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When should we use Observer and Observable?
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You have a concrete example of a Student and a MessageBoard. The Student registers by adding itself to the list of Observers that want to be notified when a new Message is posted to the MessageBoard. When a Message is added to the MessageBoard, it iterates over it...
how to change any data type into a string in python
...error like ordinal not in range(128). This was the case for me while I was converting list of string in language other than English
I resolved it by using unicode(object)
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How and why does 'a'['toUpperCase']() in JavaScript work?
...rCase() is a method of String.prototype
'a' is a primitive value, but gets converted into its Object representation
We have two possible notations to access object properties/methods, dot and bracket notation
So
'a'['toUpperCase'];
is the access via bracket notation on the property toUpperCase,...
Programmatically Request Access to Contacts
...lling user to change privacy setting in settings app
}
Update For iOS 9 and later:
From Apple website :
Important
The Address Book UI framework is deprecated in iOS 9. Use the APIs defined in the ContactsUI framework instead. To learn more, see ContactsUI
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Are default enum values in C the same for all compilers?
...as shown below, do all C compilers set the default values as x=0 , y=1 , and z=2 on both Linux and Windows systems?
4 A...
What is the proper #include for the function 'sleep()'?
I am using the Big Nerd Ranch book Objective-C Programming, and it starts out by having us write in C in the first few chapters. In one of my programs it has me create, I use the sleep function. In the book it told me to put #include <stdlib.h> under the #include <stdio.h> part. This...
Rails - link_to helper with data-* attribute [duplicate]
...oo-bar' => 'that' }
Update: In Rails 4, underscores are automatically converted to dashes, so you can do this:
:data => { :foo_bar => 'that' }
Alternatively you can just write it directly:
= link_to body, url, :'data-foo' => 'bar', :'data-this' => 'that'
Update 2: As pointed o...
php create object without class [duplicate]
...ay into a nested stdClass object. If you use (object) $array it will only convert the first layer into an object, everything nested inside that will remain an array.
– David Routen
Mar 2 '18 at 20:29
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Change default primary key in Eloquent
... the other answers. $primarykey should be $primaryKey (uppercase letter K) and won't work otherwise.
– Jeremy Harris
Feb 7 '14 at 20:07
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Python division
...hat always pops in my head when I am doing arithmetic operations (should I convert to float and which number), an example from that aspect is presented:
>>> a = 1/2/3/4/5/4/3
>>> a
0
When we divide integers, not surprisingly it gets lower rounded.
>>> a = 1/2/3/4/5/4/f...