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Code Issues Releases Activity

Make limit/2 more efficient

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Contributed by @pkoppstein.
This commit is contained in:
Nicolas Williams
2018-03-06 13:55:16 -06:00
parent e113c67d51
commit 7fd9e86ea6
1 changed files with 3 additions and 7 deletions
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10
src/builtin.jq
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@ -168,13 +168,9 @@ def until(cond; next):
if cond then . else (next|_until) end;
_until;
def limit($n; exp):
if $n < 0 then exp else
label $out |
foreach exp as $item (
[$n, null];
if .[0] < 1 then break $out
else [.[0] -1, $item] end;
if .[0] == 0 then .[1], break $out else .[1] end) end;
if $n < 0 then exp
else label $out | foreach exp as $item ($n; .-1; $item, if . <= 0 then break $out else empty end)
end;
def isempty(g): 0 == ((label $go | g | (1, break $go)) // 0);
def first(g): label $out | g | ., break $out;
def last(g): reduce g as $item (null; $item);