2015年7月24日金曜日

開発環境

Data Structures and Algorithms With Javascript (Michael McMillan(著)、O'Reilly Media)のChapter 6(Linked Lists)、Exercises 4.(No. 4245)を解いてみる。

Exercises 4.(No. 4245)

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
*/

/*global print, readline*/
var Node = function (element) {
        this.element = element;
        this.next = null;
    },
    LinkedList = function () {
        this.head = new Node('head');
    },
    grades = new LinkedList(),
    grade;

LinkedList.prototype.find = function (item) {
    var curr_node = this.head;
    while (curr_node.element !== item) {
        curr_node = curr_node.next;
    }
    return curr_node;
};
LinkedList.prototype.insert = function (new_element, item) {    
    var new_node = new Node(new_element),
        current = this.find(item);
    new_node.next = current.next;
    current.next = new_node;
};
LinkedList.prototype.display = function () {
    var curr_node = this.head;
    while (curr_node.next !== null) {
        print(curr_node.next.element);
        curr_node = curr_node.next;
    }
};
LinkedList.prototype.findPrevious = function (item) {
    var curr_node = this.head;
    while (curr_node !== null && curr_node.next.element !== item) {
        curr_node = curr_node.next;
    }
    return curr_node;
};
LinkedList.prototype.remove = function (item) {
    var prev_node = this.findPrevious(item);
    
    if (prev_node.next !== null) {
        prev_node.next = prev_node.next.next;
    }
};
LinkedList.prototype.show = function () {
    var curr_node = this.head;

    if (curr_node.next !== null) {
        print(curr_node.next.element);
    }
};

grade = readline();
while (grade !== 'quit') {
    grades.insert(grade, 'head');
    grade = readline();
}
grades.display();

出力結果(Terminal, shell, SpiderMonkey)

$ jslint sample4.js

sample4.js is OK.
$ js sample4.js
A
B
C
D
E
A
B
quit
B
A
E
D
C
B
A
$ 

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