### Iterating over an OrderedDict in Julia

Source: https://github.com/juliacollections/orderedcollections.jl/blob/master/docs/src/index.md

Illustrates creating an OrderedDict with character keys and integer values, populating it, and then iterating over its entries. The iteration order follows the insertion order.

```Julia
d = OrderedDict{Char,Int}()
for c in 'a':'d'
    d[c] = c-'a'+1
end
for x in d
   println(x)
end
```

--------------------------------

### Iterating over an OrderedSet in Julia

Source: https://github.com/juliacollections/orderedcollections.jl/blob/master/docs/src/index.md

Demonstrates creating an OrderedSet with mathematical constants and iterating over its elements, showing that the iteration order matches the insertion order. Requires the `Base.MathConstants` module.

```Julia
using Base.MathConstants
s = OrderedSet((π,e,γ,catalan,φ))
for x in s
   println(x)
end
```

--------------------------------

### Iterating over a LittleDict in Julia

Source: https://github.com/juliacollections/orderedcollections.jl/blob/master/docs/src/index.md

Demonstrates creating and iterating over a LittleDict, which is similar to OrderedDict but optimized for small collections. The iteration order is preserved.

```Julia
d = LittleDict{Char,Int}()
for c in 'a':'d'
    d[c] = c-'a'+1
end
for x in d
   println(x)
end
```

--------------------------------

### Creating a Type-Specific OrderedSet in Julia

Source: https://github.com/juliacollections/orderedcollections.jl/blob/master/docs/src/index.md

Shows how to create an empty OrderedSet that is explicitly typed to hold elements of a specific type, in this case, `AbstractString`.

```Julia
strs = OrderedSet{AbstractString}()
```

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