Lambda Expression
Lambda functions are a short and simple way to express tiny functions.
Lambda functions are also known as anonymous functions or closures.
They are functions without a name that can be used inline within the code.
return_type var_name = (parameters)=> expression;
Dart Anonymous Function
An anonymous function can have zero or more parameters with optional type annotations.
An anonymous function consists of self-contained blocks of code and that can be passed around in our code as a function parameter.
Syntax: (parameter_list) { statement(s) }