hash code snippets in ruby

a shorter way to do: ` arr = %w[black brown red orange yellow green blue violet grey white] cols = arr.each_with_index.map {|col , ind| [col, ind.to_s]}.to_h` in ruby

add a key-value pair to a map in ruby

append to a json file in ruby

can you patiently explain what happens in this? `words_array.each do |word| word_counts[word] ||= 0 word_counts[word] += 1 end` in ruby

combine two maps in ruby

create a blake2b hash from a string in ruby

create a md5 hash from a string in ruby

create a sha256 hash from a string in ruby

create a sha512 hash from a string in ruby

create an dictionary with every book of the bible in it where the key is all lowercase and the value is capitalized in ruby

find the average of all keys in a map in ruby

find the average of all values in a map in ruby

find the difference of two maps in ruby

find the intersection of two maps in ruby

find the key associated with a value in a map in ruby

find the keys of a map in ruby

find the kth least frequent element in an array in ruby

find the kth most frequent element in an array in ruby

find the largest key in a map in ruby

find the median of all values in a map in ruby

find the mode of all elements in an array in ruby

find the mode of all keys in a map in ruby

find the mode of all nodes in a linked list in ruby

find the mode of all values in a map in ruby

find the range of all values in a map in ruby

find the smallest key in a map in ruby

find the smallest value in a map in ruby

find the sum of all keys in a map in ruby

find the symmetric difference of two maps in ruby

find the union of two maps in ruby

find the value associated with a key in a map in ruby

find the values of a map in ruby

find the variance of all keys in a map in ruby

find the variance of all values in a map in ruby

generate a hash from this: `%w[black brown red` such that values are its index. in ruby

how to change `cols = %w(black, brown, red)` to this: `cols = { "black" => '0', "brown" => '1', "red" => '2'}` in ruby

how to return the total value of all the hash values of three hashes, each of which is an element of an array using map or some shorter code? in ruby

how to sum [{ a: 5, b: 10, c: 15 }, {}, {q: 67}] such the i don't get the "undefined method `values' for nil:nilclass" error in ruby

how to sum this if the hash is inside an array? [{ a: 5, b: 10, c: 15 }] in ruby

how to sum values found in a hash? in ruby

i have an array with 3 elements, each is a hash. how to print the third hash? in ruby

remove a key-value pair from a map in ruby

select from an array whose elements are hashes in ruby

shorter way to do: ` cols = {black:0, brown:1, red:2} def value(arr) = (cols[arr[0].to_sym].to_s + cols[arr[1].to_sym].to_s).to_i end` ? in ruby

split a map into two maps in ruby

what to do in order to get ["0", "[0, 1], "{foo: 0}"] in ruby