PhantomCaleb (talk | contribs) No edit summary |
PhantomCaleb (talk | contribs) mNo edit summary |
||
Line 20: | Line 20: | ||
end |
end |
||
− | -- @args {fn1, fn2, ..., fnN} |
||
− | -- @returns A single function whose arguments are passed to fn1. Output of fn1 is passed to fn2, and so on. |
||
− | -- Similar to https://lodash.com/docs/#flow |
||
function p.pipe(...) |
function p.pipe(...) |
||
− | local |
+ | local state = {...} |
− | return function( |
+ | return function(functions) |
− | local state = {...} |
||
for _, fn in ipairs(functions) do |
for _, fn in ipairs(functions) do |
||
state = {fn(unpack(state))} |
state = {fn(unpack(state))} |
Revision as of 17:19, 25 April 2020
The functions in this module return other functions, namely iterators. It also contains utility functions for functional programming. Lua error in Module:Documentation/Module at line 618: attempt to call field 'memoize' (a nil value).
local p = {}
function p.identity(...)
return ...
end
function p.negate(fn)
return function(...)
return not fn(...)
end
end
function p.noop()
return nil
end
function p.peek(tbl)
mw.logObject(tbl)
return tbl
end
function p.pipe(...)
local state = {...}
return function(functions)
for _, fn in ipairs(functions) do
state = {fn(unpack(state))}
end
return unpack(state)
end
end
-- http://lua-users.org/wiki/RangeIterator
function p.range(a, b, step)
if not b then
b = a
a = 1
end
step = step or 1
local f =
step > 0 and
function(_, lastvalue)
local nextvalue = lastvalue + step
if nextvalue <= b then return nextvalue end
end or
step < 0 and
function(_, lastvalue)
local nextvalue = lastvalue + step
if nextvalue >= b then return nextvalue end
end or
function(_, lastvalue) return lastvalue end
return f, nil, a - step
end
return p