Ruby Loops And Iterators

It uses method syntax.

Ruby loops and iterators.

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. Syntax collection each do variable code end. In ruby arrays and hashes can be termed collections.

Some operations in computer programming are best served with a loop. Times step loops test and benchmark iterators. We will be discussing two iterators here each and collect. We optionally use an iteration variable enclosed in vertical bars.

Arguments to the iterator is re evaluated. A loop is the repetitive execution of a piece of code for a given amount of repetitions or until a certain condition is met. If we discount the loop method then the for loop acts as a kind of bridge between looping constructs and iterators in ruby. Let s look at these in detail.

Use times upto downto step and each in programs. The simplest way to create a loop in ruby is using the loop method loop takes a block which is denoted by. The each iterator returns all the elements of an array or a hash. You can use the for loop to loop over values in a range e g.

We will cover while loops do while loops and for loops. If retry appears in the iterator the block or the body of the for expression restarts the invocation of the iterator call. Ruby loops loops in ruby are used to execute the same block of code a specified number of times. Iterators return all the elements of a collection one after the other.