Ruby Loops And Iterators

The simplest way to create a loop in ruby is using the loop method loop takes a block which is denoted by.

Ruby loops and iterators.

We optionally use an iteration variable enclosed in vertical bars. In ruby arrays and hashes can be termed collections. We will be discussing two iterators here each and collect. Ruby loops loops in ruby are used to execute the same block of code a specified number of times.

We will cover while loops do while loops and for loops. This chapter details all the loop statements supported by ruby. If retry appears in the iterator the block or the body of the for expression restarts the invocation of the iterator call. Arguments to the iterator is re evaluated.

Use times upto downto step and each in programs. It uses method syntax. Times step loops test and benchmark iterators. If we discount the loop method then the for loop acts as a kind of bridge between looping constructs and iterators in ruby.

An iterator is a looping construct in ruby. 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. Syntax collection each do variable code end.

Loops and iterators loops are structures in ruby which allow you to easily repeat a section of code a number of times. The for loop is still a looping construct but it acts almost like an iterator without actually taking a block. Let s look at these in detail. 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.