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Create a new Ruby on Rails application using MySQL instead of SQLite
I want to create my Rails application with MySQL, because I like it so much. How can I do that in the latest version of Rails instead of the default SQLite?
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Add up a column of numbers at the Unix shell
Given a list of files in files.txt , I can get a list of their sizes like this:
20 Answers
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What is an example of the Liskov Substitution Principle?
I have heard that the Liskov Substitution Principle (LSP) is a fundamental principle of object oriented design. What is it and what are some examples of its use?
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drag drop files into standard html file input
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The following works in Chrome and FF, but i've yet to find a solution that covers IE10+ as well:
// dragover and dragenter events need to have 'preventDefault' called
// in order for the 'drop' event to register.
// See: https://devel...
Set operations (union, intersection) on Swift array?
..."}
If you're using custom structs, you need to implement Hashable.
Thanks to Michael Stern in the comments for the Swift 2.0 update.
Thanks to Amjad Husseini in the comments for the Hashable info.
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Is there a Google Keep API? [closed]
Is there a API for Google Keep? I want to make a windows 8 app for Google Keep, so that it synchronizes with your phone.
3...
Response.Redirect with POST instead of Get?
We have the requirement to take a form submission and save some data, then redirect the user to a page offsite, but in redirecting, we need to "submit" a form with POST, not GET.
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In Python, how does one catch warnings as if they were exceptions?
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To quote from the python handbook (27.6.4. Testing Warnings):
import warnings
def fxn():
warnings.warn("deprecated", DeprecationWarning)
with warnings.catch_warnings(record=True) as w:
# Cause all warnings to always be triggered.
warnings.sim...
Exact difference between CharSequence and String in java [duplicate]
... actually does require a String.
Also note that maps should use String as key type, not CharSequence, as map keys must not change. In other words, sometimes the immutable nature of String is essential.
Specific code snippet
As for the code you pasted: simply compile that, and have a look at the J...
How to convert 2D float numpy array to 2D int numpy array?
...ay to int numpy array?
Tried using map directly to array but it did not work.
4 Answers
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