3 · Work with collections · 8 MIN

Keep an ordered list

Arrays store values in order, starting at index zero.

A list holds ordered values. Index zero is the first item and len gives the number of items. An out-of-range index raises IndexError. None represents the absence of a value and becomes null in these JSON test results.

A row of numbered lockers starts at locker 0 in JavaScript.

Read the example

names = ["Ada", "Lin", "Grace"]
print(names[0])
print(len(names))

Ada
3

Your challenge

Return the first item of the input list. Return None if the list is empty.

Common trap

Check an empty list before reading index zero.