j-language

This article introduces methods for generating playing cards, dealing cards, and shuffling in the J language using catalog operator, transpose, random number functions, and permutation functions.

This article reviews a Scheme interpreter implemented in J, explaining the tokenizer and recursive descent parser code.

This article demonstrates how to model the COVID-19 outbreak using the SEIRS model implemented in the J programming language, explaining the states and variables involved.

This article introduces how to build a simple sprite editor in the J language, covering window management, grid drawing, keyboard shortcuts, mouse drawing, and palette customization, demonstrating the core techniques of interactive graphics programs.