Ember.js MutableArray clear() Method

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);
    }
}

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();
        },
    },
});

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);
    }
}

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}`);
        },
    },
});