Sometimes we need to convert the full array into a string. This could be required for various purposes. ADVERTISEMENT For example, you may have an array containing the first and last names of a user. So to get their full name, you need to combine the array elements. ...
# 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...
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...
<p> Depending on whether your comma-separated string has whitespaces, you can do the following to convert it to an array in Ruby: </p> <ul> <li><a data-topic-href="Convert Comma-Separated String With No Spaces to an Array">Convert Comma-Separate
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. ...
一句会出现“Can't convert CsvRow to Array(CsvRow#to_ary gives String)”的错误,提示给定String的情况下未定义CsvRow。 但如果去掉to_ary跟method_missing的定义,只定义to_s,则可以正常输出。 这是因为:puts默认调用对象的to_ary函数,找不到时才会试着调用to_s。所以只定义to_s的情况下会正常输出。而如果...
{ "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...
send("reverse", &[]) }; // We must try to convert the AnyObject // type back to our usable type. match b.try_convert_to::<RString>() { Ok(ruby_string) => ruby_string.to_string(), Err(_) => "Fail!".to_string(), } } #[test] fn it_works() { // Rust projects ...
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...
?> Array.methods => [:[], :try_convert, :allocate, :new, :superclass, :freeze, :===, :==, :<=>, :<, :<=, :>, :>=, :to_s, :inspect, :included_modules, :include?, :name, :ancestors, :instance_methods, :public_instance_methods, :protected_instance_methods, :private_inst...