Ruby Loops And Iterators

A loop is the repetitive execution of a piece of code for a given amount of repetitions or until a certain condition is met.

Ruby loops and iterators.

The each iterator returns all the elements of an array or a hash. This functionality can always be accomplished through simply writing repetitive lines of code however compacting everything into one loop makes changing a small feature about each repeated line very easy and it abides to the core don t repeat yourself principle of. In ruby arrays and hashes can be termed collections. Iterators return all the elements of a collection one after the other.

An iterator is a looping construct in ruby. If we discount the loop method then the for loop acts as a kind of bridge between looping constructs and iterators in ruby. Some operations in computer programming are best served with a loop. Loops and iterators loops are structures in ruby which allow you to easily repeat a section of code a number of times.

We will cover while loops do while loops and for loops. Ruby loops loops in ruby are used to execute the same block of code a specified number of times. This chapter details all the loop statements supported by ruby. Use times upto downto step and each in programs.

Let s look at these in detail. It uses method syntax. The for loop is still a looping construct but it acts almost like an iterator without actually taking a block. The simplest way to create a loop in ruby is using the loop method loop takes a block which is denoted by.

Times step loops test and benchmark iterators. Syntax collection each do variable code end. Arguments to the iterator is re evaluated. If retry appears in the iterator the block or the body of the for expression restarts the invocation of the iterator call.