Ruby Loops And Iterators

We will be discussing two iterators here each and collect.

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. The for loop is still a looping construct but it acts almost like an iterator without actually taking a block. If we discount the loop method then the for loop acts as a kind of bridge between looping constructs and iterators in ruby. It uses method syntax.

An iterator is a looping construct in ruby. Arguments to the iterator is re evaluated. Times step loops test and benchmark iterators. 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. Use times upto downto step and each in programs. We optionally use an iteration variable enclosed in vertical bars. Some operations in computer programming are best served with a loop.

In ruby arrays and hashes can be termed collections. Loops and iterators loops are structures in ruby which allow you to easily repeat a section of code a number of times. This chapter details all the loop statements supported by ruby. We will cover while loops do while loops and for loops.

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. 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.