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Are there strongly-typed collections in Objective-C?
...will generate compiler warnings if there is a type mismatch.
NSArray<NSString*>* arr = @[@"str"];
NSString* string = [arr objectAtIndex:0];
NSNumber* number = [arr objectAtIndex:0]; // Warning: Incompatible pointer types initializing 'NSNumber *' with an expression of type 'NSString *'
And...
Equation (expression) parser with precedence?
...t precedence you need to think recursively, for example, using your sample string,
1+11*5
to do this manually, you would have to read the 1, then see the plus and start a whole new recursive parse "session" starting with 11... and make sure to parse the 11 * 5 into its own factor, yielding a par...
Get querystring from URL using jQuery [duplicate]
...
To retrieve the entire querystring from the current URL, beginning with the ? character, you can use
location.search
https://developer.mozilla.org/en-US/docs/DOM/window.location
Example:
// URL = https://example.com?a=a%20a&b=b123
console.log(l...
Google Maps API - Get Coordinates of address
...d my problem:Geocoding.Google 4.0.0.
Install it so not necessary to write extra classes etc.
https://www.nuget.org/packages/Geocoding.Google/
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How do I migrate a model out of one django app and into a new one?
...opefully for create_kittycat you only need to change the following
# 4 strings to go forward cleanly... backwards will need a bit more work.
old_app = 'common'
old_model = 'cat'
new_app = 'specific'
new_model = 'kittycat'
# You may also wish to update the ContentType.name,
...
Rails :include vs. :joins
...ment belongs_to a User.
The User model has the following attributes: Name(string), Age(integer). The Comment model has the following attributes:Content, user_id. For a comment a user_id can be null.
Joins:
:joins performs a inner join between two tables. Thus
Comment.joins(:user)
#=> <A...
What is so bad about singletons? [closed]
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I disagree with you. Since comments are allowed only 600 chars, I have written a Blog Post to comment on this, please see the link below. jorudolph.wordpress.com/2009/11/22/singleton-considerations
– Johannes Rudolph
Nov 22 '09 at 14:35
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Why {} + {} is NaN only on the client side? Why not in Node.js?
While [] + [] is an empty string, [] + {} is "[object Object]" , and {} + [] is 0 . Why is {} + {} NaN?
1 Answer
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Class vs. static method in JavaScript
...: primitive values—which include undefined, null, booleans, numbers, and strings—aren't technically objects because they're low-level language implementations. Booleans, numbers, and strings still interact with the prototype chain as though they were objects, so for the purposes of this answer, ...
JavaScript: What are .extend and .prototype used for?
...ethods to an object's prototype (you see this a lot in libraries to add to String, Date, Math, or even Function) those methods are added to every new instance of that object.
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