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How to copy a dictionary and only edit the copy
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Python never implicitly copies objects. When you set dict2 = dict1, you are making them refer to the same exact dict object, so when you mutate it, all references to it keep referring to the object in its current state.
If you want to copy the dict (which is rare), you hav...
Understanding “randomness”
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Neither is 'more random'.
rand() generates a predictable set of numbers based on a psuedo-random seed (usually based on the current time, which is always changing). Multiplying two consecutive numbers in the sequence generates a different, but equally predictable, sequence of numbe...
How can one close HTML tags in Vim quickly?
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Check this out..
closetag.vim
Functions and mappings to close open HTML/XML tags
https://www.vim.org/scripts/script.php?script_id=13
I use something similar.
share
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git revert back to certain commit [duplicate]
how do i revert all my files on my local copy back to a certain commit?
3 Answers
3
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How to perform Callbacks in Objective-C
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Header File:
@interface MyClass : NSObject {
id delegate;
}
- (void)setDelegate:(id)delegate;
- (void)doSomething;
@end
@interface NSObject(MyDelegateMethods)
- (void)myClassWillDoSomething:(MyClass *)myClass;
- (void)myClassDidDoSomething:(MyClass *)myClass;
@end
Implementation (.m) Fil...
Formatting NSDate into particular styles for both year, month, day, and hour, minute, seconds
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NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"yyyy-MM-dd"];
NSDateFormatter *timeFormat = [[NSDateFormatter alloc] init];
[timeFormat setDateFormat:@"HH:mm:ss"];
NSDate *now = [[NSDate alloc] init];
NSString *theDate = [dateFormat stringFromDate:now];
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Moving UITabBarItem Image down?
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Try adjusting tabBarItem's imageInsets (for moving the icon image) and setting the controllers title to nil (so no title is displayed). Put something like this to -init or -viewDidLoad method in view controller:
Objective-C
self.tabBarItem.imageInsets = UIE...
CSS: background image on background color
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Based on MDN Web Docs you can set multiple background using shorthand background property or individual properties except for background-color. In your case, you can do a trick using linear-gradient like this:
background-image: url('images/checked.png'),...
Determine if a sequence contains all elements of another sequence using Linq [duplicate]
Given two sets of values:
4 Answers
4
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How to set HTTP headers (for cache-control)?
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You can set the headers in PHP by using:
<?php
//set headers to NOT cache a page
header("Cache-Control: no-cache, must-revalidate"); //HTTP 1.1
header("Pragma: no-cache"); //HTTP 1.0
header("Expires: Sat, 26 Jul 1997 05:0...