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What is Virtual DOM?
...tically huge. Finding and updating a node/nodes in case of an event is not time efficient.
VDOM solves this problem by creating a high label abstraction of actual dom. The VDOM is a high level lightweight in-memory tree representation of actual DOM.
For example, consider adding a node in DOM; re...
How do I make the first letter of a string uppercase in JavaScript?
...uage feature. Just because Prototype.js extended Object itself for a brief time, doesn't mean extending Natives is bad. You shouldn't do it if you're writing code for an unknown consumer (like an analytics script that goes on random sites), but other than that it's fine.
– csuw...
Can I “multiply” a string (in C#)?
...g();
return _s;
}
I think I pulled that one from Stack Overflow some time ago, so it is not my idea.
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Apache Spark: The number of cores vs. the number of executors
...s 100% limited by concurrency (the number of threads). We would expect runtime to be perfectly inversely correlated with the number of threads.
ratio_num_threads = nthread_job1 / nthread_job3 = 15/24 = 0.625
inv_ratio_runtime = 1/(duration_job1 / duration_job3) = 1/(50/31) = 31/50 = 0.62
So rati...
Efficient Algorithm for Bit Reversal (from MSB->LSB to LSB->MSB) in C
...F, 0xBF, 0x7F, 0xFF
};
unsigned int v; // reverse 32-bit value, 8 bits at time
unsigned int c; // c will get v reversed
// Option 1:
c = (BitReverseTable256[v & 0xff] << 24) |
(BitReverseTable256[(v >> 8) & 0xff] << 16) |
(BitReverseTable256[(v >> 16) &...
Compare given date with today
...
strtotime($var);
Turns it into a time value
time() - strtotime($var);
Gives you the seconds since $var
if((time()-(60*60*24)) < strtotime($var))
Will check if $var has been within the last day.
...
TypeScript function overloading
...ypeScript would do it if there was a reliable way of checking types at run time.
– thorn̈
Mar 14 '16 at 23:04
4
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Getting all names in an enum as a String[]
...
Why call values() 13 times, generating a new array each time, instead of caching the array in a local variable? Why use toString(), which is overridable, instead of name()?
– JB Nizet
Dec 9 '12 at 0:12
...
Sending a mail from a linux shell script
...t; is used to redirect standard input. It's been a part of bash for a long time.
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Java - get pixel array from image
...aster than the first approach.
In my application I was able to reduce the time of processing the pixels by more than 90% by just switching from the first approach to the second!
Here is a comparison I've setup to compare the two approaches:
import java.awt.image.BufferedImage;
import java.awt.ima...