langur

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

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

• highly flexible “given” expression (langur's “switch”)
• semi-integrated regex
• useful built-in functions such as map(), fold(), foldfrom(), where(), group()
• a read() function that validates input
• decimal floating point for numbers
• optional basex notation, such as -16xFF or 2x1010_0010
• immutable or mutable declarations
• 1-based indexing
• inclusive ranges
• first-order functions
• indexing strings by code point
• indexing by arrays
• exponent and root operators
• short-circuiting operators
• optional database operators
• catching exceptions without explicit try blocks
• string interpolation

Langur was initially developed following Writing an Interpreter in Go and Writing a Compiler in Go, with many features added and changes made.

Please browse the features of langur by following the navigation links.

download

langur 0.3.6 alpha source code (7-Zip, 92K, July 18, 2019)

Langur uses the Apache license 2.0.

Constructive feeback is welcome.

A full revision history is included in the README.md file.

2018-07-18 - 0.3.6 alpha - added group() function to group array elements into separate arrays - updated checking for sameness so that 1.0 is different than 1 (but they are still equal) This affects composite comparisons.