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Insert an element at a specific index in a list and return the updated list
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l.insert(index, obj) doesn't actually return anything. It just updates the list.
As ATO said, you can do b = a[:index] + [obj] + a[index:].
However, another way is:
a = [1, 2, 4]
b = a[:]
b.insert(2, 3)
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Entity Framework code first unique column
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In Entity Framework 6.1+ you can use this attribute on your model:
[Index(IsUnique=true)]
You can find it in this namespace:
using System.ComponentModel.DataAnnotations.Schema;
If your model field is a string, make sure it is not set to nvarchar(MAX) in SQL Server or you will see this er...
Find index of last occurrence of a substring in a string
I want to find the position (or index) of the last occurrence of a certain substring in given input string str .
9 Answers...
Using ThreadPool.QueueUserWorkItem in ASP.NET in a high traffic scenario
... being that you should leave the ThreadPool to deal with ASP.NET related requests.
11 Answers
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Angular ng-repeat Error “Duplicates in a repeater are not allowed.”
...w in [1,1,1]">
However, changing the above code slightly to define an index to determine uniqueness as below will get it working again.
// This will work
<div ng-repeat="row in [1,1,1] track by $index">
Official docs are here: https://docs.angularjs.org/error/ngRepeat/dupes
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How to remove element from array in forEach loop?
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}
var review = ['a', 'b', 'c', 'b', 'a'];
review.forEach(function(item, index, object) {
if (item === 'a') {
object.splice(index, 1);
}
});
log(review);
<pre id="out"></pre>
Which works fine for simple case where you do not have 2 of the same values as adjacent array i...
Application Error - The connection to the server was unsuccessful. (file:///android_asset/www/index.
...r situation.
The problem might be solved by adding a timeout to call your index.html
ie you need to add super.setIntegerProperty("loadUrlTimeoutValue", 70000); in your activity.java file ( inside src/com/yourProj/--/youractivity.java)
above this line: super.loadUrl("file:///android_asset/www/inde...
SQL Server - When to use Clustered vs non-Clustered Index?
I know primary differences between clustered and non clustered indexes and have an understanding of how they actually work. I understand how clustered and non-clustered indexes improve read performance. But one thing I am not sure is that what would be the reasons where I would choose one over the o...
php - get numeric index of associative array
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The indexes given by "array_keys" will not necessarily match the index of the original array. For example, if you have altered the array by using "unset" or a number of other functions, there will be a gap left in the index of th...
Can I have multiple primary keys in a single table?
... username OR a userid, without needing both. I guess RB's answer of unique indexes would do the trick there.
– Burrito
Dec 18 '17 at 16:30
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