Error
Errors:
Grader Results
Pass | Test | Message | |
---|---|---|---|
- | Test results will show here. | - |
Errors:
10 points
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Karel's Built in Commands
Commands
move(); |
turnLeft(); |
|
putBall(); |
takeBall(); |
Functions
Writing a Function
Writing a function is like teaching karel a new word.
Naming Functions: You can name your functions whatever you want, but you can't have spaces in the function name.
Remember that each open bracket { must match with a close bracket }
function turnRight() { turnLeft(); turnLeft(); turnLeft(); } function turnAround() { turnLeft(); turnLeft(); } function yourFunctionName() { // Code that will run when you make a call to // this function. }
Conditional Statements
If Statements
Remember that each open bracket { must match with a close bracket }if (condition) { // code that will run if the condition is true }
if (condition) { // code that will run if the condition is true } else { // code that will run if condition is not true }
Example of if statements
if (frontIsClear()) { move(); } if (ballsPresent()) { takeBall(); } else { move(); }
Karel Conditions
Don't forget the()
at the end
frontIsClear() leftIsClear() rightIsClear() facingNorth() facingSouth() facingEast() facingWest() ballsPresent() |
frontIsBlocked() leftIsBlocked() rightIsBlocked() notFacingNorth() notFacingSouth() notFacingEast() notFacingWest() noBallsPresent() |
Loops
Remember that each open bracket { must match with a close bracket }While Loops
while (CONDITION) { // Code that will run while the CONDITION is true. // Once the CONDITION is no longer true, // it will stop. }
Example of while loops
/* This moves Karel to a wall */ while (frontIsClear()) { move(); }
For Loops
Note: you can use both "let" and "var" in your for loops (they are two types of JavaScript variables). Use whichever you have been taught in your course.for (let i = 0; i < COUNT; i++) { // Code that will run 'COUNT' times } // Can also use "var" to define the "i" (depends on your course) for (var i = 0; i < COUNT; i++) { // Code that will run 'COUNT' times }
Example of for loops
/* This puts down 10 balls */ for (let i = 0; i < 10; i++) { putBall(); } // Or, if your course teaches "var": for (var i = 0; i < 10; i++) { putBall(); }You can have multiple statements or function calls in a for loop.
/* This puts down five balls and moves after each one */ for (let i = 0; i < 5; i++) { putBall(); move(); } // Or, if your course teaches "var": for (var i = 0; i < 5; i++) { putBall(); move(); }
Use for-loops when you want to repeat something a fixed number of times.
Use while-loops when you want to repeat something as long as a condition is true.
Comments
Comments
/* A multi-line comment describes your code * to someone who is reading it. */ // Use single line comments to clarify code.