Gain insights into Dart, an object-oriented language crucial for Flutter development. Delve into its fundamentals and prepare to craft high-quality native interfaces on iOS and Android.

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Learn Dart for free with this interactive course. Dart is a clean, simple, class-based, object-oriented language with more structure than JavaScript, the programming language it's heavily based on. However, you can't have a conversation about Dart without mentioning Flutter. 

Flutter is Google's mobile UI framework for crafting high-quality native interfaces on iOS and Android. Flutter applications are written using the Dart programming language, which has helped make Dart a beloved language by the developer community. Before you can start fluttering out Flutter applications, you must learn Dart. This course will help you learn the fundamentals of Dart and start your journey to learning Flutter. Start learning today.

Learn Dart: First Step to Flutter

# Problem statement

In this challenge, you need to create a recursive function, `sum`, which returns the total sum of the integers in a List.

## Input

The input of the function is a list of integers, `numberList`, and the index of the last item in `numberList`.


## Output
The output will be the sum of all the integer in `numberList`.

## Sample input
```
sum([1,2,3,4,5], 4)
```

## Sample output
```
15
```
## Test yourself

Write your code in the given area. Try the exercise by yourself first, but if you get stuck, the solution has been provided. Good luck!

Test yourself and implement what you have learned so far in this chapter.

Introduction

Getting Started with Dart

Data Types and Variables

Operators

Dart's Collection

Control Flow Statements

Exploring Functions

Classes

Where to Go From Here

Challenge: Sum of Lists

Problem statement