然而，我们完全不清楚你是如何得到一个String而不是一个Array of Symbols的，Rails指南中关于复合键的内...
1Data Source Prepare the CSV code to convert into Ruby Array. We do not store any of your data. 2Table Editor An Excel-like editor to easily edit CSV data. 3Table Generator Copy or download the converted Ruby Array data.Data Source CSV Excel CSV XML HTML Table Markdown Table JSON Arr...
to convert the argument with to_s. (Values interpolated into double-quoted strings, however, are automatically converted with to_s.) 内建的方法通常不会自动调用。如果你调用一个参数为String的方法,却传递一个其他类型的对象给它,该方法是不会主动调用参数的to_s方法来进行转换的。(然后,对于那些内插在...
characters also serve to delimit string, regular expression, array, and hash literals, and to group and separate expressions, method arguments, and array indexes. We’ll see miscellaneous other uses of punctuation scattered throughout Ruby syntax. 标识符: 标识符不包含标点符号。 以从A到Z这26个大...
To convert Ruby array to JSON: person1 = Person.new(name: 'John Doe') person2 = Person.new(name: 'Joe Sixpack') Person.to_json([person1, person2], pretty: true) # or Person.to_yaml([person1, person2]) # or Person.to_csv([person1, person2]) # => # # [ # { "name":...
RDO uses Symbols as keys in the hashes that represent data rows. Most of the time this is desirable. If you query for something that returns field names containing spaces, or punctuation, you need to convert a String to a Symbol using #to_sym or #intern. Or use a quoted Symbol-literal...
* `Array#to_sentence` no longer returns a frozen string. Before: ['one', 'two'].to_sentence.frozen? # => true After: ['one', 'two'].to_sentence.frozen? # => false *Nicolas Dular* * When an instance of `ActiveSupport::Duration` is converted to an `iso8601` duration string, if...
=> Array >> a.length => 3 >> a.size => 3 >> a[2] => 3 >> a << 4 => [1, 2, 3, 4] >> a => [1, 2, 3, 4] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 其中类型不必相同,可以同时是 String 、Number 等 ?> a = [1, "Grac Kanil", [2, 3]] ...
to convert with to_str method. *\post the object referred by \p namep is a Symbol or a * Stringif non-nil value is returned, or is a String * ifnil is returned. */ VALUE rb_check_symbol(volatile VALUE*namep) { VALUE sym; VALUE tmp; VALUE name ...
Ruby 中还定义了 to_str、to_int、to_ary 和 to_hash,用于方法进行隐式的转换。不过在内建类里,这些转换方法并没有被普遍的实现。 在Ruby1.9 里,内建的 String、Array、Hash、Regexp 及 IO 类都定义了一个名为 try_convert 的类方法。如果这个方法的实参定义了以上一个合适的隐式转换方法,那么就会对其方...