Functions
Dart Functions
Defining Dart Functions
Dart functions use typed parameters and return types with =>.
Introduction to Dart Functions
Dart functions are a core part of the language that allow you to define reusable blocks of code. They can have typed parameters and return types, making your code more predictable and easier to debug. In this tutorial, we'll explore the syntax and features of Dart functions.
Basic Function Syntax
A function in Dart is defined using the void keyword if it does not return a value, or with a specific return type if it does. The function parameters are defined within parentheses. Here's a simple example:
Function with Parameters
Functions can accept parameters, allowing you to pass data into them. You specify the type and name of each parameter in the parentheses:
Returning Values from Functions
To return a value from a function, use the return statement along with the value you wish to return. The function's return type must be specified:
Arrow Syntax for Functions
For functions that contain a single expression, Dart provides an arrow syntax for conciseness. This is known as an expression body syntax, using the => operator:
Optional Parameters
Dart functions can have optional parameters, which can be either positional or named. This allows for more flexibility in function calls. Optional parameters are defined using square brackets:
In this example, age is an optional parameter. If it isn't provided, the function still executes without error.
Conclusion
In this guide, we've covered the basics of creating and using functions in Dart, including typing parameters, returning values, and using arrow syntax. Understanding these concepts is essential for writing effective Dart code. Continue exploring more advanced topics, such as named arguments, in the next post.
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