Loops in Ruby are used to run a given block of code for a given amount of repetition or until a certain condition is met, when the same statement or task needs to be run more than once, for example, If you want to print the number from 1 to 10 instead of printing each number, we can use a loop to automate the task. The use of loops also reduces the number of lines used in the program, so it reduces the length of the code and automates certain tasks. 

Ruby has four types of loops which are as follows: 

Now we will discuss in detail one by one. 

For loop is an entry-controlled loop that is used to repeatedly perform certain activities based on conditions. First, check the condition for the loop, if it is true it will repeat the loop which is why it is called an entry controlled loop. The number of repetitions for the loop is determined based on the condition, so it is suitable for programs where the number of repetitions performed is fixed.

for variable in expression do
statement to be executed
end 
  

In the syntax mentioned above, a keyword used for a loop, a variable is the name of a variable (the name of the variable may be something other than the saved keyword). It is a keyword that checks the condition after the expression, the expression is the condition used to evaluate the code or program. do is a keyword that moves the flow control inside the loop if the condition is true otherwise it will eventually transfer the flow control and shut down the program Inside the for loop, the statement that needs to be executed is announced. the end is the keyword used to finish the code.

 Example to Implement for loop in ruby:  

 puts("Enter the maximum number: ")
num = gets.chomp.to_i
puts("The series: ")
for i in 1..num do
puts(i)
end  

Here we have written a program to print series according to the wishes of the users. The program first prompts a message showing the maximum number entered. Variable numbers are used to store values ​​entered by the user. Gets. chomp will allow a user to enter their values. 1..num condition is used to print the series from the maximum value 1 specified by the user. The loop will repeat and print the result until the condition is false. 

Like for loop, when the condition is used to repeat the loop program repeatedly until a false result is given. When the loop first tests the condition, if the condition is true it will transfer the flow control inside the loop and repeat the same procedure until the condition is false. When the loop is suitable for the program where the number of repetitions performed is not fixed. 

 while condition
statement to be executed
end 

In the syntax mentioned above, when it is the keyword used for a while loop, the condition is used to evaluate a program defined by the user. If the condition is true, it will execute the statement defined in the loop, otherwise, it will close the program and transfer the flow control outside the loop. The end is the keyword that is used to close the program. 

 x = 1
puts("Enter the maximum number: ")
num = gets.chomp.to_i
puts("The series: ")
while x <= num
puts(x)
x += 1
end  

Here we have written a program to print a series of numbers in the same way that we have performed for a loop, similarly when written for a loop. The only difference here is when we have syntax and different terms. Here we have written a program where the variable x is started and the value of the variable number will be defined by the user. It will print the value until the value of x is less than or equal to num, and the value of x will increase by 1. 

The do-while loop is a lot like a while loop, the only difference being that the do-while loop is executed at least once because the conditions used to evaluate the program are written at the end of the loop, so the loop is executed at least one time. 

 loop do
Statement to be executed
break if condition
end  

In the syntax mentioned above, do is a keyword used for a do-while loop, the do loop will transfer flow control inside the loop and the statement will be executed.
break if tare keyword which will break the loop if the condition is true and transfer the flow control to the last statement which will close the program.
Program to implement doo while looping in ruby 

 loop do
puts "Checking for answer"
x = gets.chomp
if x != '10'
break
end
end  

Until the loop is used to run the loop repeatedly. The loop will repeat the loop until the condition is true. 

 until condition
statement to be executed
end  

The keyword for till loop is used in the syntax mentioned above until the keyword checks the condition and executes the loop until the condition is true. If the condition is true, it will close the code.

 Example to Implement until loop in ruby:  

 x = 1
puts("Enter the maximum number: ")
num = gets.chomp.to_i
puts("The series: ")
until x == num
puts(x)
x += 1
end  

The same program is written which is written using the ill keyword for all the above programs. The concept and logic are the same as the other examples.

From this tutorial we have learned the principles of Ruby Loop usage and working principles, we have learned about the flow for Ruby Loops and some practical applications, we have learned how to manage data arrays and numbers from beginning to end. We also saw the flow chart for the loop for "for loop" in Ruby.

Introduction to For loop in Ruby. For Loop in Ruby allow developers to reuse the same piece of code for the various time, or in more clear way loop in ruby ...

loop in ruby

Trending Blogposts on loop in ruby

Amazing 4 Types of Loop in Ruby

Popular Discussions on loop in ruby

PRODUCTS

QUICK LINKS

LEGAL

loop in ruby

Trending Blogposts on loop in ruby

Amazing 4 Types of Loop in Ruby

Popular Discussions on loop in ruby