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Kotlin Fundamentals Cheat Sheet (DRAFT) by

Kotlin Fundamentals cheat sheet

This is a draft cheat sheet. It is a work in progress and is not finished yet.

Variables

val
Immuable variable
var
Muable variable
${vari­able}
Calling a variable

Output and Input

print()
Print on the line
 
print(­"­Hello World !")
println()
Print on the line and go back to the line
 
printl­n("Hello World !")
readLine()
Function to read the enter of the user
`var hello: String = readLine()

Functions

fun
Keyword for initia­lizing a function
hello
Name of the function
()
Parameters (varia­bles)
{ }
Content of the function
return
Return the value of the function (not required)
function()
call the function
 
fun hello () {

printl­n("hello world")

}
  

Data Types

var foo: String = "­hel­lo"
Variable with data type specif­ication
: Int
Int (Integer)
-32 768 to 32 767
: Byte
Byte (Integer)
-128 to 127
: Short
Short (Integer)
-32 768 to 32 767
: Long
Long
-92233­720­368­547­75808 to 922337­203­685­4775808
: Double
Double
1.7e−308 to 1.7e+038
: Char
Character
/
: Boolean
Boolean
 
true
or 
false
: String
String
/
: Float
Float
3.4e−038 to 3.4e+038
In Kotlin, variables can detect automa­tically the data type of the value in the variable but if you want to specify a data type (i.g. editing the variable)

For the float you should add a 
F
behind the value of the float variable