Comprehensive Guide Kotlin and Jetpack Compose: Zero to Hero

Install IntelliJ IDEA community edition on Windows, Mac OS, or Linux by downloading the appropriate installer, and choose the free edition over the paid ultimate version.

Explore Kotlin as a modern, multi-platform language developed by JetBrains with clear syntax and seamless Java interoperability for Android apps using Jetpack Compose.

Create a new Kotlin project in IntelliJ IDEA, configure the language and JDK, write a main function, and run to see 'Hello World' printed in the console.

Explore Kotlin variables by declaring mutable var and immutable val, assign language and car values like English and Toyota, print results, and observe val cannot be reassigned while var can.

Explore literals in Kotlin, including number, character, and string literals, and distinguish between single-quoted characters and double-quoted strings while reviewing int, long, byte, short, float, and double types.

Explore Kotlin data types, including numbers, strings, and characters, and learn how to use them effectively within your programs.

explains how to declare int and long variables, use explicit types, perform arithmetic, and print results, covering floats, doubles, type inference, and println vs print in Kotlin.

Build a BMI calculator in Kotlin by inputting height in meters and weight in kilograms, computing BMI as weight divided by height squared, and printing the result.

Learn how to create a Kotlin program, define a main function, and read user input from the keyboard using readLine, then print the input to the standard output.

Explore Kotlin input handling and nullability with readLine, convert to int and boolean, and split lines to pair first and last names.

Revisit the BMI calculator, run the app, and enable user input with readLine, prompting for height and weight, converting to double, and computing BMI from the values.

Discover how strings power Kotlin and Jetpack Compose apps, with examples from hello world and other usages, showing how to work with strings in various ways.

Learn strings in Kotlin by declaring variables, using the length property to get characters count, printing results, and handling empty strings with zero length.

Learn string concatenation in Kotlin by using the plus operator to join string variables, build a full name with a space, and print the result to see the combined output.

Explore concatenating strings with other data types in Kotlin, creating variables that combine a first name, an integer, and a boolean, then print results to observe the outcome.

Learn how string concatenation works in Kotlin by starting with a string and then adding other values. The lecture demonstrates avoiding type errors when combining strings with numbers or variables.

Repeat a string in Kotlin using the repeat function and print the result, then use the escape sequence \n to insert new lines, producing four lines.

Explore how escape sequences let you include quotes inside strings in Kotlin and Jetpack Compose, using backslashes to escape quotes, handle errors, and print the final output.

Learn how to manage large text in Kotlin using raw strings instead of concatenating with plus signs. Use trimIndent to remove indentation and print the text neatly.

Learn how trim indent removes leading whitespace to produce neat text output in Kotlin strings. Understand essential string operations and how indentation affects display in Kotlin and Jetpack Compose projects.

Explore booleans in Kotlin, representing true or false to drive decisions for dark or light themes, use not to invert conditions, and combine with and to display a dark icon.

Learn how logical operators not, and, or evaluate boolean expressions, using examples with humid and rain to illustrate negation, conjunction, and disjunction in Kotlin code.

Learn how Kotlin uses comparison operators to evaluate conditions and drive decisions by comparing ages with less than, greater than, and less than or equal.

Understand how for loops execute code multiple times to handle repetitive tasks like printing each character of a text using a print line.

Explore executing loops with inclusive and exclusive ranges in Kotlin, using a print line function to iterate from 1 to 10 and employ string templates for each line.

Explore exclusive loops in Kotlin by using the until keyword to create an exclusive range, contrasting it with inclusive ranges and printing lines from one to ten.

Master step-based for loop execution in Kotlin by using an exclusive range and a step size to skip values, printing 1, 3, 5, 7, and 9.

Learn to loop from a larger value down to a smaller one using the down to concept, with range examples from ten to one and applying to collections.

Explore nested loops by pairing an outer loop (1 to 5) with an inner loop (1 to 4) to print lines of asterisks, generating five lines of four stars.

Explore how the if expression in Kotlin evaluates a condition and executes a code block when true, printing good morning and controlling your application's flow.

Explore the else keyword in if statements by using an else branch to run code when the value is false, ensuring exactly one branch executes.

Demonstrate using if statements to classify a number as positive, negative, or zero. Refactor with else if and nested ifs to improve efficiency and readability.

Improve the BMI calculator by using height and weight to compute BMI and classify it as underweight, normal, overweight, or obese with an if statement in Kotlin and Jetpack Compose.

Apply conditional execution in kotlin to classify bmi values into underweight (<18.5), normal (<25), overweight (<30), and obese (≥30) using if and else if and print the result.

Build a rock, paper, scissors game where the computer randomly picks and you choose a counter. Apply the standard rules to decide the winner.

Develop a Kotlin rock-paper-scissors project that uses a main function, a constant options list, a get game choice function, random selection, input validation, and result printing.

illustrate the when statement as a readable alternative to if, reading a number and using the mod operator to decide even or odd with arrow branches that print the result.

Show a when statement using range conditions with the in keyword, returning good morning, good evening, good afternoon, or good night, plus an else for invalid input.

Explore how while loops execute actions while a condition remains true, contrast them with for loops, and learn to manage or avoid infinite loops in Kotlin programming.

Learn how to implement a while loop in Kotlin to print a line ten times, using i < 10 as the termination condition and i += 1 or ++.

Learn the difference between while and do while loops, noting pretest versus post test. See how the do while loop prompts for user input and repeats until zero.

Move code from the main function into custom Kotlin functions, define functions with fun, pass parameters like message, and call these functions to improve readability and reusable code.

Create a Kotlin function that accepts parameters A and B as ints, prints the sum with a string template, and demonstrates reusing the function with C and D.

Learn to write Kotlin functions that return values, compare two ints to find the max with an if statement, and call the function from main to print the result.

Kotlin single-expression function techniques by inlining a variable and returning a conditional value, returning A if A > B, otherwise B.

Explore Kotlin's nullability by seeing how variables are non-null by default, learn how to mark a type as nullable with a question mark, and handle null assignments safely.

Learn how to operate on a nullable string in Kotlin, call uppercase with a nullable receiver, understand null pointer exceptions from non-null asserted calls, and apply safe alternatives.

Apply the classic if-else approach to handle nulls in Kotlin. Check non-null language, uppercase it, or fall back when null, and observe runtime behavior with a print line.

Discover how to handle nullable types in Kotlin with the Elvis operator, providing fallback text when values are null, and simplify null checks.

Learn how the let scope function handles nullable values in Kotlin, transforming to a non-nullable string for safe operations like uppercase, lowercase, and length, with Elvis fallbacks.

Discover collections in Kotlin, including arrays, lists, sets, and maps, and how immutable size, mutable elements, duplicates, ordering, and key-based access shape data handling.

Explore how to declare and work with arrays in Kotlin, access elements by index, loop with for each, for and ranges, and update values while noting arrays have fixed size.

Learn how lists work in Kotlin, including mutable vs immutable lists, accessing elements, and updating size; compare with sets that remove duplicates and support add and remove operations.

Learn how to define and use maps in kotlin, including immutable and mutable maps, key-value pairs, accessing by keys, handling nulls with get or default, and removing elements.

Define objects by using classes as blueprints to create instances with state and behavior. Explore Kotlin's class and object model with cars, properties, and functions.

Develop a Kotlin stock profitability project using object-oriented programming, featuring a Stock class for symbol, shares and cost, plus a main function for user input and profit comparison.