回答編集履歴
1
omake
test
CHANGED
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@@ -92,3 +92,61 @@
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92
92
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- [分割代入 - JavaScript | MDN](https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment)
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93
93
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- [Array.prototype.flatMap() - JavaScript | MDN](https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Global_Objects/Array/flatMap)
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- [.formatDate() | Class Utilities | Apps Script - Google Developers](https://developers.google.com/apps-script/reference/utilities/utilities#formatdatedate,-timezone,-format)
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96
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---
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97
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98
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### おまけ：アロー関数を使わずにかく
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99
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`searchNeedleInHaystack3()`関数の以下の1行を、アロー関数を使わずに、かみくだいた書き方で3種類ほどご用意しました。
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100
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理解の助けになれば幸いです。
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101
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102
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```javascript
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const result = needles.map(n => haystack.some(h => h - n === 0) ? ['●'] : ['']);
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```
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106
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##### アロー関数やめてみる
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107
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```javascript
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108
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const result = needles.map(function(n) {
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109
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const isExists = haystack.some(function(h) {
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return h - n === 0;
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});
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return isExists === true ? ['●'] : [''];
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});
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```
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##### 三項演算子やめてみる
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```javascript
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const result = needles.map(function(n) {
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120
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const isExists = haystack.some(function(h) {
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121
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return h - n === 0;
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});
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if (isExists === true) {
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return ['●'];
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} else {
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127
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return [''];
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128
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}
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});
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```
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##### `.map()`さえやめてみる
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133
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```javascript
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const result = [];
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135
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for (let n=0; n<needles.length; n++) {
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let flag;
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for (let h=0; h<haystack.length; h++) {
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139
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const diff = haystack[h] - needles[n];
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140
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if (diff === 0) {
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flag = true;
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break;
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}
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}
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if (flag === true) {
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result.push(['●']);
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} else {
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149
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result.push(['']);
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150
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}
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}
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```
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