Lists in Practice

Mutation, sort, and count.

items: list = [3, 1, 2, 3];
items.push(5);
items.order();
say(items);
say(items.countOf(3));

[1, 2, 3, 3, 5]
2

Notes

• order() sorts in place.
• countOf() counts exact value matches.
• map(f) / filter(f) return a new list from a function value or lambda.
• reduce(init, f) folds from required init; empty list returns init.
• flatMap(f) concatenates callback lists one level into a new list.
• some(f) / every(f) / findIndex(f) are bool predicates; find(value) is value search.
• zip(other) pairs to the shorter length. unique() keeps first occurrences in order.
• flatten() concatenates one level of nested lists. partition(f) splits into [matches, rest].

See Also

• Lists
• Built-in Methods