string.elsa

struct String {
	char[] str;

	fn CharAt(int i) : char {
		return str[i];
	}

	fn Length() : int {
		return str.Length();
	}

	fn Concat(String other) : String {
		var newStr = new String {
			str: new char[Length() + other.Length()]
		};

		for(var i = 0; i < Length(); i++) {
			newStr.str.Push(str[i]);
		}
		
		for(var i = 0; i < other.Length(); i++) {
			newStr.str.Push(other.str[i]);
		}

		return newStr;
	}

	fn Substring(int startIndex, int length) : String {
		var newStr = new String {
			str: new char[length]
		};

		// TODO: Error checking, validate start and length
		int stopIndex = startIndex + length;
		for(var i = startIndex; i < stopIndex; i++) {
			newStr.str.Push(str[i]);
		}

		return newStr;
	}

	fn Equals(String other) : bool {
		if(Length() != other.Length()) {
			return false;
		}
	
		for(var i = 0; i < Length(); i++) {
			if(str[i] != other.str[i]) {
				return false;
			}
		}
	
		return true;
	}
};