Generators are defined using the function* syntax, and they use the yield keyword to pause and resume their execution. When a generator is called, it returns an iterator, which can be used to control the execution of the generator. 0 What...
New features of the 4.12 Node.js driver release include: Redefinition of theChangeStreamclass as an async iterable. You can useChangeStreaminstances in any context that expects anAsyncIterator. Notably, change streams can now be used in Javascriptfor-awaitloops: ...
TheMongoWriteConcernErrortype now preserves the original top-level code inMongoWriteConcernError.code. Thecursor.toArray()method empties the current batch of documents into the array before calling the async iterator again. This change avoids the delays associated withasync/awaitexecution and improves ...
Asingletonis an object that has just one instance during the execution of a program. It is easy to achieve that in javascript with the help of closures. We acknowledge the fact that every function call creates a new closure. But how do we prevent another call of the outer function? It's...
You may already know that, in React, we may map over a collection of items (Such as an array) using various iterator methods, such asArray.prototype.mapor the trustyforloop outside JSX and generate Components or JSX Elements as we go. ...
in the same line, the Python interpreter creates a new object, then references the second variable at the same time. If you do it on separate lines, it doesn't "know" that there's already "wtf!" as an object (because "wtf!" is not implicitly interned as per the facts mentioned abov...
How to Create a StringStream in C++? Using the <sstream> header file, you can convert a string to create a StringStream object. All you need to do is use the type stringstream to create a constructor and pass the string as an input to it. The below example shows how to convert a ...
I mentioned earlier that when iterating elements with jQuery'seachiterator,thisis always a DOM element. Technically, it is more accurate to say that within aneachiteration,thisis the subject of the current iteration loop. This distinction is important because jQuery'seachmethod can be used to ...
It is always best to cache the iterator (anchors.length) due to the reasons given above, though it is especially important when dealing with HTMLCollection objects (as returned by document.getElementsByTagName). This is because an HTMLCollection is live, i.e. it is updated whenever the DOM...
In the Node.js file system module, several functions have the parameter mode. Its value is used to specify file permissions, via an encoding that is a holdover from Unix: Permissions are specified for three categories of users: User: the owner of the file Group: the members of the group...