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added map_call for mapping a sequence with a method call (useful for object-y collections)
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@ -99,6 +99,23 @@ function functional.map_field(t, k)
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return result
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end
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--maps a sequence
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-- if f is a string method name like "position", {a, b} -> {a:f(...), b:f(...)}
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-- if f is function reference like player.get_position, {a, b} -> {f(a, ...), f(b, ...)}
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-- (automatically drops any nils to keep a sequence)
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function functional.map_call(t, f, ...)
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local result = {}
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for i = 1, #t do
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local v = t[i]
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local f = type(f) == "function" and f or v[f]
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v = f(v, ...)
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if v ~= nil then
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table.insert(result, v)
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end
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end
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return result
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end
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--maps a sequence into a new index space (see functional.map)
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-- the function may return an index where the value will be stored in the result
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-- if no index (or a nil index) is provided, it will insert as normal
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@ -68,6 +68,7 @@ end
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for _, v in ipairs({
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"map",
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"map_field",
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"map_call",
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"filter",
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"remove_if",
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"zip",
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