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jQuery map vs. each
...back arguments in the map function so be careful.
map(arr, function(elem, index) {});
// versus
each(arr, function(index, elem) {});
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How to find first element of array matching a boolean condition in JavaScript?
...eturn whether the condition was met once, not by which element (or at what index) it was met. So we have to amend it a little:
function find(arr, test, ctx) {
var result = null;
arr.some(function(el, i) {
return test.call(ctx, el, i, arr) ? ((result = el), true) : false;
});
...
Checking if a string array contains a value, and if so, getting its position
...
You could use the Array.IndexOf method:
string[] stringArray = { "text1", "text2", "text3", "text4" };
string value = "text3";
int pos = Array.IndexOf(stringArray, value);
if (pos > -1)
{
// the array contains the string and the pos variable...
Why use ICollection and not IEnumerable or List on many-many/one-many relationships?
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Lists are defined more by their indexers than by the ability to sort them (having an integer indexer makes it easy to sort something, but it's not a requirement).
– phoog
Apr 11 '12 at 20:22
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Strange SQLAlchemy error message: TypeError: 'dict' object does not support indexing
I am using hand crafted SQL to fetch data from a PG database, using SqlAlchemy. I am trying a query which contains the SQL like operator '%' and that seems to throw SqlAlcjhemy through a loop:
...
Can we write our own iterator in Java?
...Type> it = new Iterator<Type>() {
private int currentIndex = 0;
@Override
public boolean hasNext() {
return currentIndex < currentSize && arrayList[currentIndex] != null;
}
@Override
public...
Java: how can I split an ArrayList in multiple small ArrayLists?
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You can use subList(int fromIndex, int toIndex) to get a view of a portion of the original list.
From the API:
Returns a view of the portion of this list between the specified fromIndex, inclusive, and toIndex, exclusive. (If fromIndex and toIndex ...
How to handle click event in Button Column in Datagridview?
...here and even provided by the documentation at MSDN to hardcode the column index or column name in order to determine if a button was clicked. The click event registers for the entire grid, so somehow you need to determine that a button was clicked, but you should not do so by assuming that your bu...
Which data type for latitude and longitude?
...map, it is (x, y).
To find closest point you need first to create spatial index:
create index on your_table using gist (geog);
and then request, say, 5 closest to a given point:
select *
from your_table
order by geog <-> 'SRID=4326;POINT(lon lat)'
limit 5;
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Remove Primary Key in MySQL
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Without an index, maintaining an autoincrement column becomes too expensive, that's why MySQL requires an autoincrement column to be a leftmost part of an index.
You should remove the autoincrement property before dropping the key:
AL...