Lists

Ordered and mutable. Index with [] (negative indices allowed).

let xs = [1, 2, 3]
xs.push(4)            # [1, 2, 3, 4]
print(xs[0])          # 1
print(xs[-1])         # 4
xs[0] = 99            # assign by index
print(len(xs))        # 4
print(xs.pop())       # 4  (removes and returns last)

Iterate with for … in:

let total = 0
for x in [10, 20, 30] {
    total += x
}
print(total)          # 60

Take a range with a slice: xs[1:3], xs[:2], xs[-2:].

See list methods for push, pop, contains, insert, etc.