Assessment - Unit 3 lessons 9-15

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Name(s) Period Date Assessment - Unit 3 lessons 9-15 1. Which of the following is FALSE about event driven programs? a. An event driven program cannot implement an algorithm. b.

1 Name(s) Period Date Assessment - Unit 3 lessons Which of the following is FALSE about event driven programs? a. An event driven program cannot implement an algorithm. b. Some portions of an event driven program may never execute while the program is running. c. An event driven program is written to respond to specified events by executing a block of code or function associated with the event. d. The order in which an event driven program will run cannot always be known ahead of time. e. Event driven programs can be run multiple times with different outcomes, based on user interactions. 2. Which of the following is FALSE about element IDs? a. An element with a unique ID must always have an event handler associated with it. b. All elements that can have an ID must have a unique ID so that the computer knows how to distinguish between them when onevent is called. c. Two or more onevent calls may reference the same ID. d. While not a requirement, IDs should be meaningful and descriptive. e. IDs allow a programmer to reference interface elements within their code. 3. Which of the following are actions a programmer could take when debugging a segment of code that would most likely lead to finding a problem and fixing it? (choose two) a. Change the names of variables within the program and run the program again. b. Display the value of variables at various points during the program. c. Ask a friend or collaborator to look over the code segment to see if they are able to find any errors. d. Delete the code and re type it to make sure there were no spelling errors and that it was written correctly. 4. Short Response: Two students, Kaleb and Hunter, are arguing in class about an App Lab project. Kaleb states, Huh, a button and an image are basically the same thing!. Hunter replies, That doesn t make any sense at all!. Explain what Kaleb may have meant by that statement.

2 5. Consider the code segment below: var a = 0; var b = 3; var c = 4; a = a+c; b = a+c; c = a+c; What are the values of a, b, and c after this code segment has been run? A a 4 b 4 c 4 B a 4 b 8 c 8 C a 4 b 8 c 12 D a 4 b 8 c 16 E a 0 b 3 c 4 6. Jasmine is writing a shopping app. She has created a variable to keep track of the number of items in the shopping cart. Every time someone clicks the additembutton, she would like the variable to increase by 1. What code should Jasmine insert where it says <missing code> in order for her app to work? a.cart total = 1;

3 b.carttotal + 1; c. carttotal = carttotal +1; d.var carttotal = carttotal + 1; e.var carttotal + 1; 7. Jose is writing a reply function for a text messaging app. He d like to swap the sender and receiver so that the value currently in variable From ends up as the value in To and To ends up in From Before After Which of the following code segments will correctly swap the values as described? a. to = from; b. from = var temp; to = temp; c. var temp = from; to = from; d. var temp = from; to = temp; e. var temp = to; to = temp;

4 8. A programmer wrote an essay for his history class, and realized he has confused the names of Benjamin Franklin and Alexander Graham Bell. Instead of going through the whole paper and changing the names, he used the following incorrect algorithm in an attempt replace every occurrence of Benjamin Franklin with Alexander Graham Bell and vise versa: First, change all occurrences of Benjamin Franklin to apple Then, change all occurrences of apple to Alexander Graham Bell. Then, Change all occurrences of Alexander Graham Bell to Benjamin Franklin. Here is an example of one of the sentences from the paper. Alexander Graham Bell was born 141 years before Benjamin Franklin, so he was never able to telephone his neighbors. Which of the following is the result of running the described incorrect algorithm on the sentence above? a. Benjamin Franklin was born 141 years before Alexander Graham Bell, so he was never able to telephone his neighbors. b. apple was born 141 years before Benjamin Franklin, so he was never able to telephone his neighbors. c. Alexander Graham Bell was born 141 years before apple, so he was never able to telephone his neighbors. d. Benjamin Franklin was born 141 years before Benjamin Franklin, so he was never able to telephone his neighbors. e. Alexander Graham Bell was born 141 years before Alexander Graham Bell, so he was never able to telephone his neighbors.

What is displayed by the console.log statement after the following code segment executes?

5 9. Consider the code segment below: var dist = 100; var radius = dist/20; pendown(); for(var i=0; i < 4; i++){ moveforward(dist); dot(radius); turnright(90); } Which of the following images is the most likely outcome of the drawing? a. b. c. d. 10. What is displayed by the console.log statement after the following code segment executes? 1 var a = 3; 2 var b = 6; 3 var c = 10; 4 a = b / a; 5 b = c a; 6 c = b / a; 7 console.log( value is: +c); a. value is: 2 b. value is: c. value is: 3 d. value is: 4 e. value is: c

6 11. A student decides to draw a series of three dots (sort of like a snowman) as shown in the diagram. She wants each dot to be half the radius of the previous dot, and for the center to be on the edge of the dot below it. She writes the following code segment to do it: 1 var bottom = 100; 2 var middle = 50; 3 var top = 25; 4 5 dot(bottom); 6 moveforward(bottom); 7 8 dot(middle); 9 moveforward(middle); dot(top); She is not sure about the size though, and wants to be able to quickly experiment with the drawing by changing only one number the radius of the bottom dot and for the rest of the code to size and scale the drawing accordingly. How should she adjust lines 2 and 3 of her code to implement this change? a. 2 var middle = 100 / 2; 3 var top = 50 / 2; b. 2 var middle = ; 3 var top = 50 25; c. 2 var middle = bottom / 2 ; 3 var top = middle / 2; d. 2 var middle = bottom 50; 3 var top = middle 25; e. 2 var top = middle / 2; 3 var middle = bottom / 2;

12. Consider the following flow chart showing a process for program execute. Given that a = 5, and b = 10, what will be displayed by the program? a. a b. b c. 5 d. 10 e. Nothing will be displayed 13.

7 12. Consider the following flow chart showing a process for program execute. Given that a = 5, and b = 10, what will be displayed by the program? a. a b. b c. 5 d. 10 e. Nothing will be displayed 13. What is a possible output when the following code segment executes? The ending position of the turtle is shown in each diagram. The starting position is shown as a white triangle in cases where the turtle starts and ends in different locations. a. b. c. d. e.

8 14. What is the output to the console after the following code segment is executed? 1 fivemore(); 2 function fivemore(){ 3 var x = 5 4 } 5 var y = 3 + x; 6 console.log(y); a. 2 b. 3 c. 5 d. 8 e. Error. Unknown Identifier: x 15. What is the output to the console after the following code segment is executed? 1 var x = 10; 2 increase(); 3 x = x+3; 4 console.log(x); 5 function increase(){ 6 var x = 5; 7 } a. 5 b. 8 c. 10 d. 13 e. Error. Cannot make a new variable x inside function increase()

Assessment - Unit 3 lessons 16-21

Name(s) Period Date Assessment - Unit 3 lessons 16-21 1. Which of the following statements about strings in JavaScript is FALSE? a. Strings consist of a sequence of concatenated ASCII characters. b. Strings