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容也没有解释你是如何得到这种状态的。我不得不假设您从表单输入或URI参数（两者都表示为字符串）获取数据，而不是将元素解析为 * 单独的 * 列名，以便您可以从两个String值正确地形成复合键。关于表单中
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...
# convert the integers to String before the joinarray = []10_000_000.times { |num| array << num.to_s }array.join 嗯...🤔 现在更像是 1.3 秒。做出这种改变似乎缩短了半秒钟。但是仅仅实例化一个可变字符串以将整数推入不是更有意义吗？那么，就没有必要加入了。# instantiate a String inst...
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...
a = "Ruby" # One reference to one String object b = c = "Ruby" # Two references to another String object a.equal?(b) # false: a and b are different objects b.equal?(c) # true: b and c refer to the same object By convention, subclasses never override the equal? method. ...
{ "owner": "preston", "repo_name": "idclight", "repo_url": "https://github.com/preston/idclight", "description": "A Ruby gem for accessing the freely available IDClight (IDConverter Light) web service, which convert between different types of gene IDs such as Hugo and Entrez. Querie...
See magnus::TryConvert for more details. Rust function argumentaccepted from Ruby i8,i16,i32,i64,isize, magnus::Integer Integer, #to_int u8,u16,u32,u64,usize Integer, #to_int f32,f64, magnus::Float Float, Numeric String, PathBuf, char, magnus::RString, bytes::Bytes‡ String, #...
但不能和数字合并'hello '+'world'#=> "hello world"'hello '+3#=> TypeError: can't convert Fixnum into String'hello '+3.to_s#=> "hello 3"# 合并字符串及其运算符'hello '*3#=> "hello hello hello "# 字符串追加'hello'<<' world'#=> "hello world"# 打印输出,并在末尾加换行符puts...
* `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...
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...