a function that returns true if a string is camelcase in swift

main.swift
func isCamelCase(_ input: String) -> Bool {
    // Check if the first character is not uppercase
    guard let firstChar = input.first, firstChar.isUppercase else {
        return false
    }
    
    // Check if any characters are uppercase
    let uppercaseLetters = input.filter { $0.isUppercase }
    
    return uppercaseLetters.count > 0
}
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main.swift
let string1 = "helloWorld"   // camelCase
let string2 = "HelloWorld"   // PascalCase
let string3 = "helloworld"   // invalid case
let string4 = "hello_World"  // invalid case

print(isCamelCase(string1))  // Output: true
print(isCamelCase(string2))  // Output: false
print(isCamelCase(string3))  // Output: false
print(isCamelCase(string4))  // Output: false
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