Ember.js ArrayProxy cacheFor() Method

Last Updated : 26 Apr, 2025

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 cacheFor() method of ArrayProxy is a method that is used to get the cached value of the computed property if it exists. This method helps us to inspect the value of the computed property without invoking the property.

Syntax:

this.object.cacheFor( keyName );

Parameters:

keyName: It is the name of the property whose value of the computed property we want.

Return: It returns the cached value of the computed property if exists.

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 test1

app/routes/test1.js

Javascript

import Route from '@ember/routing/route'; 
import { computed } from '@ember/object'; 
import ArrayProxy from '@ember/object/proxy'; 
  
const Employee = ArrayProxy.extend({ 
    toStringExtension() { 
        return this.get('name'); 
    }, 
    fullName: computed('firstName', 'lastName', 
        function () { 
            return this.get('firstName') + ' '
                + this.get('lastName'); 
        }) 
}); 
  
export default class DetailsRoute extends Route { 
    person; 
    createPerson() { 
        let person = Employee.create({ 
            firstName: 'Sam', 
            lastName: 'Snehil', 
            age: 32, 
            mobile: '837483837847', 
            country: 'India', 
            language: 'Tamil', 
            salary: 34000, 
            gender: 'M', 
            zipCode: '476384', 
        }); 
        return person 
    } 
  
    model() { 
        this.person = this.createPerson(); 
        return this.person 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('person', this.person); 
    } 
} 

app/controllers/test1.js

Javascript

import Ember from 'ember'; 
import EmberObject from '@ember/object'; 
  
export default Ember.Controller.extend({ 
  
    actions: { 
        store() { 
            let temp = this.person.cacheFor('fullName'); 
            console.log(temp + ' Cached From ' + 
                this.person.toString()) 
        } 
    } 
});

app/templates/test1.hbs

HTML

{{page-title "ArrayProxy"}} 
<table> 
    <h1>Employee's Details: </h1> 
    <div><b>Name:</b> {{this.person.fullName}}</div> 
    <div><b>Gender:</b> {{this.person.gender}}</div> 
    <div><b>Country:</b> {{this.person.country}}</div> 
    <div><b>Salary:</b> {{this.person.salary}}</div> 
    <div><b>Zip Code:</b> {{this.person.zipCode}}</div> 
    <div><b>Language Speaks:</b>{{this.person.language}}</div> 
    <div><b>Mobile No.:</b>{{this.person.mobile}}</div> 
    <div><b>Age:</b> {{this.person.age}}</div> 
</table> 
  
<br /><br/> 
<input
    type="button"
    id="Cache"
    value="Cache the Property"
    {{action 'store'}} 
> 
{{outlet}}

Output:

cacheFor output1

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

ember generate route test2

app/routes/test2.js

Javascript

import Route from '@ember/routing/route'; 
import ArrayProxy from '@ember/object'; 
import { computed } from '@ember/object'; 
  
const Person = ArrayProxy.extend({ 
    Grade: computed('marks', function () { 
        let temp = this.get('marks') 
        return temp > 80 ? 'A' : temp > 70 ? 'B' : 
            temp > 60 ? 'C' : 'D'; 
    }), 
    toStringExtension() { 
        return this.get('name'); 
    }, 
}); 
  
export default class StudentsRoute extends Route { 
    person = Person.create({ 
        name: 'Umesh dubey', 
        gender: 'M', 
        class: 10, 
        marks: 83, 
        mobile: '8399384948', 
        Roll_No: '1029394', 
        Branch: 'Commerce', 
    }) 
  
    model() { 
        return this.person; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('person', this.person); 
    } 
}

app/controllers/test2.js

Javascript

import Ember from 'ember'; 
import EmberObject from '@ember/object'; 
import { cacheFor, destroy } from '@ember/object'; 
  
export default Ember.Controller.extend({ 
    actions: { 
  
        storeNonCompute() { 
            let temp = this.person.cacheFor('name'); 
            console.log(temp + ' is Cached From ' + 
                this.person.toString()) 
        }, 
        storeCompute() { 
  
            let temp = this.person.cacheFor('Grade'); 
            console.log(`'${temp}'` + ' Grade is Cached2 From ' + 
                this.person.toString()) 
        }, 
  
    } 
}); 

app/templates/test2.js

HTML

{{page-title "ArrayProxy"}} 
<table> 
    <h1>Student's Details:</h1> 
    <div><b>Name:</b> {{this.person.name}}</div> 
    <div><b>Gender:</b> {{this.person.gender}}</div> 
    <div><b>Class:</b> {{this.person.class}}</div> 
    <div><b>Mobile:</b> {{this.person.mobile}}</div> 
    <div><b>Grade:</b> {{this.person.Grade}}</div> 
    <div><b>Marks:</b> {{this.person.marks}}</div> 
    <div><b>Branch:</b> {{this.person.Branch}}</div> 
      
  
</table> 
<br /><br/> 
<input
    type="button"
    id="CacheFor"
    value="Cache the Non Computed Property"
    {{action 'storeNonCompute'}} 
/><br /><br/> 
<input
    type="button"
    id="CacheFor"
    value="Cache the computed Property"
    {{action 'storeCompute'}} 
/> 
{{outlet}}