slice是golang提供的乙個很好的符合型別。既支援資料動態擴充套件，又能隨機訪問，使資料保持很好的區域性性。但是slice有乙個效能可能導致資料的一致性和預期不一致，就是它會按需為slice收集記憶體。參考這段**：
package main
import "fmt"
func main() ? ? ?//what's the differenct to assign underlying or not
var data2 = [...]string //what's the differenct to assign underlying or not
inttest := 3
fmt.printf("inttest %%t after append is %t \n", inttest)
fmt.printf("inttest %%p after append is %p \n", inttest)
fmt.printf("data %%v is %v \n", data)
fmt.printf("data %%q is %q \n", data)
out := data[:0]
for _, s := range data
}fmt.printf("data %%v after append is %v \n", data)
fmt.printf("data %%q after append is %q \n", data)
fmt.printf("data %%s after append is %s \n", data)
fmt.printf("data %%t after append is %t \n", data)
fmt.printf("data %%p after append is %p \n", data)
fmt.printf("&data %%p after append is %p \n", &data)
fmt.printf("data2 %%t after append is %t \n", data2)
fmt.printf("data2 %%p after append is %p \n", data2)
fmt.printf("&data2 %%p after append is %p \n", &data2)
fmt.printf("&data2 %%d after append is %d \n", &data2)
fmt.printf("out %%v after append is %v \n", out)
fmt.printf("out %%q after append is %q \n", out)
out2 := append(data[:0], "a", "b", "c", "d")
fmt.printf("data %%v after append is %v \n", data)
fmt.printf("data %%q after append is %q \n", data)
fmt.printf("out2 %%v after append is %v \n", out2)
fmt.printf("out2 %%q after append is %q \n", out2)
out3 := append(data[:0], "a", "b", "c")
fmt.printf("data %%v after append is %v \n", data)
fmt.printf("data %%q after append is %q \n", data)
fmt.printf("out3 %%v after append is %v \n", out3)
fmt.printf("out3 %%q after append is %q \n", out3)
}output：
inttest %t after append is intinttest %p after append is %!p(int=3)data %v is [one? three]data %q is ["one" "" "three"]data %v after append is [one three three]data %q after append is ["one" "three" "three"]data %s after append is [one three three]data %t after append is stringdata %p after append is 0xc420062150&data %p after append is 0xc42007a020data2 %t after append is [3]stringdata2 %p after append is %!p([3]string=[one? three])&data2 %p after append is 0xc420062180&data2 %d after append is &[%!d(string=one) %!d(string=) %!d(string=three)]out %v after append is [one three]out %q after append is ["one" "three"]data %v after append is [one three three]data %q after append is ["one" "three" "three"]out2 %v after append is [a b c d]out2 %q after append is ["a" "b" "c" "d"]data %v after append is [a b c]data %q after append is ["a" "b" "c"]out3 %v after append is [a b c]out3 %q after append is ["a" "b" "c"]
從輸出裡我們可以得出兩條結論：
1. 對比第17行（append資料長度超出capacity）和第21行的輸出（append資料長度未超出capacity），slice在容量足夠的時候修改已有的array，在容量不夠的時候才realloc記憶體基於新的記憶體建立array
2. 對比第12行和9行，golang是強型別的，%p只對引用內型或者取位址有效
3. 對比第9行和第10行，golang對slice和&slice的值定義了不同的語義
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