Control Flow

Do-While Loop in Ruby

The while loop executes a block of code while a boolean expression evaluates to true. It checks the boolean expression after each iteration. It terminates as soon as the expression evaluates to false.

Syntax

loop do 
  #code to be executed
  break if booleanExpression
end 

Notes

Because the do-while loop evaluates the boolean expression at the end of the iteration, the block of code within the loop is guaranteed to run at least once.

booleanExpression results in either a true or false output. It is created using comparing operators (==, >, =, <=, !=).

There can also be multiple boolean expressions within the parentheses (booleanExpression). The boolean expressions are connected through logical operators (&&, ||, !).

Example

x = 0
loop do
    x++
    break if x > 100
end