StringInquirer.swift

/**
 Inspired by rails `StringInquirer`
 https://github.com/rails/rails/blob/master/activesupport/lib/active_support/string_inquirer.rb
**/

@dynamicMemberLookup
struct StringInquirer {
    
    let string: String
    
    init(_ string: String) { self.string = string }
    
    subscript(dynamicMember member: String) -> Bool {
        return string == member
    }
    
}

extension String {
    var `is`: StringInquirer {
        return StringInquirer(self)
    }
}

"mack".is.mack  // true
"mack".is.jack  // false