember/routing/route" ;
export default class ListRoute extends Route {
list = [ "a" , "a" , "v" , "c" , "c" , "a" ,
"d" , "q" , "b" , "z" , "a" ];
item;
idx;
model() {
return this .list;
}
setupController(controller, model) {
super .setupController(controller, model);
controller.set( "list" , this .list);
controller.set( "item" , this .item);
controller.set( "idx" , this .idx);
}
}
|
app/controllers/list.js
import Ember from "ember" ;
import {
clear, insertAt, indexOf, lastIndexOf,
includes
} from "@ember/array" ;
export default Ember.Controller.extend({
actions: {
insertItem(item, idx) {
this .list.insertAt(idx, item);
},
getLastIndex(item) {
let res = this .list.lastIndexOf(item);
alert(res);
},
getFirstIndex(item) {
let res = this .list.indexOf(item);
alert(res);
},
clearList() {
this .list.clear();
},
contains(item) {
let res = this .list.includes(item);
alert(`The list ${res ? "" : "does not" }
contains ${item}`);
},
},
});
|
app/template/list.hbs
{{page-title "List"}}
< h3 >Here is a list of Items: </ h3 >
< ul >
{{#each @model as |i|}}
< li >{{i}}</ li >
{{/each}}
</ ul >
< br />< br />
< div >
< label >Enter Item: </ label >
{{input value=this.item}}
</ div >
< div >
< label >Enter Index: </ label >
{{input value=this.idx}}
</ div >
< div >
< input type = "button" id = "insert-item"
value = "Insert Item"
{{action "insertItem" this.item this.idx}} />
</ div >
< br />< br />
< div >
< label >Enter Item: </ label >
{{input value=this.item}}
</ div >
< div >
< input type = "button" id = "first-index-item"
value = "Get First Index"
{{action "getFirstIndex" this.item}} />
</ div >
< div >
< input type = "button" id = "last-index-item"
value = "Get Last Index"
{{action "getLastIndex" this.item}} />
</ div >
< div >
< input type = "button" id = "contains-item"
value = "Contains?"
{{action "contains" this.item}} />
</ div >
< br />< br />
< input type = "button" id = "clear-items"
value = "Clear" {{action "clearList" }} />
{{outlet}}
|
Output: Visit localhost:4200/list to view the output
Reference: https://api.emberjs.com/ember/4.4/classes/MutableArray/methods
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