OrderedDicts and OrderedSets
OrderedDicts
are simply dictionaries whose entries have a particular order. For OrderedDicts
(and OrderedSets
), order refers to insertion order, which allows deterministic iteration over the dictionary or set:
d = OrderedDict{Char,Int}()
for c in 'a':'e'
d[c] = c-'a'+1
end
collect(d) # => [('a',1),('b',2),('c',3),('d',4),('e',5)]
s = OrderedSet(π,e,γ,catalan,φ)
collect(s) # => [π = 3.1415926535897...,
# e = 2.7182818284590...,
# γ = 0.5772156649015...,
# catalan = 0.9159655941772...,
# φ = 1.6180339887498...]
All standard Dict
functions are available for OrderedDicts
, and all Set
operations are available for OrderedSets
.
Note that to create an OrderedSet
of a particular type, you must specify the type in curly-braces:
# create an OrderedSet of Strings
strs = OrderedSet{AbstractString}()