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@@ -0,0 +1,27 @@
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+/**
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+测试golang slice扩展长度的规则
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+
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+结论, slice cap空间够的时候，cap不变，cap不够的时候，会乘2.
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+*/
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+package main
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+
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+import "fmt"
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+
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+func main() {
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+ var ary = make([]int, 1, 1)
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+
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+ ary[0] = 1
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+ fmt.Printf("value: %v, len: %v, cap: %v\n", ary, len(ary), cap(ary))
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+
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+ ary = append(ary, 2)
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+ fmt.Printf("value: %v, len: %v, cap: %v\n", ary, len(ary), cap(ary))
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+
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+ ary = append(ary, 3)
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+ fmt.Printf("value: %v, len: %v, cap: %v\n", ary, len(ary), cap(ary))
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+
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+ ary = append(ary, 4)
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+ fmt.Printf("value: %v, len: %v, cap: %v\n", ary, len(ary), cap(ary))
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+
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+ ary = append(ary, 5)
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+ fmt.Printf("value: %v, len: %v, cap: %v\n", ary, len(ary), cap(ary))
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+}
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