for/in - loops through the properties of an object. Array.forEach () Syntax: array.forEach(callback( currentValue, currentIndex, array), thisArgument) array: It is the array on which we are iterating. You might make an iterator that counts backwards, or increment its value with more than one, or conditionally increment it, as long as it fits the behavior you wish to achieve, or the iterator value is used for other purpose. The for.in statement iterates a specified variable over all the enumerable properties of an object. En JavaScript, un iterador es un objeto que permite recorrer una colección y devolver un valor al terminar. JavaScript supports different kinds of loops: for - loops through a block of code a number of times. Ways of Iterating Array in JavaScript There are multiple ways for iterating arrays which are given below: 1. When your code uses an iterator, either in this form. Keep in mind iterators can be very flexible. The main difference between Iterator and the classic for loop, apart from the obvious one of having or not having access to the index of the item you're iterating, is that using Iterator abstracts the client code from the underlying collection implementation, allow me to elaborate. Woven in loop we want to run 5 times for example, we can declare an iterator with startign value 0, add 1 everytime the code is repeated and quit the loop when the value reaches 5.Ĭounter ++ is shorthand to say counter += 1, or counter = counter + 1 We use iterators to set the number of times a piece of code will repeat. While JavaScript provides maps, arrays and sets with an iterable property by default, regular JavaScript objects do not have this by default.
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