Functions

User-defined functions

For performing repetitive calculations, functions can be defined. A function definition:

• starts right at the beginning of the line,
• its name can contain spaces,
• followed by the parameters listed in parentheses, separated by commas,
• then a closing parenthesis is followed by a :,
• the body of the function starts with at least one space from the beginning of the line.

A function can be called by its name, followed by listing the parameters in parentheses, separated by commas.

The function name and its body appear with a gray background.

vacation cost(people count, accomodation per day):
	tax = if people count <= 3 then 0% else 10%
	(people count * accomodation per day) + tax

vacation cost(3, $30)
vacation cost(6, $25)
vacation cost(9, $20)

Builtin Functions

• pi()
• e()
• abs(num)
• ln(num)
• lg(num)
• log(num, num)
• ceil(num)
• floor(num)
• round(num)
• round_dp(num, decimal places)
• sin(angle) -> num
• cos(angle) -> num
• tan(angle) -> num
• asin(num) -> angle
• acos(num) -> angle
• atan(num) -> angle
• nth(Matrix, index)
• transpose(Matrix)
• sum(Matrix)

sum([1, 2, 3])
transpose([1, 2, 3]) * [1, 2, 3]
pi()
e()
abs(-3)
ln(2)
lg(2)
log(2, 10)
ceil(12.3)
floor(12.3)
round(12.51)
round_dp(12.549, 2)
sin(90degree)
cos(90degree)
nth([1, 2, 3], 2)