built-in

If I have arr = [1, 2, 3, 4] I know I can do the following... > arr.each_slice(2) { |a, b| puts "#{a}, #{b}" } 1, 2 3, 4 ...And... > arr.each_with_index { |x, i| puts "#{i} - #{x}" } 0 - 1 1 - 2 2 - 3 3 - 4 ...But is there a built in way to do this? > arr.each_slice_with_index(2) { |i, a, b| puts "#{i} - #{a}, #{b}" } 0 - 1, 2 2 - 3, 4 I know I can built my own and stick it into the array method. Just looking to see if there is a built in function to do this. Like most iterator methods, each_slice returns an enumerable when called without a block since ruby 1.8.7+, which you can then call

The format function in builtins seems to be like a subset of the str.format method used specifically for the case of a formatting a single object. eg. >>> format(13, 'x') 'd' is apparently preferred over >>> '{0:x}'.format(13) 'd' and IMO it does look nicer, but why not just use str.format in every case to make things simpler? Both of these were introduced in 2.6 so there must be a good reason for having both at once, what is it? Edit: I was asking about str.format and format , not why we don't have a (13).format I think format and str.format do different things. Even though you could use str

Does anyone happen to know where, if at all possible, I can take a look at the code of the java's built-in libraries? I've tried Ctrl + Shift + B (which is the Netbeans' equivalence of Eclipse's Ctrl + Shift T ) to "go to source", but I can only see the method header, and the body is always: //compiled code throw new RuntimeException("Compiled Code"); For instance, I'd see the following if I tried to view String.charAt(int) public char charAt(int i) { //compiled code throw new RuntimeException("Compiled Code"); } built-in libraries source code is available with jdk. For example on a windows

Is there any in-built stable sort routine in .NET? I know that C++ has an in-built sort routine under "algorithms" std::sort() . Likewise, do we have something to use along with C#? Also, is there any in-built swap function in .NET? Doc Brown Using "C# stable sort" in Google revealed this SO post as top result: Is the sorting algorithm used by .NET's `Array.Sort()` method a stable algorithm? So the answer is: Enumerable.OrderBy is a stable sort function, not built into C#, but part of the .NET framework libraries. Concerning "Swap": I don't know of any prebuilt generic swap function in the

When working with built-in types like int and float in Python, it's common to employ exception handling in cases where input might be unreliable: def friendly_int_convert(val): "Convert value to int or return 37 & print an alert if conversion fails" try: return int(val) except ValueError: print('Sorry, that value doesn\'t work... I chose 37 for you!') return 37 Are there any prominent edge-cases to be aware of when using str() ? def friendly_str_convert(val): "Convert value to str or return 'yo!' & print an alert if conversion fails" try: return str(val) except Exception: # Some specific

Suppose I have my own function named zeros on the Matlab path. Now I want to call the built-in zeros . How can I do that? sitic Use the builtin function: builtin(function, arg1, ..., argN) In your case e.g.: builtin('zeros', 50) 来源： https://stackoverflow.com/questions/18205644/how-to-unhide-an-overriden-function