Maps and filters are typical for functional languages. A map is a function of the form map(func, coll), where func is a (often anonymous) function that is successively applied to every element of the coll collection, so map returns a new collection. Some examples are as follows:
- map(x -> x * 10, [1, 2, 3]) returns [10, 20, 30]
- cubes = map(x-> Base.power_by_squaring(x, 3), collect(1:5)) returns [1, 8, 27, 64, 125]
The map function can also be used with functions that take more than one argument. In this case, it requires a collection for each argument; for example, map(*, [1, 2, 3], ...