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How to change a command line argument in Bash?
...the function's own arguments hide them. You can, however, store them in an array and operate on that.
– thkala
May 6 '15 at 23:11
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Pair/tuple data type in Go
...ilar that handles arbitrary types using interface{}. (I might have used an array rather than a struct to make it indexable like a tuple, but the key idea is the interface{} type)
My other answer shows how you can do something similar that avoids creating a type using anonymous structs.
These techn...
NSUserDefaults removeObjectForKey vs. setObject:nil
... to nil removed the key entry from NSUserDefaults standardUserDefaults.
NSArray *keys = [[[NSUserDefaults standardUserDefaults] dictionaryRepresentation] allKeys] copy];
for(NSString *key in keys) {
NSLog(@"Key Name: %@", key);
}
[keys release];
or simply dump the key/value dictionary o...
Performing regex Queries with pymongo
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If you need to match agains an array using $in then $regex would not work for you. bson.regex.Regex will do the trick!
– odedfos
Jul 4 '18 at 13:27
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Java 8: performance of Streams vs Collections
...atic final int N = 10000;
static List<Integer> sourceList = new ArrayList<>();
static {
for (int i = 0; i < N; i++) {
sourceList.add(i);
}
}
@Benchmark
public List<Double> vanilla() {
List<Double> result = new Array...
How do I expand a tuple into variadic template function's arguments?
...riadic template function. Here is a small helper class which creates index array. It is used a lot in template metaprogramming:
// ------------- UTILITY---------------
template<int...> struct index_tuple{};
template<int I, typename IndexTuple, typename... Types>
struct make_indexes_i...
How does one make an optional closure in swift?
...es to properly scope the ? operator. As an example, to declare an optional array of integers, write the type annotation as (Int[])?; writing Int[]? produces an error.”
– Cezar
Jun 24 '14 at 20:59
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How does StartCoroutine / yield return pattern really work in Unity?
...for returning "ordinary" things one by one, such as simply the items in an array, etc.)
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How to check if element exists using a lambda expression?
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@MalteHartwig tested in a 10kk ArrayList with a simple object trying to find the last element. gives a 2ms difference 131ms against 133ms for your. on a 1kk array list yours if faster by 2ms (55ms to 53ms). So we can say that yours is better :)
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What is the difference between pluck and collect in Rails?
...cording to Rails guides, pluck directly converts a database result into an array, without constructing ActiveRecord objects. This means better performance for a large or often-running query.
In addition to @apneadiving's answer, pluck can take both single and multiple column names as argument:
Cli...