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What is the X-REQUEST-ID http header?
... is generated (randomly) by the client it does not contain any sensitive information, and should thus not violate the user's privacy. As a unique ID is created per request it does also not help with tracking users.
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.Contains() on a list of custom class objects
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You need to implement IEquatable or override Equals() and GetHashCode()
For example:
public class CartProduct : IEquatable<CartProduct>
{
public Int32 ID;
public String Name;
public Int32 Number;
public Decimal CurrentPrice;
public CartProduct(Int32 ID, String Name, In...
How do I join two SQLite tables in my Android application?
...d belongs to which table, and what if both tables had the same column name for some column? or if there are multiple items for the second table?
– android developer
Jan 10 '15 at 23:26
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Find the index of a dict within a list, by matching the dict's value
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tom_index = next((index for (index, d) in enumerate(lst) if d["name"] == "Tom"), None)
# 1
If you need to fetch repeatedly from name, you should index them by name (using a dictionary), this way get operations would be O(1) time. An idea:
def bui...
Check whether an input string contains a number in javascript
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You can do this using javascript. No need for Jquery or Regex
function isNumeric(n) {
return !isNaN(parseFloat(n)) && isFinite(n);
}
While implementing
var val = $('yourinputelement').val();
if(isNumeric(val)) { alert('number'); }
else { alert('not num...
“Insert if not exists” statement in SQLite
...rs_id , lessoninfo_id ) in table bookmarks , only if both do not exist before in a row.
4 Answers
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Django queries - id vs pk
...lash with the id() function (everywhere except variable names). The reason for this is that pk is a property which is 7 times slower than id since it takes time looking up pk attribute name in meta.
%timeit obj.id
46 ns ± 0.187 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)
%timeit...
What is the “owning side” in an ORM mapping?
... the case of objects. In databases we only have unidirectional relations - foreign keys.
What is the reason for the name 'owning side'?
The owning side of the relation tracked by Hibernate is the side of the relation that owns the foreign key in the database.
What is the problem that the notion ...
In Flux architecture, how do you manage Store lifecycle?
I'm reading about Flux but the example Todo app is too simplistic for me to understand some key points.
3 Answers
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How can I update window.location.hash without jumping the document?
... @DavidCook - We could also use history.replaceState (which, for hash changes, might make more sense) to avoid the need for a popstate event listener.
– Jack
Sep 6 '14 at 0:38
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