Javascript Arrays

An array is;

• A shape

• A size

• A series of numbers

• A list of information

Answer explanation

Arrays can store many types of information. Not just numbers.

What is first index value of an array?

• -1

• 0

• 1

• undefine

In Javascript, what surrounds an array?

• Quotations

• Curly Brackets

• Parenthesis

• Square Brackets

Answer explanation

Other languages often use the {} to contain an array of information.

array = [1,2,3,4,5]
What is the length of this array?

• 5
• 4
• 0
• 125.4

Which definition below best describe an array?

• An array is a function identifier that can hold more than one parameter.

• An array is a beam of light.

• An array is a special variable, which can hold more than one value at a time.

• An array is a special function, which can hold more than one value at a time.

What is proper syntax for declaring a array in JavaScript?

• var arrayName =[ ];

• var arrayName[ ] ={ };

• array arrayName ={ };

• obj var arrayName =[ ];

Which of the variables below is an array?

• var names="array"

• var names = array;

• var names = [];

• var names[];

How would you change the first element in an array?

• nums[1] = "New!";
• nums = "New!";
• var nums[1] = "New!";
• nums[0] = "New!";

array = [1,2,3,4,5];
What is the highest position in this array?
HINT: Remember arrays start at position 0!

• 4
• 5
• 0
• 125.7

What property tells you how many items are in an array?

• length
• count
• items
• num