Ember.js EmberArray isEvery() Method

import Route from '@ember/routing/route';

class student {
    name = null;
    gender = null;
    class = null;
    grade = null;
    constructor(name, gender, class, grade) {
        this.name = name;
        this.gender = gender;
        this.class = class;
        this.grade = grade
    }

    show_grade() {
        return `I am ${this.name} of 
        Class ${this.class} Get ${this.grade}`;
    }
}

export default class StudentsRoute
    extends Route {
    students = 
    [new student('Aakash', 'M', 10, 'A',),
    new student('Soniya', 'F', 8, 'C'),
    new student('Esnoor', 'M', 9, 'C'),
    new student('Isha', 'F', 11, 'B',),
    new student('Doman', 'M', 12, 'B'),
    new student('Lolu', 'M', 10, 'A'),
    new student('Satyam', 'M', 10, 'A'),
    ];
    temp2;
    temp;
    model() {
        return this.students;
    }
    setupController(controller, model) {
        super.setupController(controller, model);
        controller.set('students', this.students);
        controller.set('temp', this.temp);
        controller.set('temp1', this.temp1);
        controller.set('temp2', this.temp2);
    }
}

import Ember from 'ember';
import { mapBy } from '@ember/array';

export default Ember.Controller.extend({
    actions: {
        Every_Pass() {
            let ans = 
            this.students.isEvery('grade', 'F');
            ans ? alert(`All Student Doesn't pass in Exam`) : 
            alert('All Student pass in Exam');
        },
        Every_Female() {
            let ans = 
            this.students.isEvery('gender', 'F');
            ans ? alert(`All Student are Female`) : 
            alert('All Student are not Female');
        },
        Every_male() {
            let ans = 
            this.students.isEvery('gender', 'M');
            ans ? alert(`All Student are male`) : 
            alert('All Student are not Male');
        },

    },
});

{ { page - title "Student" } }
<h3>List of Students: </h3>
<br /><br />
<table>
    <tr>
        <th>Name</th>
        <th>Gender </th>
        <th>Class </th>
        <th>Grade </th>
    </tr>
    {{#each @model as |detail|}}
    <tr>
        <td>{{detail.name}}</td>
        <td> {{detail.gender}}</td>
        <td>{{detail.class}}</td>
        <td>{{detail.grade}}</td>
    </tr>
    {{/each}}
</table>

<br/>
<br/>
<div>
    <input type="button"
           id="check-pass" 
           value="Is Every One Pass" 
           {{action 'Every_Pass' }} />
</div>
<br/>
<div>
    <input type="button"
           id="check-female" 
           value="Is All Student Female" 
           {{action 'Every_Female' }} />
</div>
<br/>
<div>
    <input type="button"
           id="check-male" 
           value="Is All Student male" 
           {{action 'Every_male' }} />
</div>
{ { outlet } }

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',
        },
        {
            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);
    }
}

import Ember from 'ember';
import { removeAt, unshiftObjects, objectAt,
        uniqBy, find } from '@ember/array';

export default Ember.Controller.extend({
    actions: {
        removeDetails(start, end) {
            this.item1.removeAt(start, end);
        },
        All_fruit() {
            let foo = 
            this.item1.isEvery('isFruit');
            foo ? alert(`Yes all Item are Fruit`)
            : alert(`There is some other items`)
        },
        Any_Vegy() {
            let foo = 
            this.item1.isAny('isFruit', false);
            foo ? alert(`Yes It contains Vegetable also`)
            : alert(`There is No Vegetable in list`)
        },
    },
});

{{page-title "Fruits"}}
<table style=" border-spacing : 30px">
<h3>Here is a list 1: </h3>
<ul>
    {{#each @model as |eatable|}}
    <li>{{eatable.name}}</li>
    {{/each}}
</ul>
</table>
<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="remove-details"
        value="Remove Details"
        {{action 'removeDetails'
        this.start this.end}} />
</div>
<br /><br />
<input type="button" id="all-Fruit"
    value="All item are Fruits"
    {{action 'All_fruit' }} />

<br /><br />
<input type="button" id="any-vegy"
    value="Any item are Vegetables"
    {{action 'Any_Vegy' }} />

{{outlet}}