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When should we use mutex and when should we use semaphore
...a mutex when you (thread) want to execute code that should not be executed by any other thread at the same time. Mutex 'down' happens in one thread and mutex 'up' must happen in the same thread later on.
e.g.: If you are deleting a node from a global linked list, you do not want another thread to mu...
Accessing dict_keys element by index in Python3
I'm trying to access a dict_key's element by its index:
6 Answers
6
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Select multiple columns in data.table by their numeric indices
...ta.table)
dt <- data.table(a = 1, b = 2, c = 3)
# select single column by index
dt[, 2]
# b
# 1: 2
# select multiple columns by index
dt[, 2:3]
# b c
# 1: 2 3
# select single column by name
dt[, "a"]
# a
# 1: 1
# select multiple columns by name
dt[, c("a", "b")]
# a b
# 1: 1 2
...
How to submit a form with JavaScript by clicking a link?
...id">submit</button>
</form>
var form = document.getElementById("form-id");
document.getElementById("your-id").addEventListener("click", function () {
form.submit();
});
Enclose the latter JavaScript code by an DOMContentLoaded event (choose only load for backward compatiblity) ...
Difference between thread's context class loader and normal classloader
... be created from a class in ClassLoaderC and then passed to a thread owned by ClassLoaderD. In this case the object needs to use Thread.currentThread().getContextClassLoader() directly if it wants to load resources that are not available on its own classloader.
...
Turning off “created by” stamp when generating files in IntelliJ
... Code Templates area of the settings dialog. In Idea 15+ you can get there by typing ctrl+shift+A on windows or cmd+shift+A on osx and then typing Include Templates in the popup action search dialog. There should be a tab called Includes on which you will find the Java and ActionScript file types, a...
Split comma-separated strings in a column into separate rows
... using the microbenchmark package (see code below).
The sample data given by the OP consists only of 20 rows. To create larger data frames, these 20 rows are simply repeated 1, 10, 100, 1000, 10000, and 100000 times which give problem sizes of up to 2 million rows.
Benchmark results
The benchm...
How to show disable HTML select option in by default?
... You don't need to put the true or disabled values. you can get by doing <option selected disabled>Choose Tagging</option>
– Sam Eaton
Feb 17 '16 at 3:37
19
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How to set a selected option of a dropdown list control using angular JS
...same issue I thought of sharing how I got the solution.
You can use track by attribute in your ng-options.
Assume that you have:
variants:[{'id':0, name:'set of 6 traits'}, {'id':1, name:'5 complete sets'}]
You can mention your ng-options as:
ng-options="v.name for v in variants track by v.id...
Javascript sort array by two fields
So the above code sorts the array by gsize - smallest to largest. It works good.
But if the gsize is the same I would like it to then sort by glow.
...