Remove yourself from Slack channels en-masse

slack_leave_channels_mass.rb

#
# Slack hack:: slack_leave_channels_mass
# Description:: Remove yourself from IM-channels in mass

require "slack"
require "progress_bar"

class Array
  include ProgressBar::WithProgress
end

Slack.configure do |config|
  config.token = ENV['SLACK_API_TOKEN']
  fail 'Missing ENV[SLACK_API_TOKEN]!' unless config.token
end

# Slack.configure do |config|
#   config.token = "YOUR TOKEN HERE"
# end

channels = Slack.channels_list["channels"]
channels.each_with_progress do  |channel|
  if channel["name"].start_with?("im-") && channel["is_member"] == true
    Slack.channels_leave(:channel => channel["id"])
  end
end