A linked list is like a conga line. Everyone holds the hips of the person in front of them and their hips are held in turn by the person to their rear, excepting only those in the front and the back. The only way to add people to the line is to find the right … Read more
You can iterate over c.most_common() to get the items in the desired order. See also the documentation of Counter.most_common(). Example: >>> c = collections.Counter(a=1, b=999) >>> c.most_common() [(‘b’, 999), (‘a’, 1)]
Lists Lists allow duplicate items, can be accessed by index, and support linear traversal. ArrayList – An array-based list that doesn’t support generic types. It does not enforce type safety and should generally be avoided. List – An array list that supports generic types and enforces type-safety. Since it is non-contiguous, it can grow in … Read more
The dot operator is used for accessing attributes of any object. For example, a complex number >>> c = 3+4j has (among others) the two attributes real and imag: >>> c.real 3.0 >>> c.imag 4.0 As well as those, it has a method, conjugate(), which is also an attribute: >>> c.conjugate <built-in method conjugate of … Read more
You can easily tell laravel to load a relation with a single command: $model->load(‘relation’); Will tell it to refresh the relation collection, and $model->relation will now show the correct values. Also unloading a relation will be like this: $model->unsetRelation(‘relation’)
I’ve come to the same conclusion that there’s something wrong with the Form component and can’t see an easy way to fix it. However, I’ve come up with a slightly less cumbersome workaround solution that is completely generic; it doesn’t have any hard-coded knowledge of entities/attributes so will fix any collection it comes across: Simpler, … Read more
So either of these are valid ways to do it: mongo <dbname> –eval ‘db.<collection>.drop()’ # ^^^^^^^^ ^^^^^^^^^^^^ db.<collection>.drop() # ^^^^^^^^^^^^ For example, for a collection mycollection in a database mydb you would say: mongo mydb –eval ‘db.mycollection.drop()’ db.mycollection.drop() This is the way I fully tested it, creating a database mydb with a collection hello. Create … Read more
The .NET 4.0 Framework introduces several thread-safe collections in the System.Collections.Concurrent Namespace: ConcurrentBag<T> Represents a thread-safe, unordered collection of objects. ConcurrentDictionary<TKey, TValue> Represents a thread-safe collection of key-value pairs that can be accessed by multiple threads concurrently. ConcurrentQueue<T> Represents a thread-safe first in-first out (FIFO) collection. ConcurrentStack<T> … Read more
Java 8 and above: List<String> namesList = personList.stream() .map(Person::getName) .collect(Collectors.toList()); If you need to make sure you get an ArrayList as a result, you have to change the last line to: … .collect(Collectors.toCollection(ArrayList::new)); Java 7 and below: The standard collection API prior to Java 8 has no support for such transformation. You’ll have to write … Read more
it’s easy to do in Kotlin: // v— the variable type can be removed var nameMap: MutableList<String> = persons.map { it.name }.toMutableList(); IF you want an immutable List, it can simplify as below: // v— the variable type can be removed var nameMap: List<String> = persons.map { it.name }; OR using function reference expression instead: … Read more