2017年5月6日土曜日

開発環境

Think Perl 6: How to Think Like a Computer Scientist (Laurent Rosenfeld(著)、Allen B. Downey(著)、Oreilly & Associates Inc)の Part 1(Starting with the basics)、Chapter 7(Strings)の Exercise 7-1、7-3.を JavaScript で取り組んでみる。

Exercise 7-1、7-3.

コード(Emacs)

HTML5

<pre id="output0"></pre>
<label for="word0">word0: </label>
<input id="word0" type="text" value="banana">
<label for="letter0">letter0: </label>
<input id="letter0" type="text" value="a">
<label for="word1">word1: </label>
<input id="word1" type="text" value="IBM">
<label for="word1">n = </label>
<input id="n0" type="number" step="1" value="-1">

<button id="run0">run</button>
<button id="clear0">clear</button>

<script src="sample1.js"></script>

JavaScript

let btn0 = document.querySelector('#run0'),
    btn1 = document.querySelector('#clear0'),
    pre0 = document.querySelector('#output0'),
    input_word0 = document.querySelector('#word0'),
    input_letter0 = document.querySelector('#letter0'),
    input_word1 = document.querySelector('#word1'),
    input_n = document.querySelector('#n0'),
    inputs = [input_word0, input_letter0, input_word1, input_n],
    p = (x) => pre0.textContent += x + '\n';

let count = (word, letter) => {
    let count = 0,
        i = 0;

    for(;;) {
        i = word.indexOf(letter, i);
        if (i === -1) {
            break;
        }
        i += 1;
        count += 1;
    }
    return count;
};
let count1 = (word, letter) => {
    let count = 0;
    for (let i = 0; i < word.length; i += 1) {
        if (word.substring(i, i + 1) === letter) {
            count += 1;
        }
    }
    return count;
};
let count2 = (word, letter) =>
    word.split('').filter((c) => c === letter).length;

let rotateLetter = (letter, n) => {
    n %= 26;
    n += n < 0 ? 26 : 0;

    let o = letter.codePointAt(0) + n;

    if (/[a-z]/.test(letter)) {
        return String.fromCodePoint(o - ('z'.codePointAt(0) < o ? 26 : 0));
    }
    if (/[A-Z]/.test(letter)) {
        return String.fromCodePoint(o - ('Z'.codePointAt(0) < o ? 26 : 0));
    }
    return letter;
};
let rotateWord = (word, n) =>
    word.split('')
    .map((c) => rotateLetter(c, n))
    .join('');

let UnitTest = () => {
    let that = {},
        run = () => {            
            Object.keys(that).forEach((key) => {
                if (that.setUp) {
                    that.setUp();
                }
                if (/^test/.test(key)) {
                    p(key);
                    that[key]();
                }
                if (that.tearDown) {
                    that.tearDown();
                }
            });        
        },
        assertEqual = (x, y) => {
            if (x === y) {
                p('ok');
            } else {
                p(`failure - ${x} !== ${y}`);
            }
        },
        assertTrue = (x) => {
            if (x) {
                p('ok');
            } else {
                p(`failure`);
            }
        },
        assertFalse = (x) => {
            if (x) {
                p('failure');
            } else {
                p(`ok`);
            }
        },
        assertThrow = (fn, name) => {
            try {
                fn();
                p('failure');
            } catch (e) {
                if (e.name === name) {
                    p('ok');
                } else {
                    p('failure');
                }
            }
        };

    that.run = run;
    that.assertEqual = assertEqual;
    that.assertTrue = assertTrue;
    that.assertFalse = assertFalse;
    that.assertThrow = assertThrow;

    return that;
};

let Test = () => {
    let that = UnitTest();

    that.test_count01 = () => that.assertEqual(count('', 'a'), 0);
    that.test_count02 = () => that.assertEqual(count('a', 'a'), 1);
    that.test_count03 = () => that.assertEqual(count('b', 'a'), 0);
    that.test_count04 = () => that.assertEqual(count('banana', 'a'), 3);
    that.test_count05 = () => that.assertEqual(count('bnn', 'a'), 0);
    that.test_count06 = () => that.assertEqual(count('日本語', 'a'), 0);
    that.test_count07 =
        () => that.assertEqual(count('日本語abcde日本語', '日'), 2);

    that.test_count11 = () => that.assertEqual(count1('', 'a'), 0);
    that.test_count12 = () => that.assertEqual(count1('a', 'a'), 1);
    that.test_count13 = () => that.assertEqual(count1('b', 'a'), 0);
    that.test_count14 = () => that.assertEqual(count1('banana', 'a'), 3);
    that.test_count15 = () => that.assertEqual(count1('bnn', 'a'), 0);
    that.test_count16 = () => that.assertEqual(count1('日本語', 'a'), 0);
    that.test_count17 =
        () => that.assertEqual(count1('日本語abcde日本語', '日'), 2);

    that.test_count21 = () => that.assertEqual(count2('', 'a'), 0);
    that.test_count22 = () => that.assertEqual(count2('a', 'a'), 1);
    that.test_count23 = () => that.assertEqual(count2('b', 'a'), 0);
    that.test_count24 = () => that.assertEqual(count2('banana', 'a'), 3);
    that.test_count25 = () => that.assertEqual(count2('bnn', 'a'), 0);
    that.test_count26 = () => that.assertEqual(count2('日本語', 'a'), 0);
    that.test_count27 =
        () => that.assertEqual(count2('日本語abcde日本語', '日'), 2);

    that.test_rotate1 = () => that.assertEqual(rotateWord('A', 3), 'D');
    that.test_rotate2 = () => that.assertEqual(rotateWord('Z', 1), 'A');
    that.test_rotate3 = () => that.assertEqual(rotateWord('cheer', 7), 'jolly');
    that.test_rotate4 =
        () => that.assertEqual(rotateWord('melon', -10), 'cubed');
    that.test_rotate5 = () => that.assertEqual(rotateWord('IBM', -1), 'HAL');
    that.test_rotate6 =
        () => that.assertEqual(
            rotateWord(rotateWord('Think Perl 6', 13), 13),
            'Think Perl 6');
    return that;
};


let output = () => {
    Test().run();

    let word0 = input_word0.value,
        letter0 = input_letter0.value,
        word1 = input_word1.value,
        n = parseInt(input_n.value, 10);

    p(count(word0, letter0));
    p(count1(word0, letter0));
    p(count2(word0, letter0));
    p(rotateWord(word1, n));
};

inputs.forEach((input) => input.onchange = output);
btn0.onclick = output;
btn1.onclick = () => pre0.textContent = '';

output();



















 
						

0 コメント:

コメントを投稿

Comments on Google+: