endless_range_operator.md

🌊 Endless Ranges for Infinite Sequences

Endless ranges (start..) let you represent an unbounded interval starting at start. They work with methods like take_while, lazy, or iteration protocols to generate or filter items without a fixed endpoint.

# Generate all integers from 10 upwards, filtering even ones
evens = (10..).lazy.select(&:even?).first(5)
puts evens.inspect # => [10, 12, 14, 16, 18]

# Stream lines from STDIN until a blank line
STDIN.each_line.take_while { |line| !(line.strip.empty?) }.each do |l|
  puts l.upcase
end