Lists

Match the index with the value.

var myNumbers = [32, 64, 33, 0, 15, 26, 3]

myNumbers[4]

• 64

• 15

• 0

• 33

Answer explanation

The value at index 4 in the array myNumbers is 15, so the correct match is 15.

//Consider this code:

var list = [10, 12, 14, 16, 18];

appendItem(list, 3);

insertItem(list, 2, 20);

removeItem(list, 0);

//What is printed to the console?

console.log(list);

• 10, 12, 14, 16, 18

• 3, 12, 14, 20, 16, 18

• 10, 12, 14 , 20, 16, 18, 3

• 12, 20, 14, 16, 18, 3

Answer explanation

The code appends 3 to the end of the list, inserts 20 at index 2, and then removes the item at index 0. So, the correct answer is 12, 20, 14, 16, 18, 3.

//Consider this code:

var list = [10, 12, 14, 16, 18];

appendItem(list, 3);

insertItem(list, 2, 20);

removeItem(list, 0);

//What is printed to the console?

console.log(list[0]);

//Consider this code:

var list = [10, 12, 14, 16, 18];

appendItem(list, 3);

insertItem(list, 2, 20);

removeItem(list, 0);

//What is printed to the console?

console.log(list.length);

//Consider this code:

var list = [10, 12, 14, 16, 18];

appendItem(list, 3);

insertItem(list, 2, 20);

removeItem(list, 0);

//What is printed to the console?

console.log(list[list.length-1]);

//Consider this code.

var listOne = [2, 1, 0];

var listTwo = [1, 2, 0];

var a = listTwo[listOne[0]];

var b = 3 - a;

//What is printed to the console?

console.log(b);

• 0

• 2

• -1

• 1

• 3

Answer explanation

The value of a is 0, so b = 3 - 0 = 3. Therefore, the printed value to the console is 3.

//Consider this code.

var listOne = [2, 1, 0];

var listTwo = [1, 2, 0];

//What is printed to the console?

console.log( listOne[1] + listTwo[1] );

• 0

• 2

• 4

• 1

• 3

Answer explanation

The code prints the sum of the values at index 1 of listOne and listTwo, which is 3.

What is the result of this program?

00 var myStuff = [20, "hat", "pow", 5];
01 myStuff[1] = "cat";
02 myStuff[2] = myStuff[1];
03 myStuff[0] = myStuff[3] + 10;
04 myStuff[3] = myStuff[0] + myStuff[0];

myStuff = [____________]

What will be displayed in the console when this program runs?

var numList = [10,20,30];
console.log(numList[numList.length-1]);

What will be displayed when this program finishes running?

var numbersList = [20, 10, 5]
appendItem(numbersList, 50)
appendItem(numbersList,100)
removeItem(numbersList,1)
insertItem(numbersList, 0, 30)

console.log(numbersList.length)