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Integer division with remainder in JavaScript?
...8 millisec
(a-(a%b))/b // -33, 0.6649 millisec
The above is based on 10 million trials for each.
Conclusion: Use (a/b>>0) (or (~~(a/b)) or (a/b|0)) to achieve about 20% gain in efficiency. Also keep in mind that they are all inconsistent with Math.floor, when a/b<0 &&...
Android Studio - How to increase Allocated Heap Size
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Thx, it's very usefull. FYI, if you use the 64bits version, the file to edit is named studio64.exe.vmoptions.
– Eselfar
Jul 11 '17 at 14:47
add ...
Disable messages upon loading a package
...e:datasets"
[15] "package:methods" "Autoloads"
[17] "package:base"
R>
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Is there a NumPy function to return the first index of something in an array?
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Just to add a very performant and handy numba alternative based on np.ndenumerate to find the first index:
from numba import njit
import numpy as np
@njit
def index(array, item):
for idx, val in np.ndenumerate(array):
if val == item:
return idx
# If no ...
Favicon dimensions? [duplicate]
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philippe_bphilippe_b
31.7k66 gold badges4646 silver badges4242 bronze badges
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Get file size, image width and height before upload
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Example using FileReader API
In case you need images sources as long Base64 encoded data strings
<img src="data:image/png;base64,iVBORw0KGg... ...lF/++TkSuQmCC=">
const EL_browse = document.getElementById('browse');
const EL_preview = document.getElementById('preview');
con...
Impossible to Install PG gem on my mac with Mavericks
.../pg_config
Once done, install the pg gem with
env ARCHFLAGS="-arch x86_64" gem install pg -- --with-pg-config=/usr/local/Cellar/postgresql/9.3.3/bin/pg_config
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Uber5岁了，一次性告诉你它的商业之道 - 资讯 - 清泛网 - 专注C/C++及内核技术
...车站的道路，抗议打车应用软件Uber。
摄影|Laurent Zabulon 图片编辑|何晞宇
强劲的扩张，伴随着出租车业、政府监管部门的阻挠和诉讼。
Uber进入纽约不到一个月，就在“纽约出租车及豪华车组织”的要求下，被迫关闭业务一个...
Are there disadvantages to using a generic varchar(255) for all text-based fields?
...hat in practice stored very short strings.
It's best to define the column based on the type of data that you intend to store. It has benefits to enforce application-related constraints, as other folks have mentioned. But it has the physical benefits to avoid the memory waste I described above.
I...
What's the difference between emulation and simulation? [duplicate]
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Based on software and system engineering experience, I'd summarise the difference as follows:
Simulation: for me, this is always in software - every aspect of the real system is only MODELLED by some code and/or mathematics....