Ember.js Ember.NativeArray reject() 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 reject() method provides a list of all the enumerated elements for which the provided function returns false.

Syntax:

reject(callback, target)

Parameters:

callback: The callback function to check with.
target: The object whose elements are to be checked.

Return Value: Matched objects.

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 party

app/routes/party.js

Javascript

import Route from "@ember/routing/route"; 
  
export default class PartyRoute extends Route { 
    partyItems = [ 
        "Digital Camera", 
        "Jugs, cups & straws", 
        "Balloons", 
        "Scissors", 
        "Cold Drink", 
        "Table Confetti", 
        "Party Hats", 
        "Wine", 
        "Napkins", 
        "Party Plates", 
        "Speakers", 
        "Music System", 
        "Cups", 
    ]; 
    itemString; 
    itemList; 
    start; 
    end; 
    helper(itemString) { 
        this.itemList = itemString.split(","); 
        for (let i = 0; i < this.itemList.length; i++) 
            this.itemList[i] = this.itemList[i].trim(); 
        return this.itemList; 
    } 
    model() { 
        return this.partyItems; 
    } 
    setupController(controller, model) { 
        this._super(controller, model); 
        controller.set("helper", this.helper); 
        controller.set("partyItems", this.partyItems); 
        controller.set("itemString", this.itemString); 
        controller.set("itemList", this.itemList); 
        controller.set("start", this.start); 
        controller.set("end", this.end); 
    } 
}

app/controllers/party.js

Javascript

import Ember from 'ember'; 
import { 
    objectsAt, removeObject, removeObjects, slice, 
    reverseObjects, setObjects, reject 
} 
    from '@ember/array'; 
  
export default Ember.Controller.extend({ 
    actions: { 
        getItems(itemString) { 
            this.itemList = this.helper(itemString); 
            for (let i = 0; i < this.itemList.length; i++) 
                this.itemList[i] = parseInt(this.itemList[i]); 
            let tempItems = this.partyItems.objectsAt(this.itemList); 
            let str = ''; 
            for (let i = 0; i < tempItems.length; i++) 
                str += tempItems[i] + '\n'; 
            alert(str); 
        }, 
        removeItems(itemString) { 
            this.itemList = this.helper(itemString); 
            if (this.itemList.length == 1) 
                this.partyItems.removeObject(this.itemList[0]); 
            else
                this.partyItems.removeObjects(this.itemList); 
            this.set('itemString', ''); 
        }, 
        sliceItems(start, end) { 
            let tempItems = this.partyItems.slice(start, end); 
            let str = ''; 
            for (let i = 0; i < tempItems.length; i++) 
                str += tempItems[i] + '\n'; 
            alert(str); 
        }, 
        reverseItems() { 
            this.set('partyItems', this.partyItems.reverseObjects()); 
        }, 
        replaceItems(itemString) { 
            this.partyItems.setObjects(this.helper(itemString)); 
        }, 
        findMultiwordItems() { 
            let reqItem = this.partyItems.reject((item) => 
                item.split(' ').toArray().length == 1); 
            alert(reqItem); 
        } 
    }, 
});

app/template/party.hbs

HTML

{{page-title "Party"}} 
<h3>Here is a list of items: </h3> 
<ul> 
    {{#each @model as |party|}} 
    <li>{{party}}</li> 
    {{/each}} 
</ul> 
  
<br /><br /> 
<div> 
    <label>Enter Items: </label> 
    {{input value=this.itemString}} 
</div> 
<div> 
    <input type="button" id="remove-item" 
        value="Remove Items"
        {{action 'removeItems' this.itemString}} /> 
</div> 
<br /><br /> 
<div> 
    <label>Enter Start Index: </label> 
    {{input value=this.start}} 
</div> 
<div> 
    <label>Enter End Index: </label> 
    {{input value=this.end}} 
</div> 
<div> 
    <input type="button" id="slice" 
        value="Slice"
        {{action 'sliceItems' this.start this.end}} /> 
</div> 
<br /><br /> 
<div> 
    <label>Enter Indices: </label> 
    {{input value=this.itemString}} 
</div> 
<div> 
    <input type="button" id="get-item" 
        value="Get Items" 
        {{action 'getItems' this.itemString}} /> 
</div> 
<br /><br /> 
<div> 
    <label>Enter Items: </label> 
    {{input value=this.itemString}} 
</div> 
<div> 
    <input type="button" id="replace-item" 
        value="Replace Items" 
        {{action 'replaceItems' this.itemString}} /> 
</div> 
<br /><br /> 
<input type="button" id="reverse-items" 
    value="Reverse"
    {{action 'reverseItems' }} /> 
<br /><br /> 
<input type="button" id="find-items" 
    value="Find"
    {{action 'findMultiwordItems' }} /> 
{{outlet}}

Output: Visit localhost:4200/party to view the output:

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

ember generate route movie

app/routes/movie.js

Javascript

import Route from '@ember/routing/route'; 
  
export default class MovieRoute extends Route { 
    movies = [ 
        'The Shawshank Redemption', 
        'The Godfather', 
        'The Dark Knight', 
        'Schindler\'s List', 
        'The Godfather Part II', 
        '12 Angry Men', 
        'Pulp Fiction ', 
        'Raging Bull', 
        'Parasite', 
        'Se7en', 
        '3 Idiots', 
        'Forrest Gump', 
        'The Green Mile'
    ] 
    itemString; 
    itemList; 
    helper(itemString) { 
        this.itemList = itemString.split(','); 
        for (let i = 0; i < this.itemList.length; i++) 
            this.itemList[i] = this.itemList[i].trim(); 
        return this.itemList; 
    } 
    model() { 
        return this.movies; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('helper', this.helper); 
        controller.set('movies', this.movies); 
        controller.set('itemString', this.itemString); 
        controller.set('itemList', this.itemList); 
    } 
}

app/controllers/movie.js

Javascript

import Ember from "ember"; 
import { 
    objectsAt, 
    removeObject, 
    removeObjects, 
    setObjects, 
    reject, 
} from "@ember/array"; 
  
export default Ember.Controller.extend({ 
    actions: { 
        getItems(itemString) { 
            this.itemList = this.helper(itemString); 
            for (let i = 0; i < this.itemList.length; i++) 
                this.itemList[i] = parseInt(this.itemList[i]); 
            let tempItems = this.movies.objectsAt(this.itemList); 
            let str = ""; 
            for (let i = 0; i < tempItems.length; i++) 
                str += tempItems[i] + "\n"; 
            alert(str); 
        }, 
        removeItems(itemString) { 
            this.itemList = this.helper(itemString); 
            if (this.itemList.length == 1) 
                this.movies.removeObject(this.itemList[0]); 
            else this.movies.removeObjects(this.itemList); 
            this.set("itemString", ""); 
        }, 
        replaceItems(itemString) { 
            this.movies.setObjects(this.helper(itemString)); 
        }, 
        findSingleWordItems() { 
            let reqItem = this.movies.reject( 
                (item) => item.split(" ").toArray().length > 1 
            ); 
            alert(reqItem); 
        }, 
    }, 
});

app/template/movie.hbs

HTML

{{page-title "Movie"}} 
<h3>Here is a list of Movies: </h3> 
<ul> 
    {{#each @model as |movie|}} 
    <li>{{movie}}</li> 
    {{/each}} 
</ul> 
<br/><br/> 
<div> 
    <label>Enter Movies: </label> 
    {{input value=this.itemString}} 
</div> 
<div> 
    <input type="button" id="remove-item" 
           value="Remove Movie" { 
           {action 'removeItems' this.itemString}}/> 
</div> 
<br/><br/> 
<div> 
    <label>Enter Indices: </label> 
    {{input value=this.itemString}} 
</div> 
<div> 
    <input type="button" id="get-item" 
           value="Get Movies" 
           {{action 'getItems' this.itemString}}/> 
</div> 
<br/><br/> 
<div> 
    <label>Enter Movies: </label> 
    {{input value=this.itemString}} 
</div> 
<div> 
    <input type="button" id="replace-item" 
           value="Replace Movies" 
           {{action 'replaceItems' this.itemString}}/> 
</div> 
<br/><br/> 
<input type="button" id="find-items" value="Find"
       {{action 'findSingleWordItems'}}/> 
{{outlet}}