How to Use next in Ruby: Skip to Next Loop Iteration

In Ruby, next is used inside loops to skip the rest of the current iteration and immediately start the next one. It helps control loop flow by ignoring certain steps when a condition is met.

Syntax

The next keyword is used inside loops like for, while, or each. When Ruby encounters next, it skips the remaining code in the current loop cycle and moves to the next iteration.

Basic syntax:

loop do
  # some code
  next if condition
  # code skipped if condition is true
end

ruby

for i in 1..5
  next if i == 3
  puts i
end

Output

1
2
4
5

Example

This example shows how next skips printing the number 3 in a loop from 1 to 5.

ruby

1.upto(5) do |i|
  if i == 3
    next
  end
  puts "Number: #{i}"
end

Output

Number: 1
Number: 2
Number: 4
Number: 5

Common Pitfalls

One common mistake is using next outside of loops, which causes an error because next only works inside loops. Another is forgetting that next skips the rest of the current iteration, so any code after next in the loop will not run when next is triggered.

ruby

i = 0
# Wrong: next outside loop
# next  # This will cause a LocalJumpError

# Correct usage inside loop
while i < 5
  i += 1
  next if i == 3
  puts i
end

Output

1
2
4
5

Quick Reference

• Use inside loops: for, while, each, etc.
• Purpose: Skip current iteration and continue with next.
• Common use: Skip unwanted values or conditions.
• Note: Code after next in the loop is not executed for that iteration.

Key Takeaways

Use next inside loops to skip the rest of the current iteration.

next immediately moves to the next loop cycle when triggered.

Do not use next outside of loops; it causes errors.

Code after next in the loop is ignored for that iteration.

Commonly used to skip unwanted values or conditions in loops.