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.map を利用して let でランダム数列を作る ref: http://qiita.com/lovee/items/f3515119883f05a8dac5
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| let randomIntArray = [Int](count: 10, repeatedValue: 0).map { (some: Int) -> Int in | |
| let randomUInt = arc4random_uniform(100) // 0 ..< 100 の乱数を作る | |
| return Int(randomUInt) - 50 | |
| } |
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| [Int](0 ..< 10) |
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