How to Convert Numbers to Alphabet in Go?

Go: Translating Numbers to Alphabet

Converting numbers into their alphabetical representations can be a quick and easy task in Go. By utilizing various methods, we can cater to different performance requirements and output formats. Let's explore the most straightforward approaches:

Converting Number to Rune

Simply adding the number to the constant 'A' - 1 will shift the character codes, enabling the retrieval of the corresponding letters. For instance, adding 1 returns the rune for 'A', while adding 23 results in the rune for 'W'.

<code class="go">func toChar(i int) rune {
    return rune('A' - 1 + i)
}</code>

Converting Number to String

To obtain the letter as a string, we can modify the previous function:

<code class="go">func toCharStr(i int) string {
    return string('A' - 1 + i)
}</code>

Converting Number to String (Cached)

For performance-intensive applications, caching the strings in an array can save time by avoiding repeated conversion.

<code class="go">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]
}</code>

Converting Number to String (String Constant Slicing)

An efficient solution for string conversion involves slicing a predefined string constant:

<code class="go">const abc = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

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

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