Array
An array is a collection of stored data that can hold values of various data type. Arrays themselves are considered to be a composite data type. Python uses lists as an equalivalent type.
Syntax
Arrays are often created by using square brackets []
with a comma-separated list of individual elements inside:
array = [element0, element1, element2, element3]
Nested arrays (arrays within arrays) are also possible:
nested = [elementB, elementC]
outer = [elementA, nested, element4]
The length of the outer
array is 3 elements-long because the inner nested
array counts as an individual element. By itself, the nested
array is 2 elements-long.
Index Number
Array elements are usually referenced by an index number, which represents their position in the sequence.
The indices of most arrays start with 0:
groceryList = ["milk", "cookies", "berries", "carrots"]
// index: 0 1 2 3
- The first element
"milk"
is at index 0. - The second element
"cookies"
is at index 1. - …and so on.