JavaScript Control Structures Test

What is the proper operator for "not equals" in JavaScript? =! != ~= NOT EQUALS

!=

What symbol represents the and operator in JavaScript? AND and & &&

&&

How can we check if a variable num is even? num.isEven() will be true (num % 2 == 0) will be true (num % 2 == 0) will be false (num / 2 == 0) will be true

(num % 2 == 0) will be true

How many times will this program print "hello"? var i = 10; while (i > 0) { println("hello"); i--; } 0 10 i This code will loop infinitely

10

What will be the value of sum after this code runs? var START = 1; var END = 4; function start(){ var sum = 0; for(var i = START; i <= END; i++){ sum += i; } } 10 4 1 40

10

In the following code, what will be the last number to print to the screen before the program finishes? for (var i = 0; i < 10; i++) { if (i % 2 == 0) { println(i); } else { println(2 * i); } } 10 20 9 18

18

How many possible values can Randomizer.nextBoolean() return? 0 1 2 3

2

How many times will the following code print "hello"? for (var i = 0; i < 8; i += 2) { println("hello"); } 0 2 4 8

4

How many times will the following code print "hello"? for (var i = 3; i < 8; i++) { println("hello"); } 3 5 6 8

5

How many times will the following program print "hello"? for (var i = 0; i < 5; i++) { println("hello"); } 4 5 6 i

5

What is the proper way to compare if two values are equal in a boolean expression in JavaScript? = == EQUALS is

==

Why do we use constant variables? To avoid having "magic numbers" in our code To give values a readable name, so that their purpose is clear To let us easily change the behavior of our program by only having to change a value in one place All of the above

All of the above

Which of the following returns a random number between 1 and 10? randomInt(1, 10) randInt(1, 10) Randomizer.int(1, 10) Randomizer.nextInt(1, 10)

Randomizer.nextInt(1, 10)

How many times will this program print "hello"? var i = 50; while (i < 100) { println("hello"); } 0 50 100 This code will loop infinitely

This code will loop infinitely

After the following code runs, what is the value of isWeekend? var isSaturday = true; var isSunday = false; var isWeekend = isSaturday || isSunday; true false "isWeekend" "isSaturday || isSunday"

True

Which of the following is not a valid value for a boolean? True False Yes The above are all valid

Yes

What statement can we use inside of a loop to end it? println break for else

break

What kind of statement allows us to run a block code only if a certain condition is true? if statement break statement else statement for loop

if statement

What kind of statement allows us to run one block of code if one condition is true, and a separate block of code otherwise? if statement break statement if/else statement for loop

if/else statement

What is the term for the value that signals the end of user input? sentinel break -1 done

sentinel

Which of the following is a good example of a proper constant variable name? var max_value = 100; var MAX_VALUE = 100; var Max_Value = 100; var maxValue = 100;

var MAX_VALUE = 100;

Which of the following is correct loop and a half structure? while(condition){ //code } for(var i = 0; i <= 1.5; i++){ //code } while(true){ //code if(condition){ break; } //code } for(var i = 0; i < 2; i++){ //code break; //code }

while(true){ //code if(condition){ break; } //code }

What symbol represents the or operator in JavaScript? OR or | ||

||