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Ace the Front End Interview

Design Patterns in JavaScript

## Problem statement

In this challenge, you have to reverse iterate a simple hashmap and display its key values.

You need to implement the `reverseIterate` function that accepts the hashmap, `items`, and displays the key values in **reverse**. To reverse iterate, make use of the `ReverseIterator` class. It contains the following functions:

* `hasprevElement`: checks if there is a previous element

* `last`: returns the last key value in the map

* `previous`: returns the previous key value in the map 

Apart from the functions mentioned above, you also need to define its `constructor`.

## Input

Calling `reverseIterate` function on a simple hashmap

## Output

Hashmap’s values displayed in reverse order

## Sample input
```
reverseIterate({'name': 'Anne', 'age': '23', 'gender': 'Female', 'Occupation': 'Engineer'})
```

## Sample output
```
"Engineer"
"Female"
"23"
"Anne"
```

# Problem statement

In this challenge, you have to reverse iterate a simple hashmap and display its key values.

You need to implement the `reverseIterate` function that accepts the hashmap, `items`, and displays the key values in **reverse**. To reverse iterate, make use of the `ReverseIterator` class. It contains the following functions:

* `hasprevElement`: checks if there is a previous element

* `last`: returns the last key value in the map

* `previous`: returns the previous key value in the map 

Apart from the functions mentioned above, you also need to define its `constructor`.

# Input

Calling `reverseIterate` function on a simple hashmap

# Output

Hashmap’s values displayed in reverse order

# Sample input
```
reverseIterate({'name': 'Anne', 'age': '23', 'gender': 'Female', 'Occupation': 'Engineer'})
```

# Sample output
```
"Engineer"
"Female"
"23"
"Anne"
```

In this challenge, you have to implement the iterator pattern to solve the given problem.


Introduction to Design Patterns

Creational Patterns

Structural Patterns

Behavioral Patterns

Architectural Patterns

Challenge: Iterator Pattern

Problem statement