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[modified] functional.lua find_best changed to ipairs and added find_min and find_max better named alternatives

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Max Cahill 2020-04-04 18:59:40 +10:00 committed by GitHub
parent 9422152181
commit 4bbbdf86d6
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1 changed files with 22 additions and 4 deletions
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26
functional.lua
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@ -241,13 +241,28 @@ function _table.min(t)
return min
end
--return the element of the table that results in the lowest numeric value
--(function receives element and index respectively)
function _table.find_min(t, f)
local current = nil
local current_best = math.huge
for i, v in ipairs(t) do
v = f(v, i)
if v and v < current_best then
current_best = v
current = e
end
end
return current
end
--return the element of the table that results in the greatest numeric value
--(function receives element and key respectively, table evaluated in pairs order)
function _table.find_best(t, f)
--(function receives element and index respectively)
function _table.find_max(t, f)
local current = nil
local current_best = -math.huge
for k,e in pairs(t) do
local v = f(e, k)
for i, v in ipairs(t) do
v = f(v, i)
if v and v > current_best then
current_best = v
current = e
@ -256,6 +271,9 @@ function _table.find_best(t, f)
return current
end
--alias
_table.find_best = _table.find_max
--return the element of the table that results in the value nearest to the passed value
--todo: optimise as this generates a closure each time
function _table.find_nearest(t, f, v)