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What does the “===” operator do in Ruby? [duplicate]
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Just like with every other method in Ruby (or actually pretty much any object-oriented language),
a === b
means whatever the author of a's class wants it to mean.
However, if you don't want to confuse the heck out of your colleagues, the convention is that === is the cas...
Java: Check if enum contains a given string?
...u do not have to worry about adding additional enum values later, they are all checked.
Edit: If the enum is very large you could stick the values in a HashSet:
public static HashSet<String> getEnums() {
HashSet<String> values = new HashSet<String>();
for (Choice c : Choice...
How to run Rails console in the test environment and load test_helper.rb?
...other tests. I'd like to go to the console and run different Factory Girl calls to check out what's happening. For example, I'd like to go in there are do...
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How do I test a camera in the iPhone simulator?
...n send it through the pipelined to be treated like a normal photo. Essentially providing the feel of a very fast camera.
CGSize sz = UIDeviceOrientationIsPortrait([[UIDevice currentDevice] orientation]) ? CGSizeMake(2448, 3264) : CGSizeMake(3264, 2448);
UIGraphicsBeginImageContextWithOptions(sz, Y...
Find where python is installed (if it isn't default dir)
...isn't in it's default directory, there surely is a way of finding it's install location from here?
11 Answers
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How do you divide each element in a list by an int?
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The way you tried first is actually directly possible with numpy:
import numpy
myArray = numpy.array([10,20,30,40,50,60,70,80,90])
myInt = 10
newArray = myArray/myInt
If you do such operations with long lists and especially in any sort of scientific com...
The specified type member 'Date' is not supported in LINQ to Entities Exception
... It looks as if Convert.ToDateTime(rule.data).Date is causing the error.
Calling Date on a DateTime property also cannot be translated to SQL, so a workaround is to compare the .Year .Month and .Day properties which can be translated to LINQ since they are only integers.
var ruleDate = Convert.To...
Python division
...-100 and was having problems only to notice that even with no variables at all, this does not evaluate the way I would expect it to:
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How to hash some string with sha256 in Java?
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SHA-256 isn't an "encoding" - it's a one-way hash.
You'd basically convert the string into bytes (e.g. using text.getBytes(StandardCharsets.UTF_8)) and then hash the bytes. Note that the result of the hash would also be arbitrary binary data, and if you want to represent that in a strin...
What is the iPad user agent?
... This answer is incorrect. From iOS 13 there is now no mention of iPad at all.
– CpnCrunch
Dec 16 '19 at 18:51
See th...