Variable declaration reset: Difference between revisions

Also... J's control words (like '<tt>while.</tt>') do not create new variable scopes. Given J's scoping rules, if J introduced new variable scopes for control words, that would prevent updates inside those blocks from being visible outside those blocks (unless we also added new scoping rules for that case -- a major engine upgrade -- or used non-local variables, such as J's "locales" which are probably out of scope for this task...). Where J's block scope isolation is desirable, we can use nested functions (J's verbs, adverbs or conjunctions).