Convert Numbers to Alphabetic Letters in Go

Understanding the need to convert numbers into alphabetic letters, let's explore various methods to achieve this in Go.

Number to Rune Conversion

A straightforward approach is to add the number to the constant 'A' - 1, where each number addition represents a letter in the alphabet. For example, adding 1 gives 'A', while adding 2 gives 'B'.

func toChar(i int) rune {
    return rune('A' - 1   i)
}

Number to String Conversion

If you prefer a string representation, simply convert the rune obtained from toChar using string().

func toCharStr(i int) string {
    return string('A' - 1   i)
}

Number to Cached String Conversion

For frequent conversions, a cached approach using an array or slice can improve efficiency.

var arr = [...]string{"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
    "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"}

func toCharStrArr(i int) string {
    return arr[i-1]
}

Number to String Conversion Using Const Slicing

Another efficient solution is to slice a string constant representing the alphabet.

const abc = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

func toCharStrConst(i int) string {
    return abc[i-1 : i]
}

These methods provide multiple options for converting numbers to alphabetic letters in Go, allowing you to select the one that best suits your requirements.