Loops/Increment loop index within loop body: Difference between revisions
Loops/Increment loop index within loop body (view source)
Revision as of 08:31, 29 September 2023
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===With indexed loop word===
Quackery has an iterative looping word that can change its step size mid-iteration (see [[Loops/For with a specified step#Quackery]]) but it is not well suited to this task. A better solution (i.e. more idiomatic) is to define a new looping word, <code>from</code>, that exactly meets the specification of the task.
<syntaxhighlight lang="Quackery"> [ stack ] is f.action ( --> s )
[ stack ] is f.end ( --> s )
[ stack ] is f.incr ( --> s )
[ stack ] is f.index ( --> s )
[ ' [ f.action f.end
f.incr f.index ] ] is f.stacks ( --> [ )
[ f.index share ] is index ( --> n )
[ f.incr replace ] is incr ( n --> )
[ f.end replace ] is end ( b --> )
[ 1 false ]'[
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1 incr
f.end share until ]
▲ witheach release ] is from ( n --> )
<code>from</code> takes its initial index from the stack, and performs the nest that follows it repeatedly until the ending condition is satisfied, incrementing the index at the end of each iteration.
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dip [ char , join ]
again ]
join reverse echo$ ]
0
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