Hashes

Rumiko Acopa

2 min readJun 28, 2021

My weekly coding…

This week was busy but I was able to get in some coding. My focus was on hashes.

Figure out how to practice your coding in ruby playground.rb
Figure out how to use Repl.it to practice your coding skills as well.
Practice, Practice and Practice some more!

“Hashing Around”

Start by creating a hash.

{}hash_name = {'name' => 'Logan', 'favorite color' => 'Yellow'}

To access the value of the hash and figure out what is the name.

hash_name["name"]

Creating a |key, value| pair

new_hash = {a: 1, b: 2, c: 3, d: 4, e: 5, f: 6}

However, doing this will create symbols a, b, c , d, e, and f (not strings) as keys

To get the value for key e above you can do this:

new_hash[:e]

In order to add a |key, value| pair to the hash above:

new_hash[:b] = 9new_hash[:name] = "Professor X "

If you would like to delete a |key, value| pair simply delete the key:

new_hash.delete(:b)

You may want to list the keys in a hash, followed by values of the hash:

new_hash.keys
new_hash.values

Photo by Ricardo Gomez Angel on Unsplash

Iterating Through A Hash

Iterate through a hash

use .each method
print out the value

new_hash.each { |somekey, somevalue| puts somevalue }

Iterate through a hash

use .each method
print out both key and value

new_hash.each { |somekey, somevalue| puts "The key is #{somekey} and the value is #{somevalue}" }

Iterate and delete an item & a condition (in the condition below if the value is less than 3:

new_hash.each { |k, v| new_hash.delete(k) if v < 3 }

Learn how to find the methods

rubyonrails.org is a great way to look up methods to use. One method is the select method. This example method displays items only if value of the item is even

new_hash.select { |k, v| v.even? }

Happy Coding!

#YourCodingEsty