题目内容

关于数组val a = Array(1,2,3)下列说法错误的是？

A. val b = 2 * a // b 等于 Array(2,4,6)
B. val b = a.map(_2) // b 等于 Array(2,4,6)
C. val b = for(elem <- a) yield 2 elem // b 等于 Array(2,4,6)
D. val b = for(elem <- a if elem % 2 == 0) yield 2 * elem // b 等于 Array(4)

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