How to Convert a Go []int Slice to a Delimited String in One Line?

One-Line Transformation of []int to String with Delimiter

In Go, it is possible to convert a slice of integers ([]int) to a string with a custom delimiter in a single line of code. Consider the need to transform []int{1, 2, 3} into "1, 2, 3" with a delimiter of choice.

A comprehensive solution that leverages multiple string manipulation functions is available:

strings.Trim(strings.Replace(fmt.Sprint(A), " ", delim, -1), "[]")

This line of code performs the following operations:

1. Uses fmt.Sprint(A) to convert the slice to a string.
2. Replaces spaces in the string with the specified delimiter using strings.Replace(..., delim, -1). The -1 parameter ensures replacements throughout the string.
3. Strips leading and trailing square brackets using strings.Trim(...).

Alternative one-liners include:

strings.Trim(strings.Join(strings.Fields(fmt.Sprint(A)), delim), "[]")

strings.Trim(strings.Join(strings.Split(fmt.Sprint(A), " "), delim), "[]")

These variants employ different string manipulation methods to achieve the same result.

To incorporate a space after the delimiter, use arrayToString(A, ", ") or define the return statement as:

return strings.Trim(strings.Replace(fmt.Sprint(a), " ", delim + " ", -1), "[]")

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