sum

sum(numbers: Bag<Integer>)  : Integer
sum(numbers: Bag<Float>)    : Float

The sum of a collection of integer numbers or a collection of floating-point numbers.

For example, on integers, sum([1, 2, 3]) equals 6.
Likewise, on floats, sum([1.1, 2.1, 3.1]) equals 6.300000000000001.
- Keep in mind that floating-point arithmetic is generally not precise!
You can define a collection in various ways, not just as a list of literal numbers.
- See Collections for more detail on working with collections.
- Importantly, a collection's elements must all be of the same type. As such, sum([1.1, 2, 3.1]) has a type-error since the list is not well-formed. The fix is to replace integer 2 with 2.0 or 2. to have it be treated as a float.
- You can use int and float to convert to integers and to floats, respectively.
Note that this method accepts both Lists and Bags ─since Lists subtype Bags

See also