回答編集履歴
1
Refactor code
answer
CHANGED
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@@ -9,22 +9,24 @@
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9
9
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// Create an array like:
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10
10
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// [0, 1, 2, 3, 4, 5, 4, 3, 2, 1]
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11
11
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createUpDownCyclesArray = function(cycleLength) {
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12
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-
arrayCombine = function(incrementalArray, decrementalArray) {
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13
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-
decrementalArray.shift()
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14
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decrementalArray.pop()
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15
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-
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16
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return incrementalArray.concat(decrementalArray)
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17
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}
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18
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-
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19
12
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// Create an array like:
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20
13
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// [0, 1, 2, 3, 4, 5]
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21
14
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incrementalArray =
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22
15
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Array.apply(null, Array(cycleLength + 1))
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23
16
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.map(function(_, i) { return i })
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24
17
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18
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+
// Create an array like:
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19
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// [0, 1, 2, 3, 4, 5] => [4, 3, 2, 1]
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20
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decrementalArray =
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21
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(function(incrementalArray){
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25
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-
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22
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+
decrementalArray = incrementalArray.slice().reverse()
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23
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decrementalArray.shift()
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24
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decrementalArray.pop()
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26
25
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26
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return decrementalArray
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27
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})(incrementalArray)
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28
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+
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27
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-
return
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29
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return incrementalArray.concat(decrementalArray)
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28
30
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}
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29
31
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30
32
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self = this // for refer outer context of `this` from inner context
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