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In Hibernate Validator 4.1+, what is the difference between @NotNull, @NotEmpty, and @NotBlank?
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I spent some time tracking this information down on my own, and I wanted to help others benefit from that effort. "To be crystal clear, it is not merely OK to ask and answer your own question, it is explicitly encouraged." blog.stackoverf...
Call a function after previous function is complete
... all for me. function1 and function2 both get executed at exactly the same time (as observable by the human eye). Here's the tiny example: jsfiddle.net/trusktr/M2h6e
– trusktr
Mar 19 '11 at 8:17
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How to make node.js require absolute? (instead of relative)
.../../../../../../ relative paths problem.
node_modules
People sometimes object to putting application-specific modules into
node_modules because it is not obvious how to check in your internal
modules without also checking in third-party modules from npm.
The answer is quite simple...
Mercurial: how to amend the last commit?
...of everything before you do this!
As a sidenote, I've done it zillions of times on private-only repositories.
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How do I handle the window close event in Tkinter?
...allbacks when the user closes the window...)
from tkinter import *
import time
# Try setting this to False and look at the printed numbers (1 to 10)
# during the work-loop, if you close the window while the periodic_call
# worker is busy working (printing). It will abruptly end the numbers,
# and ...
If my interface must return Task what is the best way to have a no-operation implementation?
... to transform it into a state-machine. It will also create a new task each time you call it. Returning an already completed task would be clearer and more performant.
– i3arnon
Aug 3 '15 at 20:11
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Difference between Fact table and Dimension table?
...with it (Example of dimension tables: Geography, Item, Supplier, Customer, Time, etc.). It would be valid also for the dimension to have a parent, in which case the model is of type "Snow Flake". However, designers attempt to avoid this kind of design since it causes more joins that slow performance...
How to implement common bash idioms in Python? [closed]
...s are all aimed at python people who are afraid of (or don't want to spend time learning) bash, am I right?
– Buttle Butkus
Jul 13 '17 at 7:34
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Add column with number of days between dates in DataFrame pandas
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Assuming these were datetime columns (if they're not apply to_datetime) you can just subtract them:
df['A'] = pd.to_datetime(df['A'])
df['B'] = pd.to_datetime(df['B'])
In [11]: df.dtypes # if already datetime64 you don't need to use to_datetime
O...
Is it better to use std::memcpy() or std::copy() in terms to performance?
...strings using all four SHA-2 versions (224, 256, 384, 512), and I loop 300 times. I measure times using Boost.timer. That 300 loop counter is enough to completely stabilize my results. I ran the test 5 times each, alternating between the memcpy version and the std::copy version. My code takes advant...