Dart - Beginners Course

Introduce variables, constants, and comments in Dart, including single-line and multi-line formats, and show that comments don’t affect code, assist explanations, and guide use around the main function and output.

Explore how booleans and other data types define variables in Dart, where everything is an object, and learn about null, runtime type, and simple string interpolation.

Explore numbers in Dart by understanding int and double types and the generic num, and learn int.parse, handling type safety with strings, and using assignment operators for basic arithmetic.

Explore the string type in Dart by creating and printing strings, extracting substrings with start and end indices, using index of and trim, and splitting into parts with zero-based indexing.

compare the difference between a variable and a constant by declaring hello and world strings, printing them, and using the const keyword to prevent changes, unlike final variables, in dart.

Create a Dart console program that prompts for a name using standard input, outputs prompts with standard out, handles empty input with standard error, and uses ReadLineSync for synchronous input.

Explore enums, the simplest collection in Dart, declared outside the main function with values red, green, and blue. Print colors.red to view an enumerator and anticipate switches for flow control.

Explore how Dart uses lists as the core collection, declare and manipulate a list, inspect its length, access elements by index, and understand generics for type safety.

Create a set in Dart to compare with a list, noting that sets are unordered and do not allow duplicates, as shown by adding elements and printing results.

Learn how queues differ from lists by importing the Dart collection, and using add and remove from the ends to maintain an ordered line like a bank queue.

Explore maps as key-value pairs in Dart, printing keys and values, and accessing items by key rather than index. Demonstrate put if absent and how maps link keys to values.

Explore flow control with assert in Dart, which checks a condition is true. See an unhandled exception from a failed assertion when age is 15, illustrating thrown errors.

Learn conditional logic in Dart by using if and else statements, including nested conditions and scope. See how age-based expressions determine which code blocks run, illustrating polymorphic behavior.

Explore scope as the bubble where a variable lives, and see how variable lifetime and nested scopes cause undefined name errors, with sub scopes and highest level brackets shaping visibility.

Explore how the switch statement uses specific cases and a default to control flow, with break exiting the scope and examples like age 18 or 21 illustrating the behavior.

Explore how do and while loops control execution and how the value increments toward a max. Compare continue and break for flow control and avoid infinite loops with proper conditions.

Explore how the for loop uses a built-in range to iterate a list, and compare it with for each approach, which prints Brian, Heather, and Chris via an anonymous function.

Learn how to declare and call functions in Dart, including return types, void, parameters, and scope, with examples like dog years, square feet, and paint calculations.

Explore how optional parameters work in Dart, using default values, brackets to denote optionals, and end-of-parameter positioning, with examples that show handling missing names and conditional formatting.

Compare positional arguments with named parameters, learn how calling by name lets you pass arguments out of order, and see how optional named parameters work.

Explore functions as objects in Dart, including assigning a function to a variable and using it as an object. Learn when this is possible and useful, though not generally recommended.

Demystifies anonymous functions in Dart, showing them as internal functions used with forEach and where to filter and print a list of people, highlighting their signature.

Explore how Dart handles errors and exemptions, distinguishing unhandled exemptions from no such method errors, and how null values and method calls on null trigger these exceptions.

Master error handling with the try catch finally block, including catch all and catching specific errors. Learn to clean up resources like database connections and files to prevent uncaught crashes.

Master throwing and catching errors in Dart by using try-catch blocks, validating null values, and crafting custom exceptions to produce descriptive messages.