How to create loops in Ruby

A loop is the repetitive execution of a piece of code for a given amount of repetitions or ​until a certain condition is met. For instance, if a string is to be printed five times it can be done by typing five print statements; but, it is easier to set-up a loop to execute the same block of code five times.

Different types of loops (Ruby)

While Statement

The while statement executes a code repeatedly ​as long as the condition is true.

A while loop’s conditional is separated from the code by the reserved word do, a newline, a backslash (\), or a semicolon.

Syntax

Code

See the example below of how to write a while loop in Ruby:

While modifier

begin and end can also be used to create a while loop.

Syntax

Code

See the example below of how to write a begin/end while loop in Ruby:

Until statement

The until loop executes while the condition is false.

An until loop’s conditional is separated from the code by the reserved word do, a newline, backslash (\), or a semicolon.

Syntax

Code

See the example below of how to write an until loop in Ruby:

Until modifier

Like the while modifier, begin and end can also be used ​to create an until loop.

Syntax

Code

See the example below of how to write a begin/end until loop in Ruby:

For statement

The for loop consists of for, followed by a variable to contain the iteration argument, followed by in, and the value to iterate over using each.

Syntax

Code

See the example below of how to write a for loop in Ruby: