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Why can't variable names start with numbers?
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It's a convention now, but it started out as a technical requirement.
In the old days, parsers of languages such as FORTRAN or BASIC did not require the uses of spaces. So, basically, the following are identical:
10 V1=100
20 PRINT V1
and
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PostgreSQL: Drop PostgreSQL database through command line [closed]
...elect * from pg_stat_activity;" say? Are the other users besides yourself now connected? If so, you might have to edit your pg_hba.conf file to reject connections from other users, or shut down whatever app is accessing the pg database to be able to drop it. I have this problem on occasion in pro...
JavaScript: How do I print a message to the error console?
... +1. And for the benefit of anyone arriving at this question now, it's worth pointing out that since the question was answered, all browsers have now implemented the console object, so console.log() etc should work in all browsers, including IE. However, in all cases, you need to have ...
How to develop Desktop Apps using HTML/CSS/JavaScript? [closed]
... Backet.io of Adobe, AppJS, etc. It is so unstable and only is a prototype now for get a MVP, is writed in Python for test concept but will be translate code to C++/C with QT5 (now use QT4) and when be in C++/C start translation for mobil support.
– user2006656
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Object.watch() for all browsers?
Please note that Object.Watch and Object.Observe are both deprecated now (as of Jun 2018).
8 Answers
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Using ZXing to create an Android barcode scanning app [duplicate]
...lementing the code until I found some website (I can't find it again right now) that explained that you need to include the package name in the name of the intent.putExtra.
It would pull up the application, but it wouldn't recognize any barcodes, and when I changed it from.
intent.putExtra("SCAN_M...
QuotaExceededError: Dom exception 22: An attempt was made to add something to storage that exceeded
...de to work.
UPDATE: This has been fixed in Safari 11, so the behaviour is now aligned with other browsers.
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How do I make an attributed string using Swift?
...y.underlineStyle] = NSUnderlineStyle.double.rawValue
Attributed Strings
Now that you understand attributes, you can make attributed strings.
Initialization
There are a few ways to create attributed strings. If you just need a read-only string you can use NSAttributedString. Here are some ways t...
numpy: most efficient frequency counts for unique values in an array
...y 1.9, the easiest and fastest method is to simply use numpy.unique, which now has a return_counts keyword argument:
import numpy as np
x = np.array([1,1,1,2,2,2,5,25,1,1])
unique, counts = np.unique(x, return_counts=True)
print np.asarray((unique, counts)).T
Which gives:
[[ 1 5]
[ 2 3]
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Eclipse copy/paste entire line keyboard shortcut
Anyone know the keyboard shortcut to copy/paste a line into a new line in Eclipse , without having to highlight the entire line?
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