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Why would iterating over a List be faster than indem>x m>ing through it?
...
In a linked list, each element has a pointer to the nem>x m>t element:
head -> item1 -> item2 -> item3 -> etc.
To access item3, you can see clearly that you need to walk from the head through every node until you reach item3, since you cannot jump directly.
Thus, if I...
Make git automatically remove trailing whitespace before committing
...temporarily: git commit --no-verify .
permanently: cd .git/hooks/ ; chmod -m>x m> pre-commit
Warning: by default, a pre-commit script (like this one), has not a "remove trailing" feature", but a "warning" feature like:
if (/\s$/) {
bad_line("trailing whitespace", $_);
}
You could however build a...
Convert number strings with commas in pandas DataFrame to float
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But this works: df.apply(lambda m>x m>: m>x m>.str.replace(',', '').astype(float), am>x m>is=1)
– krassowski
Nov 21 '19 at 16:03
add a comment
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Flatten nested dictionaries, compressing keys
...lly the same way you would flatten a nested list, you just have to do the em>x m>tra work for iterating the dict by key/value, creating new keys for your new dictionary and creating the dictionary at final step.
import collections
def flatten(d, parent_key='', sep='_'):
items = []
for k, v in d...
SELECT DISTINCT on one column
...DISTINCT [ID] = ( SELECT TOP 1 [ID] FROM @TestData Y WHERE Y.[Product] = m>X m>.[Product])
,[SKU]= ( SELECT TOP 1 [SKU] FROM @TestData Y WHERE Y.[Product] = m>X m>.[Product])
,[PRODUCT]
FROM @TestData m>X m>
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What does the constant 0.0039215689 represent?
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0.0039215689 is approm>x m>imately equal to 1/255.
Seeing that this is OpenGL, performance is probably important. So it's probably safe to guess that this was done for performance reasons.
Multiplying by the reciprocal is faster than repeatedly divi...
Create an empty object in JavaScript with {} or new Object()?
...le.
For defining empty objects they're technically the same. The {} syntam>x m> is shorter, neater (less Java-ish), and allows you to instantly populate the object inline - like so:
var myObject = {
title: 'Frog',
url: '/img/picture.jpg',
width: 300,
height: 200
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Ternary operator is twice as slow as an if-else block?
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To answer this question, we'll em>x m>amine the assembly code produced by the m>X m>86 and m>X m>64 JITs for each of these cases.
m>X m>86, if/then
32: foreach (int i in array)
0000007c 33 D2 m>x m>or edm>x m>,edm>x m>
0000007e 83 7E 04 00 ...
cd into directory without having permission
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@user812954's answer was quite helpful, em>x m>cept I had to do this this in two steps:
sudo su
cd directory
Then, to em>x m>it out of "super user" mode, just type em>x m>it.
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How to add and get Header values in WebApi
... No. The headers.GetValues("somethingNotFound") throws an InvalidOperationEm>x m>ception.
– Aidanapword
Jun 9 '16 at 9:42
D...