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MongoDb query condition on comparing 2 fields
I have a collection T , with 2 fields: Grade1 and Grade2 , and I want to select those with condition Grade1 > Grade2 , how can I get a query like in MySQL?
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What is a higher kinded type in Scala?
...of polymorphism/abstraction. It means the same thing for polymorphic types and values. Concretely, a higher-order abstraction abstracts over something that abstracts over something. For types, the term "higher-kinded" is a special-purpose version of the more general "higher-order".
Thus, the higher-...
How do you produce a .d.ts “typings” definition file from an existing JavaScript library?
I'm using a lot of libraries both my own and 3rd party. I see the "typings" directory contains some for Jquery and WinRT... but how are they created?
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How can I make a time delay in Python? [duplicate]
...l... it'll print less frequently than that, because it takes time to print and handle all the buffers that entails (possibly doing a kernel context switch), and to register the alarm signal, but... yeah. A little under once per minute.
– Parthian Shot
Jun 17 '1...
Is it possible for git-merge to ignore line-ending differences?
...13:
More recent git versions authorize using merge with strategy recursive and strategy option (-X):
from "Git Merge and Fixing Mixed Spaces and Tabs with two Branches":
git merge -s recursive -Xignore-space-at-eol
But using "-Xignore-space-change" is also a possibility
Fab-V mentions below:
gi...
How to convert an enum type variable to a string?
...of output, you can define an operator<< that takes an enum parameter and does the lookup for you.
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What is the difference between square brackets and parentheses in a regex?
.../^[789]\d{9}$/
/^[7-9]\d{9}$/
The explanation:
(a|b|c) is a regex "OR" and means "a or b or c", although the presence of brackets, necessary for the OR, also captures the digit. To be strictly equivalent, you would code (?:7|8|9) to make it a non capturing group.
[abc] is a "character class" th...
detect key press in python?
I am making a stopwatch type program in python and I would like to know how to detect if a key is pressed (such as p for pause and s for stop), and I would not like it to be something like raw_input that waits for the user's input before continuing execution. Anyone know how to do this in a while lo...
Android ListView Divider
...why you should use 1px instead of 1dp or 1dip: if you specify 1dp or 1dip, Android will scale that down. On a 120dpi device, that becomes something like 0.75px translated, which rounds to 0. On some devices, that translates to 2-3 pixels, and it usually looks ugly or sloppy
For dividers, 1px is the...
Difference between ProcessBuilder and Runtime.exec()
I'm trying to execute an external command from java code, but there's a difference I've noticed between Runtime.getRuntime().exec(...) and new ProcessBuilder(...).start() .
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