1. CSCI 105 – Computer Fluency, Spring 2015
JavaScript Review
CSCI 105 – Computer Fluency, Spring 2015

2. ALGORITHMS and FLOWCHARTS
A typical programming task can be divided into two phases:
Problem solving phase
produce an ordered sequence of steps that describe a solution to the problem
this sequence of steps is called an algorithm
Create a flowchart to document the program flow and logic
Implementation phase
implement the program in some programming language

3. Example Step 1: Input M1,M2,M3,M4 Step 2: GRADE  (M1+M2+M3+M4)/4
START
Input
M1,M2,M3,M4
GRADE(M1+M2+M3+M4)/4 IS
GRADE < 50
PRINT
“FAIL”
STOP Y N
Step 1: Input M1,M2,M3,M4
Step 2: GRADE  (M1+M2+M3+M4)/4
Step 3: if (GRADE < 50) then
Print “FAIL”
else
Print “PASS”
endif
PRINT
“PASS”

4. Knowledge –Terms and Concepts
1. Variables – hold a value, value can be numeric, text, true/false
Declared at beginning of program and inside functions
var dog; /* declared but undefined */
var dog = “Rover”; /* defined variable with initial assignment of a value */
Scope of variables: Global vs. Local
2. Expressions – evaluate to values, value can be numeric, text, true/false
can be assignment such as dog = “Rover”;
Math related such as total = price – (price * (discount / 100));
Text related such as salutation = “Dear “ + firstName + “,”;
or conditional using if (dog == “rover”)
And Logical (true/false) such as age < 14 or cost >=3.99

5. Knowledge – Program Flow
1. Top to Bottom
2. Loops repeat a section of code until a condition is met
while (scoops > 0) { eatmore = “yes”; scoops = scoops -1; }
3. Functions are small routines that are called to accomplish a task and may or may not return a value
function barkAtTheMoon( ) { bark = “Wooooooooooooooo”; alert (bark); }

6. Comprehension - Programming Method
Algorithm Flowchart
(identifies the inputs, processes, and outputs)
Implementation in a Programming language
Variable declaration
Code that accomplishes the algorithm
Output the results

7. Battleship – Review (open in editor)

8. Rock Paper Scissors Game

9. Code – Rock-Paper-Scissors
var userChoice; var computerChoice;
computerChoice = Math.random( ); /* this function returns a random value between 0 and 1 */
if (computerChoice >0 && computerChoice <= 0.34) { computerChoice = "rock"; } if (computerChoice >= 0.35 && computerChoice <= 0.67) { computerChoice = "paper"; } if (computerChoice >= 0.68 && computerChoice <= 0.99) { computerChoice = "scissors"; }
userChoice = prompt("Do you choose rock, paper or scissors?");

10. Code – Rock-Paper-Scissors (better)
var userChoice = prompt("Do you choose rock, paper or scissors?");
var computerChoice = Math.random( );
if (computerChoice < 0.34) {
computerChoice = "rock";
} else if(computerChoice <= 0.67) {
computerChoice = "paper";
} else { computerChoice = "scissors"; }