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How to Sync iPhone Core Data with web server, and then push to other devices? [closed]
...y Chris. For an in-depth, theoretical discussion of syncing, see the paper from Russ Cox (MIT) and William Josephson (Princeton):
File Synchronization with Vector Time Pairs
which applies equally well to core data with some obvious modifications. This provides an overall much more robust and relia...
List of Delphi language features and version in which they were introduced/deprecated
...in Delphi 3
What's New in Delphi 2
Delphi 1 Features
The full list from Embarcadero: What's New
See also: David I's list
To summarize:
Delphi 10.3.x, 10.4 (not yet out, this is speculative)
Custom managed records
Nullable types
Support for macOS 64-bit
Support for Android 64-b...
Rails Console: reload! not reflecting changes in model files? What could be possible reason?
...
Are you reloading the object from the database?
For example:
>> a = User.last
=> #<User id: 16, email: "asdfadsf@sdfdsf.com">
>> reload!
Reloading...
=> true
'a' won't reflect any changes to your model until you reload it from...
How do you do relative time in Rails?
...e looking for the time_ago_in_words method (or distance_of_time_in_words), from ActiveSupport. Call it like this:
<%= time_ago_in_words(timestamp) %>
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How to get the first element of the List or Set? [duplicate]
...
useful if you just want to get anything from the set, as quickly as possible
– HaydenKai
Sep 13 '16 at 23:10
12
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How can I deploy/push only a subdirectory of my git repo to Heroku?
...ill (as of 1.8.0.2) not included via the git installer. Luckily installing from source is quick and straightforward, this page worked for me on mac.
– dribnet
Dec 29 '12 at 22:19
1...
Underscore: sortBy() based on multiple attributes
...de below I create a new array of patients sorted by Name within RoomNumber from the original array called patients.
var sortedPatients = _.chain(patients)
.sortBy('Name')
.sortBy('RoomNumber')
.value();
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np.mean() vs np.average() in Python NumPy?
...n some cases. I have a very large single-precision array that is accessed from an h5 file. If I take the mean along axes 0 and 1, I get wildly incorrect results unless I specify dtype='float64':
>T.shape
(4096, 4096, 720)
>T.dtype
dtype('<f4')
m1 = np.average(T, axis=(0,1)) ...
How do I write a “tab” in Python?
...f some of the more useful escape sequences and a description of the output from them.
Escape Sequence Meaning
\t Tab
\\ Inserts a back slash (\)
\' Inserts a single quote (')
\" Inserts a double quote (")
\n ...
What's the function like sum() but for multiplication? product()?
...gested, it is not hard to make your own using reduce() and operator.mul():
from functools import reduce # Required in Python 3
import operator
def prod(iterable):
return reduce(operator.mul, iterable, 1)
>>> prod(range(1, 5))
24
Note, in Python 3, the reduce() function was moved to t...