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<h2>Full example</h2>
<pre><code>class List
new: (t) =>
if t then return t
append: table.insert
join: table.concat
map: (f,...) => List [f x,... for x in *self]
-- apply a function on a list in-place
apply: (f,...) =>
for i = 1,#@ do @[i] = f @[i],...
self
clone: => @slice 1
slice: (i1,i2=#@) =>
-- workaround for MS slice bug
if i2 < 0 then i2 = #@ + i2 + 1
List [x for x in *self[i1,i2]]
extend: (other) =>
i = #self + 1
for o in *other
self[i] = o
i += 1
self
partition: (pred,...) =>
res = {}
for x in *@
k = pred x,...
if not res[k] then res[k] = List!
res[k]\append x
res
lpartition: (n,npred,...) =>
res = List[List{} for i = 1,n]
for x in *@
k = npred x,...
if k >= 1 and k <= n
res[k]\append x
res
__concat: (l1,l2) ->
List.clone(l1)\extend l2
__tostring: =>
tmp = @slice(1,10)\apply tostring
if #@ > 10 then tmp\append '...'
"["..tmp\join(',').."]"
-- hack to modify class so its constructor may return a new self
patch = (klass) -> getmetatable(klass).__call = (cls,...) ->
self = setmetatable {}, cls.__base
newself = cls.__init self, ...
if newself
self = setmetatable newself, cls.__base
self
patch List
return List</code></pre>
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