JavaScript - Lists(Iterating Through a List, while loop)

Data Structures and Algorithms With Javascript
(O'Reilly Media)
Michael McMillan(著)

開発環境

• OS X Yosemite - Apple (OS)
• Emacs (Text Editor)
• JavaScript (プログラミング言語)
• SpiderMonkey (JavaScript engine)

Data Structures and Algorithms With Javascript (Michael McMillan(著)、O'Reilly Media)のChapter 3(Lists)、Exercises 3.(No. 2421)を解いてみる。

Exercises 3.(No. 2421)

JavaScript(Emacs)

/*jslint         browser : true, continue : true,
  devel  : true, indent  : 4,    maxerr   : 50,
  newcap : true, nomen   : true, plusplus : false,
  regexp : true, sloppy  : true, vars     : false,
  white  : true
*/

var List = function () {
        this.list_size = 0;
        this.pos = 0;
        this.data_store = [];
    };

List.prototype.append = function (element) {    
    this.data_store[this.list_size] = element;
    this.list_size += 1;
};
List.prototype.find = function (element) {
    var i,
        max;
    for (i = 0, max = this.data_store.length; i < max; i += 1) {
        if (this.data_store[i] === element) {
            return i;
        }
    }
    return -1;
};
List.prototype.remove = function (element) {
    var found_at = this.find(element);

    if (found_at > -1) {
        this.data_store.splice(found_at, 1);
        this.list_size -= 1;
        return true;
    }
    return false;
};
List.prototype.length = function () {
    return this.list_size;
};
List.prototype.toString = function () {
    return this.data_store;
};
List.prototype.insert = function (element, after) {
    var insert_pos = this.find(after);
    if (insert_pos > -1) {
        this.data_store.splice(insert_pos + 1, 0, element);
        this.list_size += 1;
        return true;
    }
    return false;
};
List.prototype.clear = function () {
    this.data_store = [];
    this.list_size = this.pos = 0;
};
List.prototype.contains = function (element) {
    var i,
        max;
    for (i = 0, max = this.dataStore.length; i < max; i += 1) {
        if(this.data_store[i] === element) {
            return true;
        }
    }
    return false;
};
List.prototype.moveTo = function (pos) {
    this.pos = pos;
};
List.prototype.getElement = function () {
    return this.data_store[this.pos];
};
List.prototype.previous = function () {
    this.pos -= 1;
    return this.data_store[this.pos];
};
List.prototype.next = function () {
    var element = this.data_store[this.pos];
    this.pos += 1;
    return element;
};
List.prototype.hasNext = function () {
    if (this.pos > this.list_size - 1) {
        return false;
    }
    return true;
};
List.prototype.hasPrevious = function () {
    if (this.ps <= 0) {
        return false;
    }
    return true;
};
List.prototype.front = function () {
    this.pos = 0;
};
List.prototype.end = function () {
    this.pos = this.list_size - 1;
};
List.prototype.currPos = function () {
    return this.pos;
};

var Person = function (name, gender) {
        this.name = name;
        this.gender = gender;
    },    
    m1 = new Person('male1', 'male'),
    m2 = new Person('male2', 'male'),
    f1 = new Person('female1', 'female'),
    f2 = new Person('female2', 'female'),
    o1 = new Person('other1', 'other'),
    people = new List(),
    displayPeople = function (people, gender) {
        var person;

        people.front();
        while (people.hasNext()) {
            person = people.next();
            if (person.gender === gender) {
                print(person.name);
            }
        }
    };

people.append(m1);
people.append(m2);
people.append(f1);
people.append(f2);
people.append(o1);

print('male');
displayPeople(people, 'male');
print('female');
displayPeople(people, 'female');
print('others');
displayPeople(people, 'other');

出力結果(Terminal, shell, SpiderMonkey)

$ js sample3.js
male
male1
male2
female
female1
female2
others
other1
$