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@OneToMany List vs Set difference
Is there any difference if I use
2 Answers
2
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Position an element relative to its container
... it is removed from normal flow and offset by whatever values you have specified (top, right, bottom, left). It's important to note that because it's removed from flow, other elements around it will not shift with it (use negative margins instead if you want this behaviour).
However, you're most li...
How can I detect if this dictionary key exists in C#?
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You can use ContainsKey:
if (dict.ContainsKey(key)) { ... }
or TryGetValue:
dict.TryGetValue(key, out value);
Update: according to a comment the actual class here is not an IDictionary but a PhysicalAddressDictionary, so the methods are Contai...
How to Create Deterministic Guids
...d value. This value needed to be consistent between file upgrades. So even if everything else in the file changes, the guid value for the attribute should remain the same.
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Principal component analysis in Python
...o 90 %, 95 % ...
p.npc: number of principal components,
e.g. 2 if the top 2 eigenvalues are >= `fraction` of the total.
It's ok to change this; methods use the current value.
Methods:
The methods of class PCA transform vectors or arrays of e.g.
20 variables, 2 princip...
How to check 'undefined' value in jQuery
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JQuery library was developed specifically to simplify and to unify certain JavaScript functionality.
However if you need to check a variable against undefined value, there is no need to invent any special method, since JavaScript has a typeof operator, whic...
Have a fixed position div that needs to scroll if content overflows
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If you set "overflow-y" to auto, the scroll bar will disappear when the content is within the viewport. In other words, if it doesn't overflow, there will be no scroll bar and when it does overflow, there will be a scrollbar....
Java Map equivalent in C#
...An efficient way to test/get values is TryGetValue (thanx to Earwicker):
if (otherExample.TryGetValue("key", out value))
{
otherExample["key"] = value + 1;
}
With this method you can fast and exception-less get values (if present).
Resources:
Dictionary-Keys
Try Get Value
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IOS: create a UIImage or UIImageView with rounded corners
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ok it work for an UIImageView but if I put inside this UIImageView an UIImage it don't work, how can I solve?
– cyclingIsBetter
Oct 9 '11 at 20:01
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How can I see the request headers made by curl when sending a request to the server?
...eful to me as it simply duplicated the headers that -v already displayed. If you want them unprefixed for automated machine consumption, then maybe it would be better in that case, but I only wanted to glimpse at what a problem was in more detail.
– Pysis
Nov ...