When to use an iterator in JavaScript?
Summary: In this tutorial, you will learn about the JavaScript iterator and how to use iterators to process a stream of data more efficiently. When you have an array of data, you typically use a for loop to iterate over its elements. For example: the for loop uses the variable i to track the index of the array of ranges.
Table of Contents
How are iterables different from generators in JavaScript?
Iterables that can iterate only once (such as generators) generally return this from their @@iterator method, while iterables that can iterate many times should return a new iterator on each invocation of @@iterator. You can make your own iterables like this:
When is an object iterable in Java?
The value of the done property indicates that there is no more value to return and the value of the property is set to undefined. An object is iterable when it contains a method called [Symbol.iterator] which accepts no arguments and returns an object that conforms to the iterator protocol.
What do you need to know about the Ajax application?
AJAX is a misleading name. AJAX applications can use XML to transport data, but it is just as common to transport data as plain text or JSON text. AJAX allows web pages to be updated asynchronously by exchanging data with a web server in the background.
What are loops and iterations in JavaScript for?
Loops offer a quick and easy way to do something repeatedly. This chapter of the JavaScript Guide introduces the different iteration statements available for JavaScript. Loops offer a quick and easy way to do something repeatedly. This chapter of the JavaScript Guide introduces the different iteration statements available for JavaScript.
Which is better foreach loop or iterator in Java?
But if you change your mind and use LinkedList instead of ArrayList, suddenly the performance will be terrible, because every time you access list.get(i), the linked list will have to iterate through all its elements up to the nth. An iterator (and thus the foreach loop) doesn’t have this problem.
When to use reverse for loop or reverse iterator in Java?
When you use a for-each or for loop, deletion is not allowed or causes an error because deleting while looping through the collection causes the indices of each element in the collection to change. Therefore, you must use a reverse for loop or use an iterator to avoid introducing an error. See also this answer. — user504342 05 Apr