Convert unicode code point to literal character in Go

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You can use the strconv.Unquote() and strconv.UnquoteChar() functions to do the conversion.

One thing you should be aware of is that strconv.Unquote() can only unquote strings that are in quotes (e.g. start and end with a quote char " or a back quote char `), so we have to manually append that.

See this example:

lines := []string{
    `\u0053`,
    `\u0075`,
    `\u006E`,
}
fmt.Println(lines)

for i, v := range lines {
    var err error
    lines[i], err = strconv.Unquote(`"` + v + `"`)
    if err != nil {
        fmt.Println(err)
    }
}
fmt.Println(lines)

fmt.Println(strconv.Unquote(`"Go\u0070\x68\x65\x72"`))

Output (try it on the Go Playground):

[\u0053 \u0075 \u006E]
[S u n]
Gopher <nil>

If the strings you want to unquote contain the escape sequence of a single rune (or you just want to unquote the first rune), you may use strconv.UnquoteChar(). This is how it looks like (note: no quoting of the input is needed in this case, like it was needed for strconv.Unquote()):

runes := []string{
    `\u0053`,
    `\u0075`,
    `\u006E`,
}
fmt.Println(runes)

for _, v := range runes {
    var err error
    value, _, _, err := strconv.UnquoteChar(v, 0)
    if err != nil {
        fmt.Println(err)
    }
    fmt.Printf("%c\n", value)
}

This will output (try it on the Go Playground):

[\u0053 \u0075 \u006E]
S
u
n

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