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Select multiple records based on list of Id's with linq
...gt; id, (up, id) => up);
And now result of my measurement. I generated 100 000 UserProfiles and 100 000 ids. Join took 32ms and .Where with .Contains took 2 minutes and 19 seconds! I used pure IEnumerable for this testing to prove my statement. If you use List instead of IEnumerable, .Where and ...
Getting the IP address of the current machine using Java
... new DatagramSocket()){
socket.connect(InetAddress.getByName("8.8.8.8"), 10002);
ip = socket.getLocalAddress().getHostAddress();
}
This way works well when there are multiple network interfaces. It always returns the preferred outbound IP. The destination 8.8.8.8 is not needed to be reachable....
Why is enum class preferred over plain enum?
... workmate adds carelessly a new value to our enum:
E_DEVIL_FRUIT = 0x100, // New fruit, with value greater than 8bits
The compiler doesn't complain about it! It just resizes the type to fit all the values of the enum (assuming that the compiler were using the smallest type possible, which is...
Adding parameter to ng-click function inside ng-repeat doesn't seem to work
...y(tablePanel).append(elem);
console.log("timeout");
},100);
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What do the return values of node.js process.memoryUsage() stand for?
...
A picture can be worth 1000 words.
– bmacnaughton
Jul 8 '16 at 12:39
9
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JOIN queries vs multiple queries
...
100
For inner joins, a single query makes sense, since you only get matching rows.
For left joins,...
NumPy: function for simultaneous max() and min()
...90
And now we're in a place where we can test it:
import timeit
size = 100000
repeat = 10000
print timeit.timeit(
'np.min(a); np.max(a)',
setup='import numpy as np; a = np.arange(%d, dtype=np.float32)' % size,
number=repeat), " # numpy min/max"
print timeit.timeit(
'untitled.mi...
Is there a generator version of `string.split()` in Python?
... where memory isn't an issue anyway.
Tested using timeit on:
the_text = "100 " * 9999 + "100"
def test_function( method ):
def fn( ):
total = 0
for x in method( the_text ):
total += int( x )
return total
return fn
This raises another question as to...
Global and local variables in R
...
Here you have a small example:
test.env <- new.env()
assign('var', 100, envir=test.env)
# or simply
test.env$var <- 100
get('var') # var cannot be found since it is not defined in this environment
get('var', envir=test.env) # now it can be found
...
Converting between strings and ArrayBuffers
...4,114,97,121,32,99,111,110,118,101,114,116,
101,100,32,116,111,32,97,32,115,116,114,105,110,103]);
console.log(enc.decode(arr));
The MDN StringView library
An alternative to these is to use the StringView library (licensed as lgpl-3.0) which goal is:
to cre...