题目内容

下述方法中，哪一个不能将"val tmp = List(1, 2, 3)"中的所有元素求和，并将最终结果6返回？

A. tmp.foldLeft(0)(_ + _)
B. tmp.reduceLeft(_ + _)
C. (0 /: tmp)(_ + _)
D. tmp.scanLeft(0)(_ + _)

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Scala语言中，关于List的定义。不正确的是？

A. val list = List(1,2,3)
B. val list = List[Int](1,2,3)
C. val list = List[String](‘a’,’b’,’c’)
D. val list = List[String]()

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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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Dose the writer support the idea that "one's personality can be summed up in a word"? ( Para.2 ) What evidence in the text can you find to support your answer?

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Of the two main factors (heredity and environment) that influence one's personality, which one has a greater influence?

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下述方法中，哪一个不能将"val tmp = List(1, 2, 3)"中的所有元素求和，并将最终结果6返回？

A. tmp.foldLeft(0)(_ + _) B. tmp.reduceLeft(_ + _) C. (0 /: tmp)(_ + _) D. tmp.scanLeft(0)(_ + _)

Scala语言中，关于List的定义。不正确的是？

关于数组val a = Array(1,2,3)下列说法错误的是？

Dose the writer support the idea that "one's personality can be summed up in a word"? ( Para.2 ) What evidence in the text can you find to support your answer?

Of the two main factors (heredity and environment) that influence one's personality, which one has a greater influence?

A. tmp.foldLeft(0)(_ + _)
B. tmp.reduceLeft(_ + _)
C. (0 /: tmp)(_ + _)
D. tmp.scanLeft(0)(_ + _)