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Iterators

Codecademy

An iterator repeatedly executes a code block a number of times. This number may be determined or indefinite. In the latter case, an iterator will endlessly execute a code block until some external eve...

Iterators

Codecademy

Iterators are used to loop over a group of data members, or a collection. An iterator is an object that implements the iteration protocols. Many built-in data types ( strings , arrays , maps , sets , ...

Iterators & Generators

Python Practice Book

5. Iterators & Generators  5.1. Iterators  We use for statement for looping over a list. for i in [ 1 , 2 , 3 , 4 ]: ... print ( i ) ... 1 2 3 4 If we use it with a string, it loops over its charac...

Iterators

Codecademy

Iterators are used to loop through a collection of data. They are also used to repeat processes a preset or infinite amount of times. Iteration Types In Lua, there are multiple ways to iterate through...

Iterators Explained: The Magic Behind Your For Loops

Python in Plain English

Ever wondered what really happens when you write a for loop? Or why some objects work with loops while others don't? Let me share a story. I was pair programming with a colleague when they asked, “Why...

Iterator

Codecademy

An iterator is an object that allows code to step through collections. Java has Iterator and ListIterator objects, both imported through the java.util package. The main difference between the two is t...

For Each

Essential Java

With Java 5 and up, one can use for-each loops, also known as enhanced for-loops: List strings = new ArrayList(); strings.add("This"); strings.add("is"); strings.add("a for-each loop"); for (String st...

Iterators

Codecademy

In Python, an iterator is an object representing a collection of elements (such as data or methods) where each element can be accessed by traversing through the collection to perform the required task...

Creating your own Iterable structure for use with Iterator or for-each loop.

Essential Java

To ensure that our collection can be iterated using iterator or for-each loop, we have to take care of following steps: The stuff we want to iterate upon has to be Iterable and expose iterator() . Des...

Iterator and Iterable

Essential Java

Versions [{“Name”:“Java SE 1.2”,“GroupName”:null},{“Name”:“Java SE 1.3”,“GroupName”:null},{“Name”:“Java SE 1.4”,“GroupName”:null},{“Name”:“Java SE 5”,“GroupName”:null},{“Name”:“Java SE 6”,“GroupName”:...

Using the raw iterator

Essential Java

While using the foreach loop (or “extended for loop”) is simple, it’s sometimes beneficial to use the iterator directly. For example, if you want to output a bunch of comma-separated values, but don’t...

Using Iterable in for loop

Essential Java

Classes implementing Iterable< interface can be used in for loops. This is actually only syntactic sugar for getting an iterator from the object and using it to get all elements sequentially; it makes...