langur

Langur is an open-source imperative/functional scripting language written by Anthony Davis. Its principles of design are sensibility to humans, accuracy in calculation, and a clean, expressive syntax.

Influences include the following languages, and likely many others.

Perl, C#, Go, C, SQL ... and Thorsten Ball's Monkey language, which was the starting point

• download langur
• Windows installation instructions
• Linux installation instructions
• source code examples

The following is a partial list of langur's features.

• highly expressive given expressions (langur's “switch”)
• semi-integrated regex
• decimal floating point for numbers
• number constants pi, phi, e, n2, n10
• optional integer basex notation for any base from 2 to 36, such as -16xFF or 2x1010_0010
• automated for loop over an array or string, or over a range
• first-order functions, including closures
• immutable or mutable declarations
• decoupling assignments
• block quote (similar to a "HEREDOC")
• indexing strings by code point
• indexing by arrays
• exponent and root operators
• optional database operators
• catching exceptions without explicit try blocks
• useful built-in functions such as map(), fold(), foldfrom(), where()
• a read() function that validates input

books

I initially developed langur following very useful books by Thorsten Ball (1, 2), but I've made many changes and additions.

I wrote langur to develop skills for another programming project. In the meantime, I wrote a book, explaining how some of langur's advanced features are designed to work in the stack-based virtual machine. See a free preview chapter at opcodebook.com.