回答編集履歴
8
a
answer
CHANGED
@@ -62,4 +62,18 @@
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62
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}));
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console.log('[all done]');
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})().catch(e => console.error(e));
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65
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+
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+
/*
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+
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68
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coを使うけどよりPromiseやasync/awaitとの親和性を高くして書く場合もこのように
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70
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co(function* () {
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yield Promise.all(keys.map(value => co(function* () {
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yield sleep(Math.round(Math.random()*10000));
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console.log('done: ' + value);
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})));
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console.log('[all done]');
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}).catch(e => console.error(e));
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+
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*/
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65
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```
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7
a
answer
CHANGED
@@ -44,3 +44,22 @@
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44
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}).catch(e => console.error(e));
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```
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47
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+
Babelでコンパイルする前提でasync/awaitを使うなら
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48
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49
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```JavaScript
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50
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'use strict';
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51
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function sleep(ms) {
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return new Promise(resolve => setTimeout(resolve, ms));
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}
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const keys = ['a','b','c','d','e','f','g','h','i','j','k','l'];
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+
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(async () => {
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await Promise.all(keys.map(async value => {
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await sleep(Math.round(Math.random()*10000));
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console.log('done: ' + value);
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}));
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console.log('[all done]');
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64
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})().catch(e => console.error(e));
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65
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```
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6
a
answer
CHANGED
@@ -36,10 +36,11 @@
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const keys = ['a','b','c','d','e','f','g','h','i','j','k','l'];
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co(function* () {
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39
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-
yield keys.map(
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yield keys.map(function* (value) {
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yield sleep(Math.round(Math.random()*10000));
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console.log('done: ' + value);
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});
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console.log('[all done]');
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}).catch(e => console.error(e));
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45
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-
```
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45
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+
```
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46
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+
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5
a
answer
CHANGED
@@ -17,7 +17,7 @@
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17
17
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Promise.all(keys.map(
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18
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value => sleep(Math.round(Math.random()*10000)).then(() => console.log('done: ' + value))
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)).then(
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-
() => console.log('
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() => console.log('[all done]'), // すべてresolveされた
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e => console.error(e) // ひとつでもrejectされた,または例外がスローされた
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);
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```
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@@ -40,6 +40,6 @@
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40
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yield sleep(Math.round(Math.random()*10000));
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console.log('done: ' + value);
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});
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43
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-
console.log('
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43
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console.log('[all done]');
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44
44
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}).catch(e => console.error(e));
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45
45
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```
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4
a
answer
CHANGED
@@ -3,6 +3,7 @@
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3
3
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- [MDN - Promise.all()](https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Global_Objects/Promise/all)
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4
4
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5
5
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せっかくなのでES6の機能ふんだんに使って書きます.
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6
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+
(Node.jsということなので,特にブラウザの互換性のような問題も気にしなくていいと思います)
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6
7
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7
8
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```JavaScript
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8
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'use strict';
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3
a
answer
CHANGED
@@ -8,14 +8,13 @@
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8
8
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'use strict';
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9
9
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10
10
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function sleep(ms) {
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11
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-
return new Promise(
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11
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+
return new Promise(resolve => setTimeout(resolve, ms));
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12
12
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}
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14
14
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const keys = ['a','b','c','d','e','f','g','h','i','j','k','l'];
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16
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Promise.all(keys.map(
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17
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-
value => sleep(Math.round(Math.random()*10000))
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18
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-
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17
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+
value => sleep(Math.round(Math.random()*10000)).then(() => console.log('done: ' + value))
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19
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)).then(
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() => console.log('finished'), // すべてresolveされた
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21
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e => console.error(e) // ひとつでもrejectされた,または例外がスローされた
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@@ -30,7 +29,7 @@
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30
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const co = require('co');
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31
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32
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function sleep(ms) {
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33
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-
return new Promise(
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32
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+
return new Promise(resolve => setTimeout(resolve, ms));
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34
33
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}
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35
34
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36
35
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const keys = ['a','b','c','d','e','f','g','h','i','j','k','l'];
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2
a
answer
CHANGED
@@ -7,17 +7,39 @@
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7
7
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```JavaScript
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8
8
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'use strict';
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9
9
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10
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+
function sleep(ms) {
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11
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return new Promise(r => setTimeout(r, ms));
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12
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}
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13
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+
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10
14
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const keys = ['a','b','c','d','e','f','g','h','i','j','k','l'];
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11
15
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12
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-
Promise.all(
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16
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Promise.all(keys.map(
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13
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-
keys.map(value => new Promise(
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14
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-
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17
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value => sleep(Math.round(Math.random()*10000))
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15
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-
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18
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.then(() => console.log('done: ' + value))
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16
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-
resolve(); // ここではすべてresolveする
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17
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-
}, Math.round(Math.random()*10000))
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18
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-
))
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19
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-
).then(
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19
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+
)).then(
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20
20
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() => console.log('finished'), // すべてresolveされた
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21
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-
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21
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+
e => console.error(e) // ひとつでもrejectされた,または例外がスローされた
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22
22
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);
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23
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+
```
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24
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+
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25
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+
co+Generatorを使うならもう少し見やすくかけますね.
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26
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+
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27
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+
```JavaScript
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28
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+
'use strict';
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29
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+
|
30
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+
const co = require('co');
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31
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+
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32
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+
function sleep(ms) {
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33
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+
return new Promise(r => setTimeout(r, ms));
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34
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}
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35
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+
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36
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+
const keys = ['a','b','c','d','e','f','g','h','i','j','k','l'];
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37
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+
|
38
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co(function* () {
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39
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+
yield keys.map(value => function* () {
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40
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+
yield sleep(Math.round(Math.random()*10000));
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41
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+
console.log('done: ' + value);
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42
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});
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43
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+
console.log('finished');
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44
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+
}).catch(e => console.error(e));
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23
45
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```
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1
a
answer
CHANGED
@@ -11,10 +11,13 @@
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11
11
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12
12
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Promise.all(
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13
13
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keys.map(value => new Promise(
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14
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-
resolve => setTimeout(() => {
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14
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+
(resolve, reject) => setTimeout(() => {
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15
15
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console.log('done: ' + value);
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16
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-
resolve();
|
16
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+
resolve(); // ここではすべてresolveする
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17
17
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}, Math.round(Math.random()*10000))
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18
18
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))
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19
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+
).then(
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19
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-
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20
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+
() => console.log('finished'), // すべてresolveされた
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21
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+
() => console.error('failed') // ひとつでもrejectされた,または例外がスローされた
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22
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+
);
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20
23
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```
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