Cheng

Cheng has asked 19 questions and find answers to 6 problems.

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Cheng questions

How to eliminate duplicate calculation in SQL?
Can regular file reading benefited from nonblocking-IO?
Why doesn't RVM work in a bash script like it works in an interactive shell?
Why doesn't Ruby have a ThreadPool built-in?
Can't use an array as default values for Ruby Hash? [duplicate]
How to performance/benchmark testing a Rails app with real world database?
What's the difference between () and [] in a regex?
What's the difference of using #!/usr/bin/env or #!/bin/env in shebang?
Give me a example of non-RESTful design?
How to list local-variables in Ruby?

Cheng answers

Ignore header line when parsing CSV file
Rails select helper - Default selected value, how?
Hadoop MapReduce provide nested directories as job input