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I have the following hash:
a = {
foo: 'bar',
answer: '42'
}
How can I elegantly rename the key :foo to a new key :test? If the hash entry for :foo does not exist, the hash should not be altered.
901
We can check if a particular hash contains a particular key by using the method has_key?(key) . It returns true or false depending on whether the key exists in the hash or not.
To change a HashMap key, you look up the value object with get, then remove the old key and put it with the new key. To change the fields in a value object, look the value object up by key with get, then use its setter methods. To replace the value object in its entirely, just put a new value object at the old key.
The contents of a certain hash can be replaced in Ruby by using the replace() method. It replaces the entire contents of a hash with the contents of another hash.
a[:test] = a.delete(:foo) if a.key?(:foo)
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