// Before: Code with side effects
fun orderCoffee (paymentCard: PaymentCard ) : Coffee {
val coffee = Coffee()
paymentCard.charge(coffee.price) // Side effect: Card payment
return coffee
}
// After: Pure function with side effects removed
fun orderCoffee (paymentCard: PaymentCard ) : Order {
val coffee = Coffee()
val transaction = Transaction(paymentCard, coffee.price)
return Order(coffee, transaction)
}💡 Two codes that look similar at first glance,
But one is dangerous and one is safe.
If you're curious about the difference, check out the lecture!
To avoid getting lost in complex business logic,
We need a compass called pure functions.
Minimize state changes,
Pure functions maximize,
Safe with referential transparency.
Create better code with the functional programming paradigm.
Learn what functional programming is and why you need it!
What is the difference between object-oriented and functional?
What are the benefits of functional programming in practice?
Learn the basics of functional programming with Kotlin!
The functional world starting with lambda expressions 🎯
Writing more flexible code with generics ⚡
The charm of higher-order functions that exchange functions ✨
Let's take a look at the core concepts of functional programming one by one!
Why should side effects be avoided? 🚫
Creating predictable code with referential transparency 🎯
Writing safe code with pure functions ✅
Creating flexible functions with currying 🔄
】 In addition to explanations of each concept, a workbook and detailed explanations are provided to help you improve your understanding. You can practice what you have learned right away, making it easier to understand. 🖊
Learn functional techniques that you can apply to real-world projects!
Practical Functional Programming with Payment Systems 💳
Creating bug-free code with immutability 🛡
Increasing reusability with higher-order functions ♻
Detailed lecture notes : 18 PDFs (approximately 50 pages), including diagrams and code for key sections
Lecture Slides : 42 pages of PPT, visualizing key content
All materials are downloadable : learn anywhere, anytime!
✅ Anyone who knows basic Kotlin grammar
✅ Those who want to apply functional programming in practice
✅ Anyone who wants to write better code
❌ For those who don't know basic Kotlin grammar
❌ Those who are already proficient in functional programming
IntelliJ IDEA (also available with Community Edition)
Understanding Kotlin's basic grammar
Passion to learn functional programming
Do you understand the basic syntax of Kotlin?
Want to learn the basics of functional programming?
Want to learn with practical, applicable examples?
If you checked everything, let's get started! 🎯
If you leave a review after taking more than 50% of the course,
" [Kotlin Grammar to Practice (Java to Kotlin Practice)] " Lecture
We'll give you a 50% discount coupon !
From basics to practice, an introductory course on Kotlin for Java developers
Come see us at a special discount price! 🚀
How to participate
Attend more than 50% of this course
After writing the course review, submit the registration form .
Issuing discount coupons (takes 1-2 days)
From basic grammar to practical Kotlin-like coding methods,
Complete your path to becoming a Kotlin master with functional programming! ✨
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