開発環境
- macOS Sierra - Apple (OS)
- Emacs (Text Editor)
- JavaScript (プログラミング言語)
- Safari(Web browser)
Head First JavaScript Programming (Eric T. Freeman (著)、Elisabeth Robson (著)、O'Reilly Media)の Chapter 10.(Liberated functions - First Class Functions)の EXERCISE(No. 6850)を取り組んでみる。
EXERCISE(No. 6850)
コード(Emacs)
HTML5
<pre id="output0"></pre> <button id="run0">run</button> <button id="clear0">clear</button> <script src="sample6.js"></script>
JavaScript
let btn0 = document.querySelector('#run0'), btn1 = document.querySelector('#clear0'), pre0 = document.querySelector('#output0'), p = (x) => pre0.textContent += x + '\n', range = (start, end, step=1) => { let result = []; for (let i = start; i < end; i += 1) { result.push(i); } return result; }; let compareNumbersDesc = (num1, num2) => { if (num2 > num1) { return 1; } if (num1 === num2) { return 0; } return -1; }; let output = () => { let nums = range(0, 10).map(() => Math.floor(Math.random() * 20)); p(nums); nums.sort(compareNumbersDesc); p(nums); }; let clear = () => pre0.textContent = ''; btn0.onclick = output; btn1.onclick = clear; output();
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