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Rails: How does the respond_to block work?
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No kidding. If you already know how to code, rails might not be for you :-P
– Limited Atonement
Sep 15 at 15:46
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std::shared_ptr of this
... so, you are declaring that the caller shouldn't care about the ownership. Now this can be very limiting, but also by doing so, you must make sure that the child in question won't get destroyed while any weak pointers are still held, if you would use a smart pointer, it would get sorted out by itsel...
Ignore mouse interaction on overlay image
I have a menu bar with hover effects, and now I want to place a transparent image with a circle and a "handdrawn" text over one of the menu items. If I use absolute positioning to place the overlay image above the menu item, the user will not be able to click the button and the hover effect will not...
how does multiplication differ for NumPy Matrix vs Array classes?
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the key things to know for operations on NumPy arrays versus operations on NumPy matrices are:
NumPy matrix is a subclass of NumPy array
NumPy array operations are element-wise (once broadcasting is accounted for)
NumPy matrix operations foll...
Open a buffer as a vertical split in VIM
...ase your pain by adding the following to your .vimrc
cabbrev vb vert sb
Now you can use it in the following way.
:vb <buffer>
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Instance variable: self vs @
...e birthdate and then calculate age based on the difference in time between now and the birthdate -- then the code depending on the method doesn't need to change. If it used the property directly, then the change would need to propagate to other areas of the code. In this sense, using the property ...
How do you do a ‘Pause’ with PowerShell 2.0?
... 1. I don't agree ISE was out of scope, but that's irrelevant now. 2. I was noting it doesn't work in the ISE to assist passers-by on this question.
– Bill_Stewart
Aug 11 '17 at 9:10
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Why are ToLookup and GroupBy different?
...different. Calling ToLookup means I want a cache of the entire thing right now organized by group. Calling GroupBy means "I am building an object to represent the question 'what would these things look like if I organized them by group?'"
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Does Python support multithreading? Can it speed up execution time?
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My bad, didnt see your updated answer until now, where you gave some nice examples of thread usage. These included (correct me if Im wrong) network programming (eg urllib.urlopen()?), to call one Python script from within a Python GUI, and calling multiple PIL (eg Imag...
How to override to_json in Rails?
...e creation of the json should be separate from the rendering of the json.
Now, anytime to_json is called on an object, as_json is invoked to create the data structure, and then that hash is encoded as a JSON string using ActiveSupport::json.encode. This happens for all types: object, numeric, date,...