Error
Errors:
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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.