Ruby Loops And Iterators

Some operations in computer programming are best served with a loop.

Ruby loops and iterators.

The for loop is still a looping construct but it acts almost like an iterator without actually taking a block. An iterator is a looping construct in ruby. It uses method syntax. You can use the for loop to loop over values in a range e g.

Use times upto downto step and each in programs. In ruby arrays and hashes can be termed collections. Iterators return all the elements of a collection one after the other. Syntax collection each do variable code end.

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 each iterator returns all the elements of an array or a hash. The simplest way to create a loop in ruby is using the loop method loop takes a block which is denoted by. We will cover while loops do while loops and for loops.

Arguments to the iterator is re evaluated. Times step loops test and benchmark iterators. If retry appears in the iterator the block or the body of the for expression restarts the invocation of the iterator call. 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.

Ruby loops loops in ruby are used to execute the same block of code a specified number of times. Let s look at these in detail. 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.