其实python和ruby非常接近,比大多数别的语言要接近的多,所以喜欢用啥就用啥(大实话,虽然也是废话)。语法上的差别虽然有那么一点,大部分是syntax sugar,我斗胆稍微列几个(python我也忘得差不多了,不对的大家尽管来鞭尸吧),但是主要差异还是设计思想上的:灵活vs明确. 我不认为两者在生产力上会有什么差别,如果你熟...
多个单字符选项可以合并,例如下面俩个命令作用等同。 $ruby -ne 'print if /Ruby/' /usr/share/bin $ruby -n -e 'print if /Ruby/' /usr/share/bin 2.3Ruby环境变量 Unix/linux, 可以查看.env文件查看环境变量。 编辑器: ubuntu 18 下我用nano. 也安装了Visual Studio Code。 任何你顺手的编辑器都可...
Parallel Assignment(交换参数) You can swap the values in variables without the use of a temp variable. Remember your first programming class: Swap the values in "i" and "j"? You had to use a "t" variable to store one of the values first. Not needed in Ruby. 1 2 3 4 5 i =0 ...
但是,如果ruby遇到运算符,如+, - ,或在一行的末尾的反斜杠,他们的声明中表示延续. 标识符名称的变量,常量和方法。 Ruby的标识符是大小写敏感。这意味着Ram和RAM是两个不同的标识符在Ruby. Ruby注释开始与pound/sharp (#)字符,去行结束(EOL). 保留字: 以下列表显示了在Ruby中的保留字。然而,这些保留字不应...
Simple Syntax Normal Object-oriented Features (e.g. class, method calls) Advanced Object-oriented Features (e.g. mix-in, singleton-method) Operator Overloading Exception Handling Iterators and Closures Garbage Collection Dynamic Loading of Object Files (on some architectures) Highly Portable (works ...
, and + operators. Al Aho's egrep, which first appeared in the Seventh Edition (1979), was the first Unix tool to provide the full regular expression syntax, using a precomputed DFA. By the Eighth Edition (1985), egrep computed the DFA on the fly, like the implementation given above....
+$/ puts "It's a valid match" # check any string by comparing against the String class, "any string" when String puts "It's a String" end # using short syntax case input when 19 then puts "It's 19" end # optional fallthrough case input when 19 then puts "It's 19" else ...
(\\0, ifno argument)", "-a autosplitmode with -n or -p (splits $_ into $F)", "-c check syntax ", "-d set debugging flags (set $DEBUG to true)", "-e 'command' one line ofscript. Several -e's allowed. Omit [programfile], "-Fpattern split() pattern for ...
So, as a general principle, only build DSLs if you, other developers, or the end users of your application will be getting a lot of use out of them. If you do create a DSL, make sure to include a comprehensive test suite with it, as well as properly document its syntax as it can...
AS_IF([test "$rb_cv_gcc_sync_builtins" = yes], [ AC_DEFINE(HAVE_GCC_SYNC_BUILTINS) ]) AC_CACHE_CHECK(for __builtin_unreachable, rb_cv_func___builtin_unreachable, [RUBY_WERROR_FLAG( [AC_LINK_IFELSE([AC_LANG_PROGRAM([[volatile int zero;]], ...