開発環境
- macOS Sierra - Apple (OS)
- Emacs (Text Editor)
- JavaScript (プログラミング言語)
- Node.js, Safari(JavaScript エンジン)
- Learning JavaScript [邦訳](参考書籍)
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 4(Fruitful Subroutines)の Boolean Functions の Exercises. を JavaScript で取り組んでみる。
Exercises(Compare).
コード(Emacs)
HTML5
<pre id="output0"></pre> x = <input id="x0" type="number" value="1"> y = <input id="y0" type="number" value="1"> z = <input id="z0" type="number" value="1"> <br> <button id="run0">run</button> <button id="clear0">clear</button> <script src="sample_between.js"></script>
JavaScript
let btn0 = document.querySelector('#run0'), btn1 = document.querySelector('#clear0'), pre0 = document.querySelector('#output0'), input_x = document.querySelector('#x0'), input_y = document.querySelector('#y0'), input_z = document.querySelector('#z0'), inputs = [input_x, input_y, input_z], p = (x) => pre0.textContent += x + '\n', range = (start, end, step=1) => { let result = []; for (let i = start; i < end; i += step) { result.push(i); } return result; }; let isBetween = (x, y, z) => x <= y && y <= z; let output = () => { range(1, 3) .forEach((x) => range(1, 3) .forEach((y) => range(1, 3) .forEach((z) => p(`${x}, ${y}, ${z}: ${isBetween(x, y, z)}`) ) ) ); let [x, y, z] = inputs.map((input) => parseFloat(input.value)); p(`${x}, ${y}, ${z}: ${isBetween(x, y, z)}`); }; inputs.forEach((input) => input.onchange = output); btn0.onclick = output; btn1.onclick = () => pre0.textContent = ''; output();x = y = z =
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