2016年8月28日日曜日

開発環境

Eloquent JavaScript(Marijn Haverbeke 著、No Starch Press)のPart 1(Language)、Chapter 3(Functions)、Exercises(Minimum, Recursion, Bean Counting)を取り組んでみる。

Exercises

コード(Emacs)

(function () {
    'use strict';
    var nums = [],
        i,
        min,
        str = '',
        ch,
        isEven,
        countChar,
        countBs;

    for (i = -9; i < 10; i += 1) {
        nums.push(i);
    }
    for (i = 0; i < 100; i += 1) {
        str += String.fromCharCode(Math.floor(Math.random() * 26) + 65);
    }
    min = function (x, y) {
        return x < y ? x : y;
    };
    nums.forEach(function (x) {
        nums.forEach(function (y) {
            console.log(x + ', ' + y + ': ' + min(x, y));
        });
    });
    isEven = function (x) {
        if (x < 0) {
            return 'Invliad number';
        }
        if (x === 0) {
            return true;
        }
        if (x === 1) {
            return false;
        }
        return isEven(x - 2);
    };
    console.log('isEven');
    nums.forEach(function (x) {
        console.log(x + ': ' + isEven(x));
    });
    console.log('57: ' + isEven(57));
    console.log('75: ' + isEven(75));
    console.log('-1: ' + isEven(-1));

    countBs = function (s) {
        var i,
            len = s.length,
            count = 0;

        for (i = 0; i < len; i += 1) {
            if (s.charAt(i) === 'B') {
                count += 1;
            }
        }
        return count;
    };
    console.log('str: ' + str);
    console.log(countBs(str));
    countChar = function (s, ch) {
        var i,
            len = s.length,
            count = 0;

        for (i = 0; i < len; i += 1) {
            if (s.charAt(i) === ch) {
                count += 1;
            }
        }
        return count;
    };
    ch = String.fromCharCode(Math.floor(Math.random() * 26) + 65);
    console.log(ch, countChar(str, ch));
}());

入出力結果(Terminal, Node.js)

$ node sample.js
-9, -9: -9
-9, -8: -9
-9, -7: -9
-9, -6: -9
-9, -5: -9
-9, -4: -9
-9, -3: -9
-9, -2: -9
-9, -1: -9
-9, 0: -9
-9, 1: -9
-9, 2: -9
-9, 3: -9
-9, 4: -9
-9, 5: -9
-9, 6: -9
-9, 7: -9
-9, 8: -9
-9, 9: -9
-8, -9: -9
-8, -8: -8
-8, -7: -8
-8, -6: -8
-8, -5: -8
-8, -4: -8
-8, -3: -8
-8, -2: -8
-8, -1: -8
-8, 0: -8
-8, 1: -8
-8, 2: -8
-8, 3: -8
-8, 4: -8
-8, 5: -8
-8, 6: -8
-8, 7: -8
-8, 8: -8
-8, 9: -8
-7, -9: -9
-7, -8: -8
-7, -7: -7
-7, -6: -7
-7, -5: -7
-7, -4: -7
-7, -3: -7
-7, -2: -7
-7, -1: -7
-7, 0: -7
-7, 1: -7
-7, 2: -7
-7, 3: -7
-7, 4: -7
-7, 5: -7
-7, 6: -7
-7, 7: -7
-7, 8: -7
-7, 9: -7
-6, -9: -9
-6, -8: -8
-6, -7: -7
-6, -6: -6
-6, -5: -6
-6, -4: -6
-6, -3: -6
-6, -2: -6
-6, -1: -6
-6, 0: -6
-6, 1: -6
-6, 2: -6
-6, 3: -6
-6, 4: -6
-6, 5: -6
-6, 6: -6
-6, 7: -6
-6, 8: -6
-6, 9: -6
-5, -9: -9
-5, -8: -8
-5, -7: -7
-5, -6: -6
-5, -5: -5
-5, -4: -5
-5, -3: -5
-5, -2: -5
-5, -1: -5
-5, 0: -5
-5, 1: -5
-5, 2: -5
-5, 3: -5
-5, 4: -5
-5, 5: -5
-5, 6: -5
-5, 7: -5
-5, 8: -5
-5, 9: -5
-4, -9: -9
-4, -8: -8
-4, -7: -7
-4, -6: -6
-4, -5: -5
-4, -4: -4
-4, -3: -4
-4, -2: -4
-4, -1: -4
-4, 0: -4
-4, 1: -4
-4, 2: -4
-4, 3: -4
-4, 4: -4
-4, 5: -4
-4, 6: -4
-4, 7: -4
-4, 8: -4
-4, 9: -4
-3, -9: -9
-3, -8: -8
-3, -7: -7
-3, -6: -6
-3, -5: -5
-3, -4: -4
-3, -3: -3
-3, -2: -3
-3, -1: -3
-3, 0: -3
-3, 1: -3
-3, 2: -3
-3, 3: -3
-3, 4: -3
-3, 5: -3
-3, 6: -3
-3, 7: -3
-3, 8: -3
-3, 9: -3
-2, -9: -9
-2, -8: -8
-2, -7: -7
-2, -6: -6
-2, -5: -5
-2, -4: -4
-2, -3: -3
-2, -2: -2
-2, -1: -2
-2, 0: -2
-2, 1: -2
-2, 2: -2
-2, 3: -2
-2, 4: -2
-2, 5: -2
-2, 6: -2
-2, 7: -2
-2, 8: -2
-2, 9: -2
-1, -9: -9
-1, -8: -8
-1, -7: -7
-1, -6: -6
-1, -5: -5
-1, -4: -4
-1, -3: -3
-1, -2: -2
-1, -1: -1
-1, 0: -1
-1, 1: -1
-1, 2: -1
-1, 3: -1
-1, 4: -1
-1, 5: -1
-1, 6: -1
-1, 7: -1
-1, 8: -1
-1, 9: -1
0, -9: -9
0, -8: -8
0, -7: -7
0, -6: -6
0, -5: -5
0, -4: -4
0, -3: -3
0, -2: -2
0, -1: -1
0, 0: 0
0, 1: 0
0, 2: 0
0, 3: 0
0, 4: 0
0, 5: 0
0, 6: 0
0, 7: 0
0, 8: 0
0, 9: 0
1, -9: -9
1, -8: -8
1, -7: -7
1, -6: -6
1, -5: -5
1, -4: -4
1, -3: -3
1, -2: -2
1, -1: -1
1, 0: 0
1, 1: 1
1, 2: 1
1, 3: 1
1, 4: 1
1, 5: 1
1, 6: 1
1, 7: 1
1, 8: 1
1, 9: 1
2, -9: -9
2, -8: -8
2, -7: -7
2, -6: -6
2, -5: -5
2, -4: -4
2, -3: -3
2, -2: -2
2, -1: -1
2, 0: 0
2, 1: 1
2, 2: 2
2, 3: 2
2, 4: 2
2, 5: 2
2, 6: 2
2, 7: 2
2, 8: 2
2, 9: 2
3, -9: -9
3, -8: -8
3, -7: -7
3, -6: -6
3, -5: -5
3, -4: -4
3, -3: -3
3, -2: -2
3, -1: -1
3, 0: 0
3, 1: 1
3, 2: 2
3, 3: 3
3, 4: 3
3, 5: 3
3, 6: 3
3, 7: 3
3, 8: 3
3, 9: 3
4, -9: -9
4, -8: -8
4, -7: -7
4, -6: -6
4, -5: -5
4, -4: -4
4, -3: -3
4, -2: -2
4, -1: -1
4, 0: 0
4, 1: 1
4, 2: 2
4, 3: 3
4, 4: 4
4, 5: 4
4, 6: 4
4, 7: 4
4, 8: 4
4, 9: 4
5, -9: -9
5, -8: -8
5, -7: -7
5, -6: -6
5, -5: -5
5, -4: -4
5, -3: -3
5, -2: -2
5, -1: -1
5, 0: 0
5, 1: 1
5, 2: 2
5, 3: 3
5, 4: 4
5, 5: 5
5, 6: 5
5, 7: 5
5, 8: 5
5, 9: 5
6, -9: -9
6, -8: -8
6, -7: -7
6, -6: -6
6, -5: -5
6, -4: -4
6, -3: -3
6, -2: -2
6, -1: -1
6, 0: 0
6, 1: 1
6, 2: 2
6, 3: 3
6, 4: 4
6, 5: 5
6, 6: 6
6, 7: 6
6, 8: 6
6, 9: 6
7, -9: -9
7, -8: -8
7, -7: -7
7, -6: -6
7, -5: -5
7, -4: -4
7, -3: -3
7, -2: -2
7, -1: -1
7, 0: 0
7, 1: 1
7, 2: 2
7, 3: 3
7, 4: 4
7, 5: 5
7, 6: 6
7, 7: 7
7, 8: 7
7, 9: 7
8, -9: -9
8, -8: -8
8, -7: -7
8, -6: -6
8, -5: -5
8, -4: -4
8, -3: -3
8, -2: -2
8, -1: -1
8, 0: 0
8, 1: 1
8, 2: 2
8, 3: 3
8, 4: 4
8, 5: 5
8, 6: 6
8, 7: 7
8, 8: 8
8, 9: 8
9, -9: -9
9, -8: -8
9, -7: -7
9, -6: -6
9, -5: -5
9, -4: -4
9, -3: -3
9, -2: -2
9, -1: -1
9, 0: 0
9, 1: 1
9, 2: 2
9, 3: 3
9, 4: 4
9, 5: 5
9, 6: 6
9, 7: 7
9, 8: 8
9, 9: 9
isEven
-9: Invliad number
-8: Invliad number
-7: Invliad number
-6: Invliad number
-5: Invliad number
-4: Invliad number
-3: Invliad number
-2: Invliad number
-1: Invliad number
0: true
1: false
2: true
3: false
4: true
5: false
6: true
7: false
8: true
9: false
57: false
75: false
-1: Invliad number
str: UNCQULWQPZTBZYLOPRPAZSIEVKQEKZMRVJSEUDICGJOWQKZPVQFNBNYJLATSBCBWPBRUFCBVVIEWLHXTPDLPWPRGRSKRJJXRCYJX
6
A 2
$

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