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Perform .join on value in array of objects
If I have an array of strings, I can use the .join() method to get a single string, with each element separated by commas, like so:
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How are Python's Built In Dictionaries Implemented?
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Python hash table is just a contiguous block of memory (sort of like an array, so you can do an O(1) lookup by index).
Each slot in the table can store one and only one entry. This is important.
Each entry in the table is actually a combination of the three values: < hash, key, value >. T...
Why do we need argc while there is always a null at the end of argv?
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@BasileStarynkevitch Time of merely stepping through an array of pointer values one extra time until NULL, to get the count, is miniscule compared to time already spent generating the pointer array, and even more irrelevant compared to actually using each argument value in the pro...
C# LINQ find duplicates in List
...ow just a wonder, let's say that duplicated int are distributed into n int arrays, im using dictionary and for loop to understand which array contains a duplicate and remove it according to a logic of distribution, is there a fastest way (linq wondering) to achieve that result ? thank you in advance...
Selecting only first-level elements in jquery
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jQuery.extend(jQuery.expr[':'], {
topmost: function (e, index, match, array) {
for (var i = 0; i < array.length; i++) {
if (array[i] !== false && $(e).parents().index(array[i]) >= 0) {
return false;
}
}
return true;
}
});
Utilizing this, the sol...
Is there a query language for JSON?
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The built-in array.filter() method makes most of these so-called javascript query libraries obsolete
You can put as many conditions inside the delegate as you can imagine: simple comparison, startsWith, etc. I haven't tested but you coul...
Is there a JavaScript function that can pad a string to get to a determined length?
... method
If you are doing this repeatedly, for example to pad values in an array, and performance is a factor, the following approach can give you nearly a 100x advantage in speed (jsPerf) over other solution that are currently discussed on the inter webs. The basic idea is that you are providing th...
Return a `struct` from a function in C
...nk this feature was already common during the eighties or early nineties.
Arrays, however, can still be passed and returned only as pointers.
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Is there a foreach in MATLAB? If so, how does it behave if the underlying data changes?
...B supports Java objects, so you can do something like this:
A = java.util.ArrayList();
A.add(1);
A.add(2);
A.add(3);
A.add(4);
A.add(5);
itr = A.listIterator();
while itr.hasNext()
k = itr.next();
disp(k);
% modify data structure while iterating
itr.remove();
itr.add(k);
en...
What is the most elegant way to remove a path from the $PATH variable in Bash?
... the simplest solution i can devise:
#!/bin/bash
IFS=:
# convert it to an array
t=($PATH)
unset IFS
# perform any array operations to remove elements from the array
t=(${t[@]%%*usr*})
IFS=:
# output the new array
echo "${t[*]}"
The above example will remove any element in $PATH that contains "usr...