Hash#to_proc
In Ruby, we can convert hashes to procs.
> {}.respond_to?(:to_proc)
=> true
> {}.to_proc
=> #<Proc:0x000000010741f7a0 (lambda)>
We could do something like this.
my_hash = {
1 => "thumb",
2 => "shoe",
3 => "knee"
}
> [*1..3].map(&my_hash)
=> ["thumb", "shoe", "knee"]
The hash is called with each element of the array.
If an element in the array does not correspond with a key in the hash, it maps to nil.
> [*1..4].map(&my_hash)
=> ["thumb", "shoe", "knee", nil]