CodeHS Unit 7 Review

We want to make a grocery list in our program. Which of the following is the correct way to make an array/list?

• var groceries = ["milk" "sugar" "eggs" "cake"];

• var groceries = ["milk, sugar, eggs, cake"];

• var groceries = "milk, sugar, eggs, cake";

• var groceries = ["milk", "sugar", "eggs", "cake"];

What method can we use to find the index of a particular element in an array?

• .index

• indexOf

• inIt

• findElement

The index of the very first item in an array is 1.

• true

• false

var numbers = [0, 1, 2, 3, 4];

How can we add a 6 to the end of numbers?

• pop(6)

• push(6)

• add(5,6)

• pop( )

What is an array ?

• An unordered collection of items

• An ordered collection of items

• A collection of (key, value) pairs

• A collection of unique objects that are not in a specific order

What is the output of the following program?

 

function start(){

 

   var arr = [1, 2, 3, 4, 5, 6, 7];

 

   var elem = arr.remove(2);

 

   println(arr);

 

}

• [1, 2, 3, 4, 5]

• [3, 4, 5, 6, 7]

• [1, 2, 4, 5, 6, 7]

• [1, 3, 4, 5, 6, 7]

var numbers = [ 1, 2, 3, 4, 5, 6];

How can we remove the last item from the end of this array and store it in a variable called highestNum?

• var highestNum = numbers.pop();

• var numbers =

  highestNum.push(6);

• var highestNum = numbers[5];

• var numbers = numbers.pop();

var shoppingList = ["milk", "eggs", "sugar", "bread", "cake"];

Which line of code will correctly change "cake" to "apples"?

• shoppingList["apples"] = "cake";

• shoppingList[5] = "apples";

• shoppingList["cake"] = "apples";

• shoppingList[4] = "apples";

What is the index of the first element in an array?

• 1

• -1

• 2

• 0