Ruby Loops And Iterators

We will be discussing two iterators here each and collect.

Ruby loops and iterators.

The for loop is still a looping construct but it acts almost like an iterator without actually taking a block. Some operations in computer programming are best served with a loop. Iterators return all the elements of a collection one after the other. It uses method syntax.

Syntax collection each do variable code end. The simplest way to create a loop in ruby is using the loop method loop takes a block which is denoted by. Use times upto downto step and each in programs. 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. 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 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.

You can use the for loop to loop over values in a range e g. The each iterator returns all the elements of an array or a hash. We will cover while loops do while loops and for loops. Loops and iterators loops are structures in ruby which allow you to easily repeat a section of code a number of times.

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. Times step loops test and benchmark iterators. Arguments to the iterator is re evaluated.