Loops in Ruby

times, upto, while and each — and why bare for loops are rare.

3.times { |i| puts "pass #{i}" }

1.upto(3) { |n| puts "count #{n}" }

total = 0
while total < 10
  total += 4
end
puts total

[5, 12, 8, 20].each do |n|
  next if n < 10
  puts "big: #{n}"
end

How it works

3.times and 1.upto(3) loop with the count as a block argument.
while handles open-ended repetition with an explicit condition.
next skips an iteration inside each, like continue elsewhere.

Keywords and builtins used here

do
end
if
next
puts
while

The run, in numbers

Lines: 14
Characters to type: 187
Tokens: 74
Three-star pace: 90 tpm

At the three-star pace of 90 tokens a minute, this run takes about 49 seconds.

Type this snippet

Step 3 of 3 in Control flow, step 9 of 29 in Language basics.

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Loops in other languages