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Higher-order functions: Difference between revisions
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=={{header|Lingo}}==
Lingo doesn't support first-class functions. But global functions - i.e. either built-in functions or user-defined functions in movie scripts - can be specified and used by passing a "symbol". So for such global functions, the task can be solved. Here as example an implementation of a "map" function:
<lang lingo>-- in some movie script
----------------------------------------
-- Runs provided function on all elements of the provided list, returns results as new list
-- @param {list} tList
-- @param {symbol} cbFunc
-- @param {object} [cbObj=_movie]
-- @return {list}
----------------------------------------
on map (tList, cbFunc, cbObj)
if voidP(cbObj) then cbObj = _movie
res = []
cnt = tList.count
repeat with i = 1 to cnt
res[i] = call(cbFunc, cbObj, tList[i])
end repeat
return res
end</lang>
<lang lingo>l = [1, 2, 3]
-- passing the built-in function 'sin' (which is a method of the _movie object) as argument to map
res = map(l, #sin)
put res
-- [0.8415, 0.9093, 0.1411]
</lang>
=={{header|Logo}}==
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