Ruby Map Hash

Ruby Map Hash. Ruby with Hash PPT If neither an argument nor a block is given, initializes both the default value and the default proc to nil: This week I want to talk about HASHES! Before I dive head first into my favorite methods, I want to give a quick summary of what a hash is in Ruby and how it works

I think it's so cool that the Ruby map method exists Its primary function is to facilitate the conversion or modification of data elements in a collection, streamlining the process of data manipulation

Ruby with Hash PPT

Although you'll always have to_a and it's faster, this trick is too cool to ignore… The definition of a Hash straight from the docs themselves: A Hash is a dictionary-like collection(If you are a Java person, think maps) of unique keys and their values. That means that Ruby programmers don't have to write all those methods many different times - they just write them once, package them up as Enumerable, and tell Array and Hash to include them

Ruby — Convert Array to Hash. with Splat operator by Jasiek Matusz marahin. When the block is omitted, collect or map uses this implied block: {|item| item}, which means when applied on an hash without a block, collect/map returns an array containing a set of two-item arrays, one for each key/value pair in the hash. Although you'll always have to_a and it's faster, this trick is too cool to ignore…

Algorithms and Data Structures Series Hash Maps Geison Biazus. range = (1..5) doubled_values = range.map { |num| num * 2 } puts doubled_values # Output: [2, 4, 6, 8, 10] Chaining Ruby Map with Other Methods A hash with three key/value pairs looks like this: { a: 1, b: 2, c: 3 } Where a is a key, and 1 is the corresponding value for that key