dongzhong7443
dongzhong7443
2015-07-15 09:15

Golang sort.Swap方法

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I am fairly new to Golang, although I have already written some lines of code. I was exploring the sorting options when I found this(src):

func (p StringSlice) Swap(i, j int)      { p[i], p[j] = p[j], p[i] }

I have no clue what is it going on there. Could someone explain to me what p[i], p[j] = p[j], p[i] is doing?

Thanks.

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2条回答

  • dtjxhf595733 dtjxhf595733 6年前

    It does what its name says: it swaps the ith and jth elements.

    It is an assignment, more specifically a tuple assignment:

    p[i], p[j] = p[j], p[i]
    

    It assigns values to p[i] and p[j], and the values that are assigned to them in order are p[j] and p[i].

    The assignment proceeds in two phases. First, the operands of index expressions and pointer indirections (including implicit pointer indirections in selectors) on the left and the expressions on the right are all evaluated in the usual order. Second, the assignments are carried out in left-to-right order.

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  • duanguan3863 duanguan3863 5年前

    here in golang, we dont need a tmp variable. It will assign directly with line p[i], p[j] = p[j], p[i]

    it is one of miracles in golang Enjoy!

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