回答編集履歴
6
修正
test
CHANGED
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@@ -60,9 +60,9 @@
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60
60
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61
61
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62
62
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63
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-
console.log(countTo
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63
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+
console.log(countToArrays);
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64
64
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65
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-
console.log(countTo
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65
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console.log(countToArrays[2]);
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66
66
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67
67
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```
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68
68
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5
修正
test
CHANGED
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@@ -68,7 +68,7 @@
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68
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69
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70
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71
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-
さらにBabelでコンパイルする前提なら， countTo
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71
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+
さらにBabelでコンパイルする前提なら， countToArrays の生成時に
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72
72
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73
73
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74
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4
修正
test
CHANGED
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@@ -24,15 +24,15 @@
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24
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25
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26
26
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27
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-
const
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27
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+
const serials = groups.map(JSON.stringify);
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29
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30
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31
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-
const
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31
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+
const serialToCount = serials.reduce(
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32
32
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33
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(map,
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33
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(map, serial) => (
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34
34
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35
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map[
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35
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+
map[serial] = (map[serial] || 0) + 1,
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36
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map
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38
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@@ -44,11 +44,11 @@
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45
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46
46
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47
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-
const countTo
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const countToArrays = Object.keys(serialToCount).reduce(
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48
48
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49
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-
(map,
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49
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+
(map, serial) => (
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50
50
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51
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-
(map[
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51
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(map[serialToCount[serial]] = map[serialToCount[serial]] || []).push(JSON.parse(serial)),
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52
52
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53
53
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map
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54
54
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@@ -74,11 +74,11 @@
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74
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75
75
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```JavaScript
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76
76
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77
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-
const countTo
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77
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+
const countToArrays = Object.entries(serialToCount).reduce(
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78
78
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79
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-
(map, [
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79
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+
(map, [serial, count]) => (
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80
80
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81
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(map[count] = (map[count] || [])).push(
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81
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(map[count] = (map[count] || [])).push(JSON.parse(serial)),
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82
82
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83
83
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map
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84
84
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3
Babel
test
CHANGED
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@@ -92,6 +92,6 @@
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92
92
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93
93
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94
94
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95
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-
として分割代入を使ったほうがきれいですね．
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95
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+
として`Object.entries`と分割代入を使ったほうがきれいですね．
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96
96
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97
97
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2
Babel
test
CHANGED
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@@ -58,4 +58,40 @@
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58
58
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59
59
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);
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60
60
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61
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+
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62
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63
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console.log(countToChars);
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64
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65
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console.log(countToChars[2]);
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66
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61
67
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```
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68
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69
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+
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70
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+
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71
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+
さらにBabelでコンパイルする前提なら， countToChars の生成時に
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72
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73
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74
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75
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```JavaScript
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76
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77
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const countToChars = Object.entries(charToCount).reduce(
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78
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79
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(map, [char, count]) => (
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80
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81
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(map[count] = (map[count] || [])).push(char),
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82
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83
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map
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84
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+
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85
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),
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86
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+
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87
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{}
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88
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+
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89
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+
);
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90
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91
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```
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92
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+
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93
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+
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94
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+
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95
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+
として分割代入を使ったほうがきれいですね．
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96
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+
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97
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+
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1
冗長
test
CHANGED
|
@@ -48,7 +48,7 @@
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48
48
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49
49
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(map, char) => (
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50
50
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51
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-
(map[charToCount[char]] =
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51
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+
(map[charToCount[char]] = map[charToCount[char]] || []).push(char),
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52
52
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53
53
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map
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54
54
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