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<!DOCTYPE html><html><head><title>Kotlin is like TypeScript</title><meta charset="utf-8"><link rel="stylesheet" href="css/style.css"><link rel="stylesheet" href="css/highlightjs-github.css"><script src="js/highlight.9.4.0.js"></script><script>hljs.initHighlightingOnLoad();</script></head><body><a target="_blank" href="https://github.com/gi-no/kotlin-is-like-typescript"><img id="fork-me" src="http://nilhcem.github.io/swift-is-like-kotlin/fork-me.png"></a><div id="note">Kotlin is like TypeScript</div><div class="section"><div class="title">BASICS</div><div class="case"><div class="name">Hello World</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>println("Hello, world!")
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>console.log("Hello, world!");
</code></pre></div></div></div><div class="case"><div class="name">Variables And Constants</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>var myVariable = 42
myVariable = 50
val myConstant = 42
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>let myVariable = 42;
myVariable = 50;
const myConstant = 42;
</code></pre></div></div></div><div class="case"><div class="name">Explicit Types</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>val explicitDouble: Double = 70.0
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>const explicitDouble: number = 70;
</code></pre></div></div></div><div class="case"><div class="name">Type Coercion</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>val label = "The width is "
val width = 94
val widthLabel = label + width
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>const label = "The width is ";
const width = 94;
const widthLabel = label + width;
</code></pre></div></div></div><div class="case"><div class="name">String Interpolation</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>val apples = 3
val oranges = 5
val fruitSummary = "I have ${apples + oranges} " +
"pieces of fruit."
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>const apples = 3;
const oranges = 5;
const fruitSummary = `I have ${apples + oranges} ` +
"pieces of fruit.";
</code></pre></div></div></div><div class="case"><div class="name">Range Operator</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>val names = arrayOf("Anna", "Alex", "Brian", "Jack")
val count = names.count()
for (i in 0..count - 1) {
println("Person ${i + 1} is called ${names[i]}")
}
// Person 1 is called Anna
// Person 2 is called Alex
// Person 3 is called Brian
// Person 4 is called Jack
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>import * as _ from 'lodash';
const names = ["Anna", "Alex", "Brian", "Jack"];
const count = names.length;
for (let i of _.range(0, count)) {
console.log(`Person ${i + 1} is called ${names[i]}`)
}
// Person 1 is called Anna
// Person 2 is called Alex
// Person 3 is called Brian
// Person 4 is called Jack
</code></pre></div></div></div><div class="case"><div class="name">Inclusive Range Operator</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>for (index in 1..5) {
println("$index times 5 is ${index * 5}")
}
// 1 times 5 is 5
// 2 times 5 is 10
// 3 times 5 is 15
// 4 times 5 is 20
// 5 times 5 is 25
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>import * as _ from 'lodash';
for(let index of _.range(1, 6)) {
console.log(`${index} times 5 is ${index * 5}`)
}
// 1 times 5 is 5
// 2 times 5 is 10
// 3 times 5 is 15
// 4 times 5 is 20
// 5 times 5 is 25
</code></pre></div></div></div></div><div class="section"><div class="title">BASICS</div><div class="case"><div class="name">Arrays</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>val shoppingList = arrayOf("catfish", "water",
"tulips", "blue paint")
shoppingList[1] = "bottle of water"
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>let shoppingList = ["catfish", "water",
"tulips", "blue paint"];
shoppingList[1] = "bottle of water";
</code></pre></div></div></div><div class="case"><div class="name">Maps</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>val occupations = mutableMapOf(
"Malcolm" to "Captain",
"Kaylee" to "Mechanic"
)
occupations["Jayne"] = "Public Relations"
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>let occupations = {
"Malcolm": "Captain",
"Kaylee": "Mechanic",
};
occupations["Jayne"] = "Public Relations";
</code></pre></div></div></div><div class="case"><div class="name">Empty Collections</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>val emptyArray = arrayOf<String>()
val emptyMap = mapOf<String, Float>()
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>const emptyArray: string[];
const emptyDictionary: {[key: string]: number};
</code></pre></div></div></div></div><div class="section"><div class="title">FUNCTIONS</div><div class="case"><div class="name">Functions</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>fun greet(name: String, day: String): String {
return "Hello $name, today is $day."
}
greet("Bob", "Tuesday")
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>function greet(name: string, day: string): string {
return `Hello ${name}, today is ${day}.`
}
greet("Bob", "Tuesday");
</code></pre></div></div></div><div class="case"><div class="name">Tuple Return</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>data class GasPrices(val a: Double, val b: Double,
val c: Double)
fun getGasPrices() = GasPrices(3.59, 3.69, 3.79)
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>function getGasPrices(): [number, number, number] {
return [3.59, 3.69, 3.79];
}
</code></pre></div></div></div><div class="case"><div class="name">Variable Number Of Arguments</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>fun sumOf(vararg numbers: Int): Int {
var sum = 0
for (number in numbers) {
sum += number
}
return sum
}
sumOf(42, 597, 12)
// sumOf() can also be written in a shorter way:
fun sumOf(vararg numbers: Int) = numbers.sum()
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>function sumOf(...numbers: number[]): number{
let sum = 0;
for (let number of numbers) {
sum += number;
}
return sum;
}
sumOf(42, 597, 12);
</code></pre></div></div></div><div class="case"><div class="name">Function Type</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>fun makeIncrementer(): (Int) -> Int {
val addOne = fun(number: Int): Int {
return 1 + number
}
return addOne
}
val increment = makeIncrementer()
increment(7)
// makeIncrementer can also be written in a shorter way:
fun makeIncrementer() = fun(number: Int) = 1 + number
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>function makeIncrementer():(number) => number{
function addOne(number: number): number {
return 1 + number;
}
return addOne
}
let increment = makeIncrementer();
increment(7);
// makeIncrementer can also be written in a shorter way:
let makeIncrementer = () => (number: number) => 1 + number;
</code></pre></div></div></div><div class="case"><div class="name">Map</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>val numbers = listOf(20, 19, 7, 12)
numbers.map { 3 * it }
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>let numbers = [20, 19, 7, 12];
numbers.map((it) => 3 * it);
</code></pre></div></div></div><div class="case"><div class="name">Sort</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>listOf(1, 5, 3, 12, 2).sorted()
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>[1, 5, 3, 12, 2].sort();
</code></pre></div></div></div><div class="case"><div class="name">Named Arguments</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>fun area(width: Int, height: Int) = width * height
area(width = 2, height = 3)
// This is also possible with named arguments
area(2, height = 2)
area(height = 3, width = 2)
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>function area({width, height}:{width:number, height:number}):number {
return width * height;
}
area({width: 2, height: 3});
</code></pre></div></div></div></div><div class="section"><div class="title">CLASSES</div><div class="case"><div class="name">Declaration</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>class Shape {
var numberOfSides = 0
fun simpleDescription() =
"A shape with $numberOfSides sides."
}
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>class Shape {
numberOfSides = 0;
simpleDescription(){
return `A shape with ${this.numberOfSides} sides.`;
}
}
</code></pre></div></div></div><div class="case"><div class="name">Usage</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>var shape = Shape()
shape.numberOfSides = 7
var shapeDescription = shape.simpleDescription()
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>let shape = new Shape();
shape.numberOfSides = 7;
let shapeDescription = shape.simpleDescription();
</code></pre></div></div></div><div class="case"><div class="name">Subclass</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>open class NamedShape(val name: String) {
var numberOfSides = 0
open fun simpleDescription() =
"A shape with $numberOfSides sides."
}
class Square(var sideLength: BigDecimal, name: String) :
NamedShape(name) {
init {
numberOfSides = 4
}
fun area() = sideLength.pow(2)
override fun simpleDescription() =
"A square with sides of length $sideLength."
}
val test = Square(BigDecimal("5.2"), "square")
test.area()
test.simpleDescription()
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>class NamedShape {
numberOfSides: number = 0;
name: string;
constructor(name: string) {
this.name = name
}
simpleDescription():string {
return `A shape with ${this.numberOfSides} sides.`;
}
}
class Square extends NamedShape {
sideLength: number;
constructor(sideLength: number, name: string) {
super(name);
this.sideLength = sideLength;
this.numberOfSides = 4;
}
area(): number {
return this.sideLength * this.sideLength;
}
simpleDescription(): string {
return "A square with sides of length " +
this.sideLength + ".";
}
}
let test = new Square(5.2, "square");
test.area();
test.simpleDescription();
</code></pre></div></div></div><div class="case"><div class="name">Checking Type</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>var movieCount = 0
var songCount = 0
for (item in library) {
if (item is Movie) {
++movieCount
} else if (item is Song) {
++songCount
}
}
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>let movieCount = 0;
let songCount = 0;
for (let item in library) {
if (item instanceof Movie) {
++movieCount;
} else if (item instanceof Song) {
++songCount;
}
}
</code></pre></div></div></div><div class="case"><div class="name">Downcasting</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>for (current in someObjects) {
if (current is Movie) {
println("Movie: '${current.name}', " +
"dir. ${current.director}")
}
}
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>for (let current in someObjects) {
if (current instanceof Movie) {
console.log(`Movie: '${movie.name}', ` +
`dir. ${movie.director}`);
}
}
</code></pre></div></div></div><div class="case"><div class="name">Protocol</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>interface Nameable {
fun name(): String
}
fun f<T: Nameable>(x: T) {
println("Name is " + x.name())
}
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>interface Nameable {
name():string;
};
function f(x: Nameable) {
console.log("Name is " + x.name());
}
</code></pre></div></div></div></div></body></html>