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Languages & runtimes · #rexx
Learn how to diagnose and fix silent logic failures in Rexx, including uninitialized variable behavior, PARSE instruction errors, and global scope collisions.
Learn how Rexx's PARSE instruction replaces manual scanning loops with a declarative template, and see a worked CSV example you can run today.
A concise architecture note on using REXX CALL to invoke external programs, covering requirements, minimal design, trust boundaries, operational checks, failure modes, and when the design should evolve.
Learn how to use the Rexx PARSE statement to efficiently split delimited strings into named variables, including handling empty fields and dynamic field counts.
Deciding between PARSE and SUBSTR in Rexx depends on whether your data is delimited or fixed-width. Learn when to use pattern-based extraction versus positional slicing for maintainable code.
Learn how to efficiently split strings and tokenize data in Rexx using the CALL PARSE instruction, including practical stem variable examples and common pitfalls.
Learn how to use Rexx stem variables and the PARSE instruction to create dynamic associative arrays for rapid prototyping and efficient data mapping.
Explains how Rexx's NUMERIC DIGITS and FUZZ provide exact decimal arithmetic for financial calculations, covering requirements, trust boundaries, checks, failure modes, and when to reconsider the design.
Learn how to use Rexx stem variables as indexed lists: set a stem default, store the count in tail 0, iterate with a DO loop, and avoid common pitfalls like unset tails and stem‑wide drops.