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Why is “a” != “a” in C?
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What you are comparing are the two memory addresses for the different strings, which are stored in different locations. Doing so essentially looks like this:
if(0x00403064 == 0x002D316A) // Two memory locations
{
printf("Yes, equal");
}
Use the following code to compare two stri...
defaultdict of defaultdict?
...ns in our case the value of d[Key_doesnt_exist] will be defaultdict(int).
If you try to access a key from this last defaultdict i.e. d[Key_doesnt_exist][Key_doesnt_exist] it will return 0, which is the return value of the argument of the last defaultdict i.e. int().
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How do I make class methods / properties in Swift?
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In Swift 2.0+, you don't need the class keyword before a function or a computed type property.
– Govind Rai
Jun 24 '16 at 20:31
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What is data oriented design?
...you might do operations that affects only part of a balls properties. E.g. if you combine the colors of all the balls in various ways, then you want your cache to only contain color information. However when all ball properties are stored in one unit you will pull in all the other properties of a ba...
iphone ios running in separate thread
...tch_get_main_queue(), ^{
// Add code here to update the UI/send notifications based on the
// results of the background processing
});
});
If you haven't done so already, check out the videos from WWDC 2010 on libdispatch/GCD/blocks.
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JavaScript - Replace all commas in a string [duplicate]
...expressions use special characters that need to be escaped. As an example, if you need to escape a dot (.) character, you should use /\./ literal, as in the regex syntax a dot matches any single character (except line terminators).
var myStr = 'this.is.a.test';
var newStr = myStr.replace(/\./g...
How to write PNG image to string with the PIL?
...:
import io
with io.BytesIO() as output:
image.save(output, format="GIF")
contents = output.getvalue()
You have to explicitly specify the output format with the format parameter, otherwise PIL will raise an error when trying to automatically detect it.
If you loaded the image from a fil...
How do you git show untracked files that do not exist in .gitignore
... can explicitly list what is being tracked and untracked as follows to see if Git is seeing and honoring your .gitignore. If you post your .gitignore contents, git status output, and dir or ls we can better assist you.
List ignored files
$ git ls-files . --ignored --exclude-standard --others
Lis...
Getting “bytes.Buffer does not implement io.Writer” error message
...value or pointer receivers. I think this is a really peculiar twist to Go. If the interface is implemented using value receivers either way is OK but if the interface is implemented using pointer receivers you have to pass a pointer to the value if you intend to use the interface. It makes sense sin...
How does RegexOptions.Compiled work?
...mark a regular expression as one to be compiled? How does this compare/is different from a cached regular expression?
5 Ans...