Collections and ranges

Most Tide programs end up moving little collections of values around.

Lists

Create a list with [...]:

let xs = [1, 2, 3]
query xs

Lists play nicely with comprehensions:

let xs = [1, 2, 3, 4, 5]
query [x * 10 for x in xs]

Built-ins like first, last, and count work on lists:

query first([10, 20, 30])
query last([10, 20, 30])
query count([10, 20, 30])

Dictionaries look like {key: value, ...} and are great for named data.

let person = {name: "Alice", age: 30}
query person.name
query person.age

Ranges are written a..b and are typically used as iterables.

query 1..5     // inclusive end
query 1..<5    // exclusive end

A classic Tide moment is: “make a range, then build a list from it”:

query [x * x for x in 1..10]

And if you just want a number out, use sum:

query sum(1..100)

Comprehensions are the bridge between them.