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JavaScript String as Array: Read but no Write

For JavaScript in most browsers*, you can read a character from a String by treating it like an Array.However, in all the browsers I\'ve tried (IE9, Chrome, Firefox), you can\'t write to it like an Ar[详细]

2023-03-26 03:35 分类：问答
Why does Python treat tuples, lists, sets and dictionaries as fundamentally different things?

One of the reasons I love Python is the expressive power / reduced programming effort provided by tuples, lists, sets and dictionaries.Once you understand list comprehensions and a few of the basic pa[详细]

2023-03-25 19:29 分类：问答
Why do some variables being uninitialized cause an error, while others cause a warning?

The blog post Uninitialized variables points out that uninitialized class variables, local variables and constants cause an exce开发者_运维问答ption (after going through method_missing or their equiva[详细]

2023-03-25 11:45 分类：问答
Why must we define both == and != in C#?

The C# compiler requires that whenever a custom type defines operator ==, it must also define != (see here).[详细]

2023-03-25 07:10 分类：问答
Why are slices in Python 3 still copies and not views?

As I only now noticed after commenting on this answer, slices in Python 3 return shallow copies of whatever they\'re slicing rather than views. Why is this still the case? Even leaving aside numpy\'s[详细]

2023-03-24 03:42 分类：问答
What are the benefits of types being first-class objects?

Does anybody here have good examples where types as first-class objects come in hand? I guess it helps to straightforwardly implement some math concep开发者_开发百科ts, indeed that is the kind of exa[详细]

2023-03-22 18:18 分类：问答
In which languages is `if (x)` a legal test for nonzero value?

I\'m curious how universal the language paradigm is of allowing plain if (x) ... to check for nonzero value (on an integer variable, at least)?[详细]

2023-03-21 18:25 分类：问答
Why HttpRequest.HttpMethod is string instead of Enum?

In the Reference of HttpRequest.HttpMethod of .NET Framework, request type is declared with System.String type.[详细]

2023-03-21 07:06 分类：问答
Is there a better PHP way for getting default value by key from array (dictionary)?

In Python one can do: foo = {} assert foo.get(\'bar\', \'开发者_运维技巧baz\') == \'baz\' In PHP one can go for a trinary operator as in:[详细]

2023-03-20 14:06 分类：问答
Differences when overriding inherited constructor fields?

Consider this simple Scala class: class A(val d: Int) Is there a difference in Scala (either in behaviour or generated bytecode) between[详细]

2023-03-19 07:13 分类：问答