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How can I check for “undefined” in JavaScript? [duplicate]
...terested in finding out whether a variable has been declared regardless of its value, then using the in operator is the safest way to go. Consider this example:
// global scope
var theFu; // theFu has been declared, but its value is undefined
typeof theFu; // "undefined"
But this may not be the i...
TypeError: 'str' does not support the buffer interface
...Python3x then string is not the same type as for Python 2.x, you must cast it to bytes (encode it).
plaintext = input("Please enter the text you want to compress")
filename = input("Please enter the desired filename")
with gzip.open(filename + ".gz", "wb") as outfile:
outfile.write(bytes(plaint...
How to redirect all HTTP requests to HTTPS
I'm trying to redirect all insecure HTTP requests on my site (e.g. http://www.example.com ) to HTTPS ( https://www.example.com ). I'm using PHP btw. Can I do this in .htaccess?
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FFMPEG (libx264) “height not divisible by 2”
...ons so this filter will:
Divide the original height and width by 2
Round it up to the nearest pixel
Multiply it by 2 again, thus making it an even number
Add black padding pixels up to this number
You can change the color of the padding by adding filter parameter :color=white. See the documentat...
Parse v. TryParse
...
Parse throws an exception if it cannot parse the value, whereas TryParse returns a bool indicating whether it succeeded.
TryParse does not just try/catch internally - the whole point of it is that it is implemented without exceptions so that it is fast....
LIMIT 10..20 in SQL Server
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The LIMIT clause is not part of standard SQL. It's supported as a vendor extension to SQL by MySQL, PostgreSQL, and SQLite.
Other brands of database may have similar features (e.g. TOP in Microsoft SQL Server), but these don't a...
How do I convert a String object into a Hash object?
... by calling Hash#inspect can be turned back into a hash by calling eval on it. However, this requires the same to be true of all of the objects in the hash.
If I start with the hash {:a => Object.new}, then its string representation is "{:a=>#<Object:0x7f66b65cf4d0>}", and I can't use e...
Echo a blank (empty) line to the console from a Windows batch file [duplicate]
...etter. You can find my original (simplistic and misguided) answer in the edit history.
If Microsoft had the intent of providing a means of outputting a blank line from cmd.exe, Microsoft surely would have documented such a simple operation. It is this omission that motivated me to ask this question...
HTML5 check if audio is playing?
...lem) { return !audelem.paused; }
The Audio tag has a paused property. If it is not paused, then it's playing.
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Git SSH error: “Connect to host: Bad file number”
I followed the git guide but I have this strange issue when trying to connect to github:
19 Answers
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