Webtagr - Technology News Summarizer

Emulating Closures in Tcl: A Clever Hack

2025-05-03

This article explores implementing closure-like behavior in Tcl, a language lacking native closure support. The author cleverly leverages namespaces and the TclOO object system to create a class that mimics closures. This class captures external variables and maintains their validity outside their original scope, effectively achieving closure-like functionality. While differing slightly from C++ closures, this approach provides a practical solution for those needing closures in Tcl.

A Common Lisp jq Replacement: cljq

2025-05-02

Tired of jq's convoluted DSL? Meet cljq, a jq replacement written in Common Lisp. cljq uses a more intuitive query operator, `?`, offering JSONPath-like functionality for simplified JSON manipulation. Currently in early stages, cljq already provides basic functionality with plans for future feature additions.

Keyword Parameters in Tcl Procs: An Elegant Solution and a Metaprogramming Headache

2025-04-21

Frustrated by the lack of keyword parameters and the inaccessibility of built-in features in some programming languages, the author tackled the challenge of implementing keyword parameters in Tcl. The article presents a clever `proc*` command enabling keyword arguments in Tcl procs and details its implementation. However, due to Tcl's weak metaprogramming capabilities, the author resorted to regular expressions for string templating, resulting in complex and unwieldy code, highlighting Tcl's limitations in metaprogramming.