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,如果你熟悉的话。*注
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...
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 ...
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 ...
if cond puts "true" else puts "false" end 1. 2. 3. 4. 5. 6. 转换为如下的S表达式 (if (lvar cond) (fcall “puts” “trued”) (fcall “puts” “false”)) 1. 2. 3. 图1-10 mruby 语法树的结构 (3) 代码生成 在代码生成处理中,除了遍历语法分析处理中生成的树结构之外,还会生成虚拟...
close_spider if failed? && Tanakai.env == "production" send_error_notification(run_info[:error]) else # Do nothing end end # ... end Parallel crawling using in_parallel Tanakai can process web pages concurrently in one single line: in_parallel(:parse_product, urls, threads: 3), where...
, 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....
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...
if std.type(benchs) == "string" then error "benchs must be an array" else std.join(post_process_and_upload_results_wait, std.map(mx_benchmark, benchs)) + post_process_and_upload_results, runner: { local benchmarks_to_run = self.benchmarks, run+: benchmark(benchmarks_...
AS_IF([test "$rb_cv_va_args_macro" = yes], [ AC_DEFINE(HAVE_VA_ARGS_MACRO) ]) AC_CACHE_CHECK([for alignas() syntax], rb_cv_have_alignas, [ rb_cv_have_alignas=no # Prefer alignas over _Alignas to allow C++ compiler to read ruby.h RUBY_WERROR_FLAG([ ...