Ben Davies

Kotlin Programming for Beginners: A Step-by-Step Guide to Learning Kotlin Programming Language and Start Building Mobile & Server-Side Applications from Scratch Ben Davies

LEARN THE FUNDAMENTALS OF KOTLIN PROGRAMMING TO BUILD APPS

Ktln a cross-platform, statically td, general-purpose programming language with type nfrn. Ktln dgnd to ntrrt fully with Jv, nd the JVM version of Ktln' standard lbrr depends n th Java Cl Lbrr, but t inference llw its syntax to b mr concise. Ktln mainly trgt the JVM, but also ml t JavaScript (.g., fr frntnd wb ltn using React) r native code (via LLVM); e.g., for ntv iOS apps hrng business lg with Andrd . Lngug dvlmnt t r borne by JtBrn, whl the Ktln Foundation rtt th Ktln trademark.

GTTNG STARTED B Syntax

Dfnng kg

Pkg ftn should b at th top of the source file:

package my.demo

import java.util.*

// ...

It is nt rurd t mth drtr nd kg ur files n b ld rbtrrl in th file tm. Dfnng functions

Funtn hvng tw int parameters wth int rturn t

fun sum(a: Int, b: Int): Int {

return a + b

}

Funtn with n expression body nd nfrrd return type:
fun sum(a: Int, b: Int) = a + b

Funtn rturnng n mnngful vlu

fun printSum(a: Int, b: Int): Unit { println("sum of $a and $b is ${a + b}")

}

rturn t n b omitted
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