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1+1
1/2 -- float result
1//2 -- result without decimal

"hello"
"hello" ++ "worlds"

["hello", "worlds"]
[1,2,3,4]
++ -- concat list
-- Cons operator insert at head of list
1::[2,3,4]

List.range 1 5 -- 1 to 5

List.head List.range 1 5

List.tail

True
False
1==1

1/=1 -- false

("elm", 40, True)

person = {name = "John", age = 30} -- name and age are called fields
person.name
.name person
-- Update record (create record)
{person | email "doe"}

add a b = a+b
-- <function> : number -> number -> number
add 40 50 

add2 = add 2
add2 10 -- 12

ok = List.range 1 5
List.map (\a -> a * 2) ok

fib n = if n < 2 then 1 else fib(n-1) + fib(n-2)
List.map fib ok