Ruby 与Python、Scala 类似,在一切皆是对象(Seeing Everything as an Object)的基础上,支持函数式编程,这意味着函数是一等成员,可以作为参数传入,也可以作为函数值返回。 但是,Ruby 中的函数并没有其他动态语言中那么简单,它提供了Method与Proc两个类来表示函数的概念,对于这两个类的区别无论是官方文档还是 Stack...
Ruby is an interpreted object-oriented programming language often used for web development. It also offers many scripting features to process plain text and serialized files, or manage system tasks. It is simple, straightforward, and extensible....
With direct subclasses of BasicObject, using is_a? is not an option since BasicObject doesn’t provide that method (it’s defined in Object). In those rare cases it’s OK to use ===. is_a? vs kind_of? Prefer is_a? over kind_of?. The two methods are synonyms, but is_a?
$ irb>defadd(a,b)>a+b>end>method(:add)=>#<Method:Object#add># 上面 ruby 的例子中,使用了 Symbol 来表示 add 方法,这是由于 ruby 中直接写 add 表示函数调用>1.methods=>[:%,:&,:*,:+,:-,:/,...] 可以看到,在 python、ruby 中,像1这样的数字字面量也是对象。 lambda 表达式 lambda ...
It can traverse a given object and assign its value if it matches a pattern. require "json" json = <<END { "name": "Alice", "age": 30, "children": [{ "name": "Bob", "age": 2 }] } END case JSON.parse(json, symbolize_names: true) ...
Simply run ruby with --yjit-stats to compute and dump stats (incurs some run-time overhead). YJIT is now optimized to take advantage of object shapes. [Feature #18776] Take advantage of finer-grained constant invalidation to invalidate less code when defining new constants. [Feature #18589...
而JRuby的实现并没有这种限制, 可以直接Map Ruby Thread to JVM thread. 因此，从一定角度上看，在...
# Enjoy the automatic Object-Relation Mapping cty = Country.find('CN') puts 'CN refers to [' + cty.name + ']' puts '[' + cty.name + '] is in [' + cty.region.name + ']' puts rgn = Region.find(cty.region.id) puts 'Countries in the same region with [' + cty.name + ...
which means there is a N+1 query from the Post object to its Comment association. In the meantime, there's a log appended intolog/bullet.logfile 2010-03-07 14:12:18[INFO] N+1 Query in /posts Post => [:comments] Add to your finder: :include => [:comments] 2010-03-07 14:12:...
Object containing plugin and Sass options. bundleExec Type:boolean Default:false Run Sass withbundle exec. sourcemap Type:boolean Default:false Initialize and pass Sass sourcemaps togulp-sourcemaps. Note this option replaces Sass'ssourcemapoption. ...