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NameError: name 'self' is not defined
...ot refer each other.
It's a common pattern to default an argument to None and add a test for that in code:
def p(self, b=None):
if b is None:
b = self.a
print b
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How do you trigger a block after a delay, like -performSelector:withObject:afterDelay:?
...that are not marked as being in __block storage are retained by the block, and get released by the block when it is destroyed (when its retain count goes to 0). Here's the documentation on that: developer.apple.com/library/mac/documentation/Cocoa/Conceptual/…
– Ryan
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C++ inheritance - inaccessible base?
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The default inheritance type of a class in C++ is private, so any public and protected members from the base class are limited to private. struct inheritance on the other hand is public by default.
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Calling a class function inside of __init__
I'm writing some code that takes a filename, opens the file, and parses out some data. I'd like to do this in a class. The following code works:
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How to create duplicate allowed attributes
... AttributeUsage attribute onto your Attribute class (yep, that's mouthful) and set AllowMultiple to true:
[AttributeUsage(AttributeTargets.Method, AllowMultiple = true)]
public sealed class MyCustomAttribute: Attribute
sha...
MySql - Way to update portion of a string?
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Use the LIKE operator to find the rows that you care about and update them using the REPLACE function.
For example:
UPDATE table_name SET field_name = REPLACE(field_name,'search','replace') WHERE field_name LIKE '%some_value%'
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Parse XML using JavaScript [duplicate]
...tion, asked 20 minutes before this one, that you are trying to parse (read and convert) the XML found through using GeoNames' FindNearestAddress.
If your XML is in a string variable called txt and looks like this:
<address>
<street>Roble Ave</street>
<mtfcc>S1400</mt...
Writing handler for UIAlertAction
I'm presenting a UIAlertView to the user and I can't figure out how to write the handler. This is my attempt:
9 Answers
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How to check if multiple array keys exists
...x the only issue is that if $keys contains one element that is not in $arr and another that is in it, !array_diff_key returns empty => false (3v4l example)...
– CPHPython
Aug 17 '18 at 10:10
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How to create a JavaScript callback for knowing when an image is loaded?
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.complete + callback
This is a standards compliant method without extra dependencies, and waits no longer than necessary:
var img = document.querySelector('img')
function loaded() {
alert('loaded')
}
if (img.complete) {
loaded()
} else {
img.addEven...