Iterable and Iterators In Dart

Iterable and Iterators In Dart

In this article, we are going to talk about Itrables and how it uses the iterator to access the elements sequentially.

Introduction

In this article, we are going to talk about Itrables and how it uses the iterator to access the elements sequentially.

What is an iterable

It's a *collection, *A collection of values, or “elements”, that can be accessed sequentially each element at a time.

_For Example, _List and Set classes are both Iterable, as are most classes in the dart:collection library.

Each element of the iterable is accessed by getting an Iterator using the iterator getter and using it to step through the values. Stepping with the iterator is done by calling Iterator.moveNext, and if the call returns true, the iterator has now moved to the next element, which is then available as Iterator.current. If the call returns false, there are no more elements.

We can also iterate over the elements of an Iterable using the for-in loop construct, which uses the iterator getter behind the scenes.

For example, you can iterate over all of the keys of a Map, because Map keys are iterable.

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Note:_ Although Map doesn’t implement Iterable, you can get Iterables from it using the Map `keys__ and _values_` properties._

Advantages of iterables

Besides being able to use them with a for-in loop, an iterable gives you access to lots of other features.

For example, Because of some methods available, such as mapwhereany, and takeWhile etc.

The `Iterable_` class provides two methods that you can use to verify conditions:_

_any()_: Returns true if at least one element satisfies the condition.

_every()_: Returns true if all elements satisfy the condition.

iterables dart collection iterators lists

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