How to Convert Numbers to Alphabetic Letters in Go?

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'.

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

Number to String Conversion

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

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

Number to Cached String Conversion

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

<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>

Number to String Conversion Using Const Slicing

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

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

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

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

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