Syntax error Control flow alterations in Ruby

Control flow alterations in Ruby

In addition to loops, conditionals, and iterators, Ruby has some statements that are used to change the control flow in a program. In other words, these statements are pieces of code that execute one after the other until a condition is met.

In this article, we will explore the following control flow alterations in Ruby −

  • break statement

  • next statement

  • redo statement

  • retry statement

Let's consider each of these one by one.

break statement

When a condition is True in Ruby, the break statement terminates a loop.

Example

Consider the code shown below.

# break statement example
itr = 1

while true
   if itr * 6 >= 35
      break
   end
   puts itr * 6
   itr += 1
end

Output

It will produce the following output −

6
12
18
24
30

next statement

The next statement is used to jump to the next iteration of a loop in Ruby.

Example 

Consider the code shown below.

# next statement example
for tr in 0...10
   if tr == 6 then
      next
   end
   puts tr
end

Output

When we execute this code, it will produce the following output −

0
1
2
3
4
5
7
8
9

redo statement

Using the redo statement, you can restart an iterator or loop.

Example

Consider the code shown below.

# redo statement example

v = 0

while(v < 4)
   puts v
   v += 1

   # redo statement
   redo if v == 3
end

Output

It will produce the following output −

0
1
2
3

retry statement

retry statement is used to restart an iterator based on a condition or any method call from the start.

Example

Consider the code shown below.

# retry statement example
10.times do |itr|
   begin
      puts "Iteration #{itr}"
      raise if itr > 7
   rescue
      retry
   end
end

Output

When we execute this code, it will produce the following output −

Iteration 8
Iteration 8
Iteration 8
Iteration 8
Iteration 8
.
.
.
Updated on: 2022-04-12T07:43:48+05:30

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