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JavaScript for…in vs for
...iginally:
for (var name in obj) {
if (Object.prototype.hasOwnProperty.call(obj, name)) {
// DO STUFF
}
}
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Why is it slower to iterate over a small string than a small list?
... 3
#>>> 21 GET_ITER
#>>> 22 CALL_FUNCTION 1 (1 positional, 0 keyword pair)
#>>> 25 POP_TOP
#>>> 26 LOAD_CONST 0 (None)
#>>> 29 RETURN_VALUE
def string_iterate():...
Saving and Reading Bitmaps/Images from Internal memory in Android
...
Came across this question today and this is how I do it.
Just call this function with the required parameters
public void saveImage(Context context, Bitmap bitmap, String name, String extension){
name = name + "." + extension;
FileOutputStream fileOutputStream;
try {
...
Postgresql GROUP_CONCAT equivalent?
I have a table and I'd like to pull one row per id with field values concatenated.
7 Answers
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JSON.net: how to deserialize without using the default constructor?
...e [JsonConstructor] attribute to the constructor that you want Json.Net to call.
[JsonConstructor]
public Result(int? code, string format, Dictionary<string, string> details = null)
{
...
}
It is important that the constructor parameter names match the corresponding property names of th...
PHP namespaces and “use”
...
So if i create another file called bootstrap.php and place an autoloader inside along with $circle = new Circle(); It includes the Circle.php but I am getting an error: Fatal error: Class 'Shape' not found in .../Circle.php on line 6. It appears to load...
Is it possible to GROUP BY multiple columns using MySQL?
...would change the ascending order of col2 returning. 1,1|2,2|1,3 Demo: sqlfiddle.com/#!9/d5f69/1 Note that row id: 2 is returned in both cases for 2,2 despite inverting the columns.
– Will B.
May 24 '16 at 17:35
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Why covariance and contravariance do not support value type
...
Basically, variance applies when the CLR can ensure that it doesn't need to make any representational change to the values. References all look the same - so you can use an IEnumerable<string> as an IEnumerable<object>...
Linq to Entities - SQL “IN” clause
...nstead of assigning the variable, I could do the foreach over an anonymous call like this:
foreach(User u in users.Where(u => new [] { "Admin", "User", "Limited" }.Contains(u.User_Rights)))
{
//Do stuff on each selected user;
}
Syntactically this looks more complex, and you have to underst...
Show an image preview before upload
...bute of an image tag to a data URL:
The html code:
<input type="file" id="files" />
<img id="image" />
The JavaScript code:
document.getElementById("files").onchange = function () {
var reader = new FileReader();
reader.onload = function (e) {
// get loaded data and...