Ruby Loops And Iterators

Syntax collection each do variable code end.

Ruby loops and iterators.

The each iterator returns all the elements of an array or a hash. Loops and iterators loops are structures in ruby which allow you to easily repeat a section of code a number of times. The simplest way to create a loop in ruby is using the loop method loop takes a block which is denoted by. 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.

This chapter details all the loop statements supported by ruby. Ruby loops loops in ruby are used to execute the same block of code a specified number of times. You can use the for loop to loop over values in a range e g. An iterator is a looping construct in ruby.

We optionally use an iteration variable enclosed in vertical bars. We will cover while loops do while loops and for loops. Some operations in computer programming are best served with a loop. Times step loops test and benchmark iterators.

Let s look at these in detail. Iterators return all the elements of a collection one after the other. Arguments to the iterator is re evaluated. Use times upto downto step and each in programs.

It uses method syntax. In ruby arrays and hashes can be termed collections. If we discount the loop method then the for loop acts as a kind of bridge between looping constructs and iterators in ruby. If retry appears in the iterator the block or the body of the for expression restarts the invocation of the iterator call.