JavaScript data structures and algorithms-array exercises

I. Create an object that records student performance, provide a way to add results, and a way to show average student performance.

// 创建一个记录学生成绩的对象const Students = function Students () {    this.grades = [];    this.addGrage = addGrade;    this.getAverage = getAverage;};// 提供一个添加成绩的方法function addGrade (grade) {    this.grades.push(grade);}// 以及一个显示学生平均成绩的方法function getAverage () {    let total = 0;    let len = this.grades.length;    while (len--) {        total += parseInt(this.grades[len], 10);    }    return total / this.grades.length;}// 示例let Mazey = new Students();Mazey.addGrage(90);Mazey.addGrage(91);Mazey.addGrage(87);Mazey.addGrage(99);Mazey.addGrage(89);Mazey.addGrage(85);Mazey.addGrage(92);console.log(Mazey.getAverage());

Two. Store a set of words in an array and display the words in both positive and reverse order.

// 将一组单词存储在一个数组中let arr = [`Mazey`, `Cherrie`, `John`, `Ada`, `Chole`];// 正序console.log(arr.sort());// 倒序console.log(arr.sort().reverse());

Three. Create an object that uses a two-dimensional array to store useful data for each month, and add methods to display the average number of average months, the average of a particular week, and the averages of all weeks.

Const MONTHDATA = function Monthdata () {//Initialize month data This.monthdata = (function () {Let arr = [];        Let week = 4;        Let day = 7;            while (week--) {Arr[week] = [];            while (day--) {Arr[week][day] = 0;        } day = 7;        } console.log (arr);    return arr;    })();    This.adddata = AddData;    This.getmonthaverage = Getmonthaverage;    This.getweekaverage = Getweekaverage; This.getallweekaverage = Getallweekaverage;}; function AddData (week, day, data) {This.monthdata[week][day] = data;}    function Getmonthaverage () {Let arr = this.monthdata, total = 0, day = 0; for (Let i = 0; i < arr.length; i++) {to (Let J = 0; J < Arr[i].length; J + +) {Total + = parseint            (Arr[i][j], 10);        day++; }} return total/day;}    function Getweekaverage (week) {Let arr = This.monthdata[week], total = 0; for (Let i = 0; i < ARR.LEngth;    i++) {Total + = parseint (Arr[i], 10); } return total/arr.length;}            function Getallweekaverage () {Let itself = this, week = this.monthData.length, total = (function () {            Let total = 0;             for (Let i = 0; i < week; i++) {Total + = Self.getweekaverage (i) * Self.monthdata[i].length}        return total;        })(); return Total/week;} Example Let Mazey = new Monthdata (); Mazey.adddata (0, 1, 100); Mazey.adddata (0, 2, 100); Mazey.adddata (0, 3, 100); Mazey.adddata (0, 4, 100); Mazey.adddata (1, 6, 7); Console.log (Mazey.getmonthaverage ()); Console.log (mazey.getweekaverage (0)); Console.log ( Mazey.getweekaverage (1)); Console.log (Mazey.getallweekaverage ());

Four. Create an object that stores the letters in an array and uses a method to connect the letters together and display them as a single word.

const Letter = function Letter () {    this.characters = [];    this.addCharacter = addCharacter;    this.toLetter = toLetter;};function addCharacter (character) {    this.characters.push(character);}function toLetter () {    return this.characters.join(``);}// 示例let Mazey = new Letter();Mazey.addCharacter(`m`);Mazey.addCharacter(`a`);Mazey.addCharacter(`z`);Mazey.addCharacter(`e`);Mazey.addCharacter(`y`);console.log(Mazey.toLetter()); // mazey

JavaScript data structures and algorithms-array exercises