-- Phase 1 inline lambdas: pass a `(params>ret;body)` literal to a HOF
-- instead of defining a one-off top-level helper.
--
-- Phase 1 does NOT capture enclosing scope. The body's free variables must
-- all be params, locals, or known fns. To thread external state in, use the
-- HOF's ctx-arg form (`srt fn ctx xs`) which already works for named fns.
-- Closure capture is the Phase 2 follow-up — ILO-P017 spells out the path.
-- Sort numbers by distance from zero (would have needed a `dist` helper).
by-dist xs:L n>L n;srt (x:n>n;abs x) xs
-- Sort words by length (would have needed a `wlen` helper).
by-len ws:L t>L t;srt (s:t>n;len s) ws
-- Filter to non-empty strings (would have needed an `nempty` predicate).
-- Note the parens around `len s`: prefix-binops take atoms, so the inner
-- call needs grouping. Same rule as anywhere else in ilo.
nonempty ws:L t>L t;flt (s:t>b;>(len s) 0) ws
-- Sum of squares via inline accumulator (would have needed a `sqacc` helper).
sumsq xs:L n>n;fld (a:n x:n>n;+a *x x) xs 0
-- run: by-dist [-3,1,-5,2]
-- out: [1, 2, -3, -5]
-- run: by-len ["banana","fig","apple","kiwi"]
-- out: [fig, kiwi, apple, banana]
-- run: nonempty ["a","","b","","c"]
-- out: [a, b, c]
-- run: sumsq [1,2,3,4]
-- out: 30