split a text by groups of three characters in swift

To split a text by groups of three characters in Swift, you can use a combination of String and Array functions. Here's a simple example:

main.swift
let text = "hello world"
var groups = [String]()

for i in stride(from: 0, to: text.count, by: 3) {
    let startIndex = text.index(text.startIndex, offsetBy: i)
    let endIndex = text.index(startIndex, offsetBy: 3, limitedBy: text.endIndex) ?? text.endIndex
    let group = String(text[startIndex..<endIndex])
    groups.append(group)
}

print(groups) // ["hel", "lo ", "wor", "ld"]
385 chars
12 lines

Here's what's happening:

1. We define a string text that we want to split into groups of three.
2. We create an empty array to hold our groups.
3. We use a for loop with a stride function to increment i by 3 in each iteration.
4. In each iteration, we calculate the startIndex and endIndex of the group.
5. We use the String initializer to extract the group from text.
6. We append the group to our array.
7. Finally, we print the array to verify our result.

This code should give you an array of strings, where each string contains 3 characters from the original text, except for the last group, which may contain fewer than 3 characters if the length of the text is not a multiple of 3.