Programming Readiness Test

All code in this test is JavaScript, which you already know. Read carefully, take your time, and show your thinking. It is okay if you do not finish the bonus question. When you are done, click Download my answers at the bottom and send the file to your teacher.

Section A: Quick Concepts (8 points)

A1. What does a variable do in a program?

It stores a value so you can use it later
It prints text to the screen
It makes the program loop forever
It changes the colour of a webpage

A2. After this code runs, what is the value of score?

let score = 10;
score = score + 5;

A3. In JavaScript, which symbol CHECKS if two values are equal?

A4. What is the position (index) of the FIRST item in an array?

1
0
-1
It depends on the array

A5. True or False: a while loop always repeats an exact number of times that you choose in advance.

True
False

A6. In Scratch, the “repeat 10” block is most like which JavaScript idea?

an if statement
a for loop
a function
a variable

A7. What does return do inside a function?

It prints a value to the screen
It sends a value back to wherever the function was called
It ends the whole program
It restarts the function

A8. In JavaScript, what does "5" + 5 give you?

10
"55"
an error
5

Section B: Trace the Code (20 points)

Write EXACTLY what each program prints, in order. One line of output per console.log.

B1. (2 pts)

let x = 4;
let y = x * 2;
x = x + 1;
console.log(x);
console.log(y);

B2. (2 pts)

let age = 13;
if (age >= 13) {
  console.log("teen");
} else {
  console.log("kid");
}

B3. (3 pts)

let total = 0;
for (let i = 1; i <= 4; i++) {
  total = total + i;
}
console.log(total);

B4. (3 pts)

let count = 0;
while (count < 3) {
  console.log("hi");
  count = count + 1;
}
console.log(count);

B5. (3 pts)

let animals = ["cat", "dog", "bird"];
console.log(animals[1]);
console.log(animals.length);

B6. (4 pts)

for (let i = 1; i <= 3; i++) {
  for (let j = 1; j <= 2; j++) {
    console.log(i + "-" + j);
  }
}

B7. (3 pts)

function double(n) {
  return n * 2;
}
let result = double(3) + double(5);
console.log(result);

Section C: Spot the Bug (9 points)

Each program has ONE bug. Describe what is wrong and how you would fix it. 3 points each.

C1. This should print “Welcome!” only when the password is correct, but it prints it no matter what.

let password = "cat";
if (password = "dragon") {
  console.log("Welcome!");
}

C2. This game should end when you run out of lives, but it never stops running.

let lives = 3;
while (lives > 0) {
  console.log("Playing...");
}

C3. This should print the LAST colour in the list, but it prints undefined.

let colors = ["red", "green", "blue"];
console.log(colors[3]);

Section D: Write Some Code (9 points + bonus)

You can write JavaScript or clear pseudocode (plain English steps). Small syntax mistakes are okay if the logic is right.

D1. Write a loop that prints the numbers 1 to 10, one per line. (4 pts)

D2. Write a function called greet that takes a name and RETURNS (not prints) the text “Hello, NAME!”. For example, greet("Sam") should return “Hello, Sam!”. (5 pts)

BONUS. Write a function called isEven that takes a number and returns true if it is even and false if it is odd. Hint: n % 2 gives the remainder when n is divided by 2. (3 pts)