helper.rb

# Formats a +number+ into an abbreviated string suitable for
# displaying social media type metrics
#
# ==== Options
# * start_at - The first number to start abbreviating, defaults
#   to 10_000. Certain metrics may want to start at e.g. 1000.
#
# ==== Examples
# number_to_social(123)                     # => 123
# number_to_social(1457)                    # => 1457
# number_to_social(9987)                    # => 9987
# number_to_social(10512)                   # => 10.5K
# number_to_social(2_300_123)               # => 2.3M
# number_to_social(1457, start_at: 1000)    # => 1.4K
def number_to_social(number, start_at: 10_000)
  return number_with_delimiter(number) if number < start_at

  number_to_human(number,
    precision: 1,
    round_mode: :down,
    significant: false,
    format: "%n%u",
    units: { thousand: "K", million: "M", billion: "B" }
  )
end