- 01Setting up (what you'll need)
- 02Your first output (print)
- 03Variables and types (var and annotations)
- 04Null safety (? and !)
- 05Branching (the if statement)
- 06Repeating (the for loop)
- 07Writing your own function
- 08Repeating (the while loop)
- 09Working with lists (List)
- 10Working with maps (Map)
- 11Classes (object orientation)
- 12Constructors
- 13Inheritance
- 14Named arguments
- 15Asynchronous work (Future, async, await)
- 16Working with strings
- 17The switch statement
- 18The ternary operator
- 19Extension methods
- 20[Project] Build a small inventory system
Named arguments
This lesson covers named arguments, which let you specify an argument by name.
Wrapping a parameter in {}, as in {type name}, lets the caller pass it as name: value. You can then pass only the arguments you need, in any order.
The sample code defines void greet(String name, {String title = 'Mr./Ms.'}) and calls it both with the title left out and with it supplied.
A common early stumble is the difference in syntax between ordinary (positional) arguments and named ones. A parameter wrapped in {} has to be passed with name: at the call site.
In professional work, almost every Flutter widget constructor is built from named arguments, which makes it obvious at the call site what each value means.
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