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Return all enumerables with yield return at once; without looping through
I have the following function to get validation errors for a card. My question relates to dealing with GetErrors. Both methods have the same return type IEnumerable<ErrorInfo> .
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When to use enumerateObjectsUsingBlock vs. for
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Ultimately, use whichever pattern you want to use and comes more naturally in the context.
While for(... in ...) is quite convenient and syntactically brief, enumerateObjectsUsingBlock: has a number of features that may or may not prove interesting:
enumerateObjectsUsingBlock: will be as fas...
Extending an Object in Javascript
...n't affect `Person` prototype and its descendants
anakin.machineGreet() // error
Person.isPrototypeOf(Robot) // outputs true
Robot.isPrototypeOf(Skywalker) // outputs false
In TypeScript you would also need to extend the Person interface:
interface Robot extends Person {
machineGreet: Function...
Get button click inside UITableViewCell
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can you help me, i am getting error at this line: class MyTableViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, OptionButtonsDelegate //error: Redundant conformance of 'MyTableViewController' to protocol 'UITableViewDataSourc...
When to use .First and when to use .FirstOrDefault with LINQ?
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First()
Returns first element of a sequence.
It throw an error when There is no element in the result or source is null.
you should use it,If more than one element is expected and you want only first element.
FirstOrDefault()
Returns first element of a sequence, or a defa...
What is __pycache__?
...sn't get created, so there's no speedup next time the module is loaded. No error is raised.
– Petr Viktorin
Jul 12 '15 at 13:31
9
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Git / Bower Errors: Exit Code # 128 & Failed connect
...m installing bootstrap. Regardless of the package, I receive the following errors:
24 Answers
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Why does changing the sum order returns a different result?
...t of additions vs. 4047866666666667 for the second set of additions. That error is significant enough to show in the printout of the total.
In conclusion, be careful when performing mathematical operations on IEEE numbers. Some representations are inexact, and they become even more inexact when t...
How to find the port for MS SQL Server 2008?
... Configuration Manager
Method 2: Windows Event Viewer
Method 3: SQL Server Error Logs
Method 4: sys.dm_exec_connections DMV
Method 5: Reading registry using xp_instance_regread
Method 4: sys.dm_exec_connections DMV
I think this is almost the easiest way...
DMVs return server state that can be used...
Comma in C/C++ macro
...his is also a problem for square brackets and braces, even though those usually occur as balanced pairs.) You can enclose the macro argument in parentheses:
FOO((std::map<int, int>), map_var);
The problem is then that the parameter remains parenthesized inside the macro expansion, which pr...