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