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Why can tuples contain mutable items?
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One reason is that there is no general way in Python to convert a mutable type into an immutable one (see the rejected PEP 351, and the linked discussion for why it was rejected). Thus, it would be impossible to put various types of objects in tuples if it had this restriction, in...
Merge 2 arrays of objects
...{ name: "age", value: "28" },
{ name: "childs", value: '5' }
]
// Convert to key value dictionary or object
const convertToKeyValueDict = arrayObj => {
const val = {}
arrayObj.forEach(ob => {
val[ob.name] = ob.value
})
return val
}
// update or merge ...
Why doesn't .NET/C# optimize for tail-call recursion?
...l generate the relevant opcodes (though for a simple recursion it may just convert the whole thing into a while loop directly). C#'s csc does not.
See this blog post for some details (quite possibly now out of date given recent JIT changes). Note that the CLR changes for 4.0 the x86, x64 and ia64 w...
How to include a font .ttf using CSS?
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I also had trouble with Font Squirrel. success with font-converter.net
– Peter Hayman
Jun 21 at 5:24
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Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_
...red a very weird effect: Changing the loop variable from unsigned to uint64_t made the performance drop by 50% on my PC.
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PostgreSQL: Can you create an index in the CREATE TABLE definition?
...TE TABLE syntax. PostgreSQL does however create an index for unique constraints and primary keys by default, as described in this note:
PostgreSQL automatically creates an index for each unique constraint and primary key constraint to enforce uniqueness.
Other than that, if you want a non-uniq...
How to get the list of all printers in computer
I need to get the list of all printers that connect to computer?
6 Answers
6
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Python string.join(list) on object array rather than string array
...on thing in the universe: join("sep", list) - and all elements of list get converted to their string representations. I've been really struggling to find a solution in python.
– Jason
Feb 23 '18 at 13:12
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Implementing two interfaces in a class with same method. Which interface method is overridden?
Two interfaces with same method names and signatures. But implemented by a single class then how the compiler will identify the which method is for which interface?
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Entity Framework code first unique column
...odel will look like this now in EF CF 6.1+:
public class User
{
public int UserId{get;set;}
[StringLength(450)]
[Index(IsUnique=true)]
public string UserName{get;set;}
}
Update:
if you use Fluent:
public class UserMap : EntityTypeConfiguration<User>
{
public UserMap()
...