內置函數append使用方式
看一下內置函數append在buildin.go中的註釋就知道了
// The append built-in function appends elements to the end of a slice. If
// it has sufficient capacity, the destination is resliced to accommodate the
// new elements. If it does not, a new underlying array will be allocated.
// Append returns the updated slice. It is therefore necessary to store the
// result of append, often in the variable holding the slice itself:
// slice = append(slice, elem1, elem2)
// slice = append(slice, anotherSlice...)
// As a special case, it is legal to append a string to a byte slice, like this:
// slice = append([]byte("hello "), "world"...)
func append(slice []Type, elems ...Type) []Type
註釋翻譯如下:
apeend內中函數是將元素添加到slice的末尾,如果容量足夠,目標元素被容納進切片。如果容量不足,一個新的底層數組將被分配,append函數返回結果是一個更新後的切片。因此,有必要將添加的結果存儲在通常包含切片本身的變量中。
append的使用方式:
slice = append(slice, elem)
slice = append(slice, elem1, elem2)
slice = append(slice, anotherSlice…) // 最後這三個點點點要加上,不然會報錯,這是用於兩個切片的合併的。
當然還有例外:
將string拼接到byte切片是合法的,例如
slice = append([]byte("hello "), “world”…)
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