Count occurrences of a Character into a String

Given a String and a Character

let text = "Hello World"
let char: Character = "o"

We can count the number of times the Character appears into the String using

let sensitiveCount = text.characters.filter { $0 == char }.count // case-sensitive
let insensitiveCount = text.lowercaseString.characters.filter { $0 == Character(String(char).lowercaseString) } // case-insensitive

Found a mistake? Have a question or improvement idea? Let me know.

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