How to merge hashes in Ruby
Overview
We can merge two hashes using the merge() method.
When using the merge() method:
- Each new entry is added to the end.
- Each duplicate-key entry’s value overwrites the previous value.
Syntax
hash.merge(other_hash)
Parameter(s)
other_hash: This is the hash we want to merge with the hash. They could be one or more.
Return value
This method returns a new hash object formed by merging other_hash into hash hash.
Example
# create some hashesh1 = {one: 1, two: 2, three: 3}h2 = {two:22, three: 33}h3 = {"foo": 0, "bar": 1}h4 = {"foo": 1}h4 = {M:"Mango", A: "Apple", B: "Banana"}h5 = {C: "Cabbage", P: "Pineapple"}# merge hashesputs h1.merge(h2)puts h3.merge(h4)puts h4.merge(h5)
Explanation
- Lines 2 to 7: We create some hashes.
- Lines 10 to 12: We merge some hashes and their results are printed to the console.