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[added] "canonical" identity function

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Max Cahill 2020-06-02 15:17:50 +10:00
parent eba27da544
commit a85eec80e2
1 changed files with 6 additions and 1 deletions
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7
functional.lua
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@ -18,6 +18,11 @@ local functional = setmetatable({}, {
__index = tablex, __index = tablex,
}) })
--the identity function
function functional.identity(v)
return v
end
--simple sequential iteration, f is called for all elements of t --simple sequential iteration, f is called for all elements of t
--f can return non-nil to break the loop (and return the value) --f can return non-nil to break the loop (and return the value)
function functional.foreach(t, f) function functional.foreach(t, f)
@ -161,7 +166,7 @@ end
--2d version of the above --2d version of the above
--note: ends up with a 1d table; --note: ends up with a 1d table;
-- if you need a 2d table, nest 1d generate calls -- if you need a 2d table, you should nest 1d generate calls
function functional.generate_2d(width, height, f) function functional.generate_2d(width, height, f)
local r = {} local r = {}
for y = 1, height do for y = 1, height do