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What is a shorter version of this?:
from = hash.fetch(:from) to = hash.fetch(:to) name = hash.fetch(:name) # etc Note the fetch, I want to raise an error if the key doesn't exist.
There must be shorter version of it, like:
from, to, name = hash.fetch(:from, :to, :name) # <-- imaginary won't work It is OK to use ActiveSupport if required.
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Each key can only have one value. But the same value can occur more than once inside a Hash, while each key can occur only once.
Multiple Values For One Key Words are unique, but they can have multiple values (definitions) associated with them. You can do this in Ruby!
Hash#fetch() is a Hash class method which returns a value from the hash for the given key. With no other arguments, it will raise a KeyError exception. Syntax: Hash.fetch() Parameter: Hash values. Return: value from the hash for the given key.
Use Hash's values_at method:
from, to, name = hash.values_at(:from, :to, :name) This will return nil for any keys that don't exist in the hash.
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