Comp Sci Unit 3.b

A school is developing a program to keep track of information about students and their class schedules. In which of the following instances would a data abstraction be most helpful?

• The program includes individual variables to store the names of each student rather than a single list of students.

• A program includes multiple comments that could be combined into a single comment

• A program includes repeated programming statements that could be moved inside a loop

• A program includes repeated code that could be moved inside a function.

var list = [10, 5, 15]; for(var i = 0; <INSERT CODE>; i++){ console.log(list[i]); }

Which of the following will result in ONLY all the items in list being printed to the console if placed where the program reads <INSERT CODE> and the program is run?

• i < list[list.length]

• i < list.length

• i < list[0]

• i < list[1]

wordList is a list of words that currently contains the values ["tree", "rock", "air"]

Which of the following lines will result in the list containing the values ["air", "rock", "air"]

• wordList[0] = wordList[2]

• wordList[2] = wordList[0]

• insertItem(wordList, 0, "air")

• removeItem(wordList,0)

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

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

• 2

• 3

• 20

• 30

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)

• 3

• 6

• 7

• 5

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

var count = 0 while (count != 5){ console.log(count); count = count + 2; }

• 0 2 4 6

• 0 2 4

• 2 4 6

• The program will result in an infinite loop

What will the following program display in the console?

for(var i = 0; i < 4; i++){ console.log(i); }

• 0 1 2 3

• 0 1 2 3 4

• 1 2 3

• 1 2 3 4

What will the following program display in the console?

var sum = 0; for(var i = 0; i < 5; i++){ sum = sum + i; } console.log(sum);

• 0

• 5

• 10

• 15

The following question uses a robot in a grid of squares. The robot is represented by a triangle, which is initially facing up.

Which of the following programs will move the robot to the gray square following the path shown on the grid?

NOT ACTUAL ANSWERS< JUST THE FIRST TWO LINES!!!!!!!!!!!!!!!!!!!!!!!!

• Repeat 2 times

  Repeat 3 times

• Repeat 3 times

  Repeat 2 times

• Repeat 2 times

  Repeat 2 times

• Repeat 3 times

  Repeat 3 times

ages and names contain information about students in a classroom. A programmer has already written the following code with that information.

var ages = [16,17,18, 17]; var names = [“Beni”, “Analise”, “Ricardo”, “Tanya”]; var filteredNames = []; var age;

Which of the following programs will result in filteredNames only containing the names of students who are 17 or older?

• if(age < 17){

  appendItem(filteredNames, age)

  }

  }

• if(age < 17){

  appendItem(filteredNames, names[i])

  }

  }

• if(age >= 17){

  appendItem(filteredNames, age)

  }

  }

• if(age >= 17){

  appendItem(filteredNames, names[i])

  }

  }