Ray's playground

摘要： This chapter is full of little things that need to beimproved in the future.I don't fullyunderstand some of them. 阅读全文

摘要： [代码]Output: dogs3dog2[代码]Output: dogs3dog2　　 quite1f.b.i1the1fella1that1man-about-town1he's1 阅读全文

摘要： If you're processing an ASCII document, then each byte corresponds to one character. Use String#each_byte to yield each byte of a string as a number, which you can turn into a one-character string:[代码... 阅读全文

摘要： To turn a symbol into a string, use Symbol#to_s, or Symbol#id2name, for which to_s is an alias.[代码]Output:a_symbol　　　　AnotherSymbol　　　　Yet another symbol!You usually reference a symbol by just typing ... 阅读全文

摘要： Mapping class inheritanceA simple strategy for mapping classes to database tables might be “one table for every class.” This approachsounds simple, and it works well until you encounter in... 阅读全文

摘要： To see the ASCII code for a specific character as an integer, use the ? operator:[代码]Output: 97To see the integer value of a particular in a string, access it as though it were an element of an array:... 阅读全文

摘要： Ruby gives you a number of escaping mechanisms to refer to unprintable characters. By using one of these mechanisms within a double-quoted string, you can put any binary character into the string.[代码]... 阅读全文

摘要： [代码][代码][代码] 阅读全文

摘要： It's worth reflecting on why a generator is so perfectly suitable for implementing an unbounded sequence and letting you work with it. Syntactically, a generator is "just" a function containing the ke... 阅读全文

摘要： [代码]Output: 2 阅读全文