As part of the changes, this is one of the most welcomed changes. This change eliminates the necessity for a characters array on String, which means now you can reverse them, loop over them character-by-character, map() and flatMap() them, and more than anything, you can now iterate directly over a String object:
let vowels = "AEIOU"for char in vowels { print(char)}
This prints the following:
A , E , I , O, U
Here, you not only get logical iteration through String, but also specific understanding for collection and sequence:
vowels.count , result is 5, no need of vowels.characters.countvowels.isEmpty , result is falsevowels.dropFirst() , result is "EIOU"String(vowels.reversed()) , result is "UOIEA"
There is a ...
