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util.iterators: Add head() iterator, to return the first n items

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Matthew Wild 2009-08-10 15:07:32 +01:00
parent 20984a8ffb
commit bcb552cdc4
1 changed files with 12 additions and 0 deletions
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12
util/iterators.lua
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@ -78,6 +78,18 @@ function count(f, s, var)
return x; return x;
end end
-- Return the first n items an iterator returns
function head(n, f, s, var)
local c = 0;
return function (s, var)
if c >= n then
return nil;
end
c = c + 1;
return f(s, var);
end, s;
end
-- Convert the values returned by an iterator to an array -- Convert the values returned by an iterator to an array
function it2array(f, s, var) function it2array(f, s, var)
local t, var = {}; local t, var = {};