Hi guys, I came across some code that surprised me, but I could not figured
out why it behave like this,
s := make([][]int, 0)
a1 := [3]int{1, 2, 3}
a2 := [3]int{4, 5, 6}
s = append(s, a1[:])
s = append(s, a2[:])
fmt.Println(s)
mp := make(map[[3]int]bool)
mp[[3]int{1, 2, 3}] = true
mp[[3]int{4, 5, 6}] = true
mp[[3]int{7, 8, 9}] = true
res := make([][]int, 0)
for k := range mp {
fmt.Printf("key is %+v\n", k[:])
res = append(res, k[:])
fmt.Printf("after append: %+v\n", res)
}
or on playground <https://play.golang.org/p/LicUSbr0g1a>
the output is:
[[1 2 3] [4 5 6]] // this is as expected
key is [1 2 3]
after append: [[1 2 3]]
key is [4 5 6]
after append: [[4 5 6] [4 5 6]] // Why it get this not [[1 2 3] [4 5 6]]
key is [7 8 9]
after append: [[7 8 9] [7 8 9] [7 8 9]] // why even this?
any thoughts?
Thanks!
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