Golang在字符串切片中追加字符串

Question

How to append string in a string sclice? I tried

s := make([]string, 1, 4)
s[0] = "filename"
s[0] := append(s[0], "dd")

But it is not correct. Then I tried

s[:1] := append(s[:1], "dd")

But it is not correct either.

How can I append a string to s[0]?

Answer 1

The builtin append() function is for appending elements to a slice. If you want to append a string to a string, simply use the concatenation +. And if you want to store the result at the 0th index, simply assign the result to it:

s[0] = s[0] + "dd"

Or short:

s[0] += "dd"

Note also that you don't have to (can't) use := which is a short variable declaration, since your s slice already exists.

fmt.Println(s) output:

[filenamedd]

If you want to append to the slice and not to the first element, then write:

s = append(s, "dd")

fmt.Println(s) output (continuing the previous example):

[filenamedd dd]

Try these on the Go Playground.