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String concatenation in Ruby
...gs you often can gain performance by appending the strings to an array and then at the end put the string together atomically. Then << could be useful?
– PEZ
Dec 18 '08 at 13:12
...
When to use Amazon Cloudfront or S3
...s that CloudFront allows you to mirror the site on your server. Cloudfront then caches the files such as images, mp3 or video using its content delivery network.
This saves you having to duplicate your assets as you would when you use Amazon S3.
However, after a file expires, CloudFront will fetc...
How many characters can UTF-8 encode?
...ce; the number of consecutive high bits set indicates the number of bytes, then a 0, and the remaining bits contribute to the value. For the other bytes, the highest two bits will be 1 and 0 and the remaining 6 bits are for the value.
So a four byte sequence would begin with 11110... (and ... = th...
Open the start page in Visual Studio after closing a project?
...VS2013.
Right click on the toolbar and choose Customize... at the bottom then go to Commands
Switch to Toolbar/Standard and then click the Add Command button an locate the View group on the left
Finally locate the Start Page item and click OK.
...
Waiting on a list of Future
...s same issue which i mentioned in my post.If forth future throws exception then the code will still wait for future 1,2,3 to complete. or will completionSerice.take) will return the future which completes first?
– user93796
Oct 13 '13 at 18:07
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Getting the first character of a string with $str[0]
... that the result is different when applied to an empty string. If $s = "" then $s[] === "", but substr($s, 0, 1) === false.
– xtempore
Jul 6 '14 at 2:02
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Invert “if” statement to reduce nesting
...g performance: both versions should be equivalent (if not at the IL level, then certainly after the jitter is through with the code) in every language. Theoretically this depends on the compiler, but practically any widely used compiler of today is capable of handling much more advanced cases of cod...
Create a tag in a GitHub repository
...n Create a new release or Draft a new release,
Fill out the form fields, then click Publish release at the bottom,
After you create your tag on GitHub, you might want to fetch it into your local repository too:
git fetch
Now next time, you may want to create one more tag within the same rel...
How to avoid Python/Pandas creating an index in a saved csv?
...he data using it.
So, to save the indexed data, first set their index and then save the DataFrame:
df.set_index('timestamp')
df.to_csv('processed.csv')
Afterwards, you can either read the data with the index:
pd.read_csv('processed.csv', index_col='timestamp')
or read the data, and then set t...
Setting PayPal return URL and making it auto return?
...fy you when payments/refunds/etc. go through. That IPN handler page would then be the correct place to update the database to mark orders as having been paid.
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