This document details iteration #6 of the doppl programming language development, focusing on the introduction of the string concatenation operator, which allows for concatenating literal strings and initialized strings. It emphasizes that in doppl, characters are treated as strings, with no distinction made between them. Future iterations are suggested to introduce additional functionalities, including standard input/output and various operators.

1. DOPPL
Data Oriented Parallel Programming Language
Development Diary
Iteration #6
Covered Concepts:
String Concatenation Operator
Diego PERINI
Department of Computer Engineering
Istanbul Technical University, Turkey
2013-08-09
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2. Abstract
This paper stands for Doppl language development iteration #6. In this paper, string
concatenation operator will be introduced.
1. Rationale
As a high level language, Doppl characters are also strings therefore there is no distinction
between string concatenation and character appending.
2. String Concatenation Operator
keyword
meaning
++
string concatenation
++ operator can concatenate any string literal with any initialized string as well as can be used
to chain multiple concatenations. Null literal is not considered as a valid string therefore cannot be
concatenated. Below is an example source code.
#String Concatenation
task(1) Strings {
data a_string = string
#Examples
init: {
a_string = "Hello"
a_string = a_string ++ " World" ++ "!"
}
}
3. Conclusion
Iteration #6 introduces string concatenation operator and stresses the fact that there is no
distinction between a character and a string in terms of Doppl types.
4. Future Concepts
Below are the concepts that are likely to be introduced in next iterations.
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Standard input and output
once access modifier
if conditional and trueness
State transition operators
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Primitive Collections and basic collection operators
Provision operators
Tasks as members
Task and data traits
Custom data types and defining traits
Built-in traits for primitive data types
Message passing
Exception states
5. License
CC BY-SA 3.0
http://creativecommons.org/licenses/by-sa/3.0/
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