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Python: fastest way to create a list of n lists
...
The probably only way which is marginally faster than
d = [[] for x in xrange(n)]
is
from itertools import repeat
d = [[] for i in repeat(None, n)]
It does not have to create a new int object in every iteration and is about 15 % faster on my machine.
Edi...
Test for existence of nested JavaScript object key
...bj /*, level1, level2, ... levelN*/) {
var args = Array.prototype.slice.call(arguments, 1);
for (var i = 0; i < args.length; i++) {
if (!obj || !obj.hasOwnProperty(args[i])) {
return false;
}
obj = obj[args[i]];
}
return true;
}
var test = {level1:{level2:{level3:'leve...
Calling async method synchronously
...nc().Result;
Note: In some cases, this might lead to a deadlock: Your call to Result blocks the main thread, thereby preventing the remainder of the async code to execute. You have the following options to make sure that this doesn't happen:
Add .ConfigureAwait(false) to your library method or...
Writing a Python list of lists to a csv file
...It kinda makes sense in hindsight, but not informative of where to look at all.
– Rambatino
May 25 '18 at 7:30
...
Regex Named Groups in Java
...000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 47.1084 7.58816C47.4091 7.46349 47.7169 7.36433 48.0099 7.26993C48.9099 6.97997 49.672 6.73443 49.672 5.93063C49.672 5.22043 48.9832 4.61182 48.1414 4.61182C47.4335 4.61182 46.7256 4.91628 46.0943 5.50789C45.7307 4.9328 4...
Chrome, Javascript, window.open in new tab
...pup’) by specifying options in the 3rd parameter
3. If the window.open call was not part of a user-initiated event, it’ll open in a new window.
4. A “user initiated event” does not have to the same function call – but it must originate in the function invoked by a user click
5. If a use...
How to trigger event when a variable's value is changed?
...|
edited Apr 23 '18 at 23:32
answered Apr 30 '11 at 14:25
J...
BLE协议—广播和扫描 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...的observer（扫描者）。数据包：数据包Access Address为一个32bit的随机值，由Initiator生成。数据包，其实是数据信道上的空中包的简称，数据包只在数据信道上传输，即除37/38/39之外的其余37信道（BLE总共占用40个信道）。每建立一次...
How can I expand the full path of the current file to pass to a command in Vim?
... Umber FerruleUmber Ferrule
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5
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'is' versus try cast with null check
...0000: nop
IL_0001: ldc.i4.5
IL_0002: box System.Int32
IL_0007: stloc.0 // o
IL_0008: ldloc.0 // o
IL_0009: isinst System.Int32
IL_000E: ldnull
IL_000F: cgt.un
IL_0011: stloc.1
IL_0012: ldloc.1
IL_0013: brfalse.s IL_001E
IL_0015: n...