Ruby Each Do With Index

Syntax collection each do variable code end.

Ruby each do with index.

If no block is given an enumerator is returned instead. When you think about ruby you think oop. Ruby arrays are not as rigid as arrays in other languages. When it comes to doing the same thing over and over again ruby has a few methods you can choose from.

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. 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. Iterators return all the elements of a collection one after the other.

This works exactly like the each method for an array object with one crucial difference. The each iterator returns all the elements of an array 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. Given arguments are passed through to each.

Calls block with two arguments the item and its index for each item in enum. For a hash you create two elements one for the hash key and one for the value. It s the ruby way of doing repeat until done. In ruby arrays and hashes can be termed collections.

Before you can use each you need a collection of items like an array a range or a hash. The ruby each loop. 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.