Logo

Go on. Explore!

lvl 0 • 0 xp

lvl 1

HomeMarketDecksInterests
Kotlin

Kotlin

memorize.aimemorize.ai (lvl 286)
Star 0%
Star 0%
Star 0%
Star 0%
Star 0%
(0)
(0)
(0)
26 cards
()
Section 1

Preview this deck

ClassCastException

Front

1 / 26

Kotlin
Star 0%
Star 0%
Star 0%
Star 0%
Star 0%

0.0

0 reviews

5
0
4
0
3
0
2
0
1
0

Active users

0

All-time users

0

Favorites

0

Last updated

6 years ago

Date created

Mar 1, 2020

Cards (26)

Section 1

(26 cards)

ClassCastException

Front

cast object without first checking it has right type- kotlin combines check and cast into single operation

Back

variables

Front

no type needed, if no initializer then must have explicit type

Back

default modifier

Front

public and can be omitted

Back

block body

Front

a function written with it's body in curly braces

Back

function return

Front

comes after parameter, separated by semicolon

Back

function parameter

Front

type is written after it's name

Back

triple quoted string

Front

don't need to eacaps any symbols.

Back

var

Front

for variable, mutable

Back

val

Front

for value, immutable reference, object it points to can be mutable

Back

value objects

Front

classes containing only data and no code

Back

how to print

Front

write println

Back

Why use Kotlin

Front

a. statically typed, b. support nullable types, c. function types, d. open source

Back

expression body

Front

function returning an expression directly

Back

Functional Programming

Front

a. first-class functions as values, b. immutability- state can't change after creation, c. no side effects- pure functions return same results given same input and don't interact with outside world

Back

assignments

Front

statements- top-level element in enclosing block and doesn't have it's own value

Back

public

Front

default visibility so can be omitted

Back

destructuring declaration

Front

initialize two variables with the contents of a Pair directly val (number, name) = 1 to "one"

Back

type inference

Front

compiler analyzes data type of expression

Back

Nullable

Front

marking type as nullable done by adding question mark

Back

extension function

Front

a function that can be called as a member of a class but is defined outside of it.

Back

if

Front

an expression with result value- similar to ternary

Back

string templates

Front

use $ in front of variable name, {$} when more complex like args[0]

Back

property

Front

declare with val or var, accessors created automatically, call properties directly without referencing getter or setter. person.isMarried=false

Back

fun

Front

declaration for function, can be top level of file, outside class

Back

infix call

Front

method name is placed immediately between the target object name and the parameter, with no extra separators infix fun Any.to(other: Any) = Pair(this, other)

Back

property

Front

combination of field and accessors, val has getter and var has getter and setter

Back