Ruby Each Do With Index

We will be discussing two iterators here each and collect.

Ruby each do with index. If no block is given an enumerator is returned instead. The ruby each loop. For a hash you create two elements one for the hash key and one for the value. This works exactly like the each method for an array object with one crucial difference.

A negative index is assumed relative to the end of the array that is an index of 1 indicates the last element of the array 2 is the next to last element in the array and so on. When you think about ruby you think oop. Before you can use each you need a collection of items like an array a range or a hash. But in this article we re going to look at the each method how to use it and what you can do with it.

It s the ruby way of doing repeat until done. Given arguments are passed through to each. When it comes to doing the same thing over and over again ruby has a few methods you can choose from. Ruby arrays can hold objects such as string integer fixnum hash symbol even other array objects.

Syntax collection each do variable code end. The ruby method each allows you to go over a list of items without having to keep track of the number of iterations or having to increase some kind of counter. Let s look at these in detail. Calls block with two arguments the item and its index for each item in enum.

Like the array these elements are placeholders that are used to pass each key value pair into the code block as ruby loops through the hash. Iterators return all the elements of a collection one after the other. The each iterator returns all the elements of an array or a hash.