The Complete Dart Development Guide

Build a degree app in Dart that uses nested if statements to map scores to letter grades (A to F with plus/minus), and explore random scores via the math library.

Explain Dart number properties and functions, including isOdd, isFinite, isInfinite, isNaN, absolute value, and rounding methods (round, floor, ceil, and rounding toward zero), plus the remainder operator.

Learn how to read user input in a Dart console app by importing dart:io, prompting for age or birth year with readLineSync, converting to numbers, and computing age with DateTime.now().year.

Learn how to handle runtime errors in Dart by using try-catch blocks, printing error messages, and applying specific catches for format exceptions, with an infinite loop to retry input.

Explore how lists, sets, and maps in Dart are iterable data structures that store multiple values, including dynamic types, accessed by index or key, and traversed with for loops.

Learn how to throw and handle exceptions in Dart using throw, try, and catch, with practical examples like an age calculator app validating birth year and invalid data handling.

Explore how Dart lambda expressions create anonymous functions in one-line or expression bodies, store them in variables, and apply them with for-each on lists.

Explore higher order functions in Dart, passing functions as parameters, using examples like some, edge, and for each, including lambda expressions.

Explain how the where function filters a list or set by a test, returning elements that satisfy it and showing first, last, index, remove, and optional parameters.

Explore how mixins enable combining class functionality in Dart, how abstract mixins work, and when to use extends with mixins or implements to share behavior.

Explain how streams differ from futures by producing a sequence of values over time, using periodic streams, listening to data, error, and done events, and controlling with subscription cancel.

Learn Dart file system basics by creating, checking file existence with exists and exists sync, reading and writing, deleting, and copying files with async and sync variants.

Create a final project in Dart that builds a quiz app with a math question model, input handling, and null safety using safe parsing and default values.