js arrays Flashcards
1
Q
What are arrays used for?
A
storing data in a specific order, lists
2
Q
Describe array literal notation.
A
var array = [indexZero, indexOne, indexTwo];
3
Q
How are arrays different from “plain” objects?
A
data is stored in order in arrays, objects have no order. Objects have key/value pairs, arrays store values without keys. Arrays are numerically indexed
4
Q
What number represents the first index of an array?
A
0
5
Q
What is the length property of an array?
A
the number of items in the array
6
Q
How do you calculate the last index of an array?
A
array.length - 1
