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I am a newbie in Go. I can't find any official docs showing how to merge multiple strings into a new string.
What I'm expecting:
Input: "key:", "value", ", key2:", 100
Output: "Key:value, key2:100"
I want to use + to merge strings like in Java and Swift if possible.
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To concatenate a string to an int value, use the concatenation operator. Here is our int. int val = 3; Now, to concatenate a string, you need to declare a string and use the + operator.
Concatenation is the process of appending one string to the end of another string. You concatenate strings by using the + operator. For string literals and string constants, concatenation occurs at compile time; no run-time concatenation occurs. For string variables, concatenation occurs only at run time.
In JavaScript, we can assign strings to a variable and use concatenation to combine the variable to another string. To concatenate a string, you add a plus sign+ between the strings or string variables you want to connect. let myPet = 'seahorse'; console.
I like to use fmt's Sprintf method for this type of thing. It works like Printf in Go or C only it returns a string. Here's an example:
output := fmt.Sprintf("%s%s%s%d", "key:", "value", ", key2:", 100) Go docs for fmt.Sprintf
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You can use strings.Join, which is almost 3x faster than fmt.Sprintf. However it can be less readable.
output := strings.Join([]string{"key:", "value", ", key2:", strconv.Itoa(100)}, "") See https://play.golang.org/p/AqiLz3oRVq
strings.Join vs fmt.Sprintf
BenchmarkFmt-4 2000000 685 ns/op BenchmarkJoins-4 5000000 244 ns/op Buffer
If you need to merge a lot of strings, I'd consider using a buffer rather than those solutions mentioned above.
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