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Why is React's concept of Virtual DOM said to be more performant than dirty model checking?
...ut React's diff algorithm here: http://calendar.perfplanet.com/2013/diff/. From what I understand, what makes React fast is:
Batched DOM read/write operations.
Efficient update of sub-tree only.
Compared to dirty-check, the key differences IMO are:
Model dirty-checking: React component is expl...
C# Java HashMap equivalent
Coming from a Java world into a C# one is there a HashMap equivalent? If not what would you recommend?
7 Answers
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Error when changing to master branch: my local changes would be overwritten by checkout
...le and the branch that you are switching to has changes for this file too (from latest merge point).
Your options, as I see it, are - commit, and then amend this commit with extra changes (you can modify commits in git, as long as they're not pushed); or - use stash:
git stash save your-file-name
...
Repository Pattern vs DAL
...e services and the database it will take you down another.
The repository from my perspective is just a clearly specified layer of access to data.Or in other words a standardized way to implement your Data Access Layer. There are some differences between different repository implementations, but th...
When should you use a class vs a struct in C++?
...(supposedly) guaranteed to be laid out as though it were a C struct. Apart from this one exception though, the only difference is as stated.
– workmad3
Sep 18 '08 at 14:22
29
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Can I make a function available in every controller in angular?
If I have a utility function foo that I want to be able to call from anywhere inside of my ng-app declaration. Is there someway I can make it globally accessible in my module setup or do I need to add it to the scope in every controller?
...
How do I get time of a Python program's execution?
...ory, and just insert import timing at the top of my module:
import atexit
from time import clock
def secondsToStr(t):
return "%d:%02d:%02d.%03d" % \
reduce(lambda ll,b : divmod(ll[0],b) + ll[1:],
[(t*1000,),1000,60,60])
line = "="*40
def log(s, elapsed=None):
print lin...
What is Type-safe?
...n be a bit of both: some statically typed languages allow you to cast data from one type to another, and the validity of casts must be checked at runtime (imagine that you're trying to cast an Object to a Consumer - the compiler has no way of knowing whether it's acceptable or not).
Type-safety doe...
Cluster analysis in R: determine the optimal number of clusters
...04935647
[10,] 3.445291 4.369232 0.9239414 0.05055486
Here's the output from Edwin Chen's implementation of the gap statistic:
Seven. You may also find it useful to explore your data with clustergrams to visualize cluster assignment, see http://www.r-statistics.com/2010/06/clustergram-visualiza...
Apply .gitignore on an existing repository already tracking large number of files
...s.
Then run this command:
git rm -r --cached .
This removes everything from the index, then just run:
git add .
Commit it:
git commit -m ".gitignore is now working"
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