+  add
*  mul
-  sub
/  div
** power
[3,7]      lists
{a:1, b:3} objects
(x) => x*x functions (oneliners only)

distance = 12
time = 5
speed = distance / time

2+3

distance = 150
time = 6
time
distance/time
25 == distance/time
30 == distance/time

# String
a = "Volvo" 
5 == a.length
'l' == a[2]

# Math
5 == sqrt 25 

# Date
c = new Date() 
2018 == c.getFullYear()
c.getHours()

# Array
numbers = [1,2,3] 
2 == numbers[1]
numbers.push 47
4 == numbers.length
numbers 
47 == numbers.pop()
3 == numbers.length
numbers

# Object
person = {fnamn:'David', enamn:'Larsson'}
'David' == person['fnamn']
'Larsson' == person.enamn

# functions (only one liners allowed!)
square = (x) -> x*x
25 == square 5

serial = (a,b) -> a+b
2 == serial 1,1
5 == serial 2,3

parallel = (a,b) -> a*b/(a+b)
0.5 == parallel 1,1
1.2 == parallel 2,3

factorial = (x) -> if x==0 then 1 else x * factorial(x-1)
3628800 == factorial 10

fib = (x) -> if x<=0 then 1 else fib(x-1) + fib(x-2) 
1 == fib 0
2 == fib 1
5 == fib 3
8 == fib 4
13 == fib 5
21 == fib 6

f = 9**x - 6**x -4**x
solve_bin f,1,2,5
solve_bin f,1,2,50