Test #

require 'test/unit'
require_relative '../src/15_class'

class PersonTest < Test::Unit::TestCase
  def testCore
    peter = Person.new('Peter')
    peter.sex = 'male'
    assert_equal('male', peter.sex)
  end
end

Log #

caller #

caller 用于打印方法的调用栈

def c
  puts "I'm in C. You know who called me?"
  puts caller
end

def b
  c
end

def a
  b
end

a

以上会输出

I'm in C. You know who called me?
34_log.rb:7:in `b'
34_log.rb:11:in `a'
34_log.rb:14:in `<top (required)>'
-e:1:in `load'
-e:1:in `<main>'

Logging #

创建 Logger 对象

require 'logger'
logger = Logger.new($stdout)
logger.warn('This is a warning')
logger.info('This is an info')

设置 Log 级别

logger.level = Logger::INFO
logger.debug('(INFO) This a debug message')
logger.unknown('(INFO) Something unknown. Oh, mystery and suspense!')
logger.error('(INFO) Error! Run! Panic!')
logger.warn('(INFO) This is a warning.')

Benchmark #

Benchmark 用于计算方法的执行时间

require 'benchmark'

puts Benchmark.measure { 602214.times { 3.14159 * 6.626068 } }

或者以下方法

n=4000
Benchmark.bm do |benchmark|
  benchmark.report do
    a=[]; n.times { a = a + [n] }
  end
  benchmark.report do
    a=[]; n.times { a << n }
  end
  benchmark.report do
    a=[1..n].map {|number| number}
  end
end