cn-sensei-guides/01-white/04-01-cocunut-chaos.js

/**
Ninjas use conditionals and if statements to move an object when a key is pressed.

New Vocabulary and Concepts
* GDP isKeyPressed() function
* GDP Keys Object

Reinforced Vocabulary and Concepts
* Boolean Logic
* Comparison Operators
* Functions and Parameters
* GPD moveX() Function
* if() Statements
* Object Names
* Pseudocode

Sensei Notes
* This game takes the concepts learned in 03-02 and 03-03 and applies them to 
keyboard inputs.
* This activity introduces isKeyPressed() and the Keys object.
* The steps in section 4 are denser than the previous 3 sections. If a Ninja is 
getting overwhelmed with how much they need to do at each step, help them break 
the step down into smaller and more manageable pieces.

Solution Steps
1 Make sure the Ninja opens the correct scene.
2 The Ninja should play the game to see what functionality needs to be added. 
They should write down the provided pseudocode so they can reference it when they 
write their own.
3 The Ninja should attempt to write their own pseudocode and then compare it to 
the provided pseudocode.
4 Make sure the Ninja has correct pseudocode before they code in the GDP.
    if(){

    }
5 Make sure the Ninja places the function call inside the if statement's 
parentheses. Explain that the GDP uses the isKeyPressed() function to communicate 
when a key is being pressed by the user. Explain that the Keys object is an easy 
way to ask the isKeyPressed function about a specific key on the keyboard.
    if(isKeyPressed(Keys.rightArrow)){

    }
6 Make sure the Ninja types the new line of code inside the body of the if 
statement. The name of the GDP object is ninjas and 300 is a good starting move 
speed.
    if(isKeyPressed(Keys.rightArrow)){
        moveX(ninjas, 300);
    }
7 Have the Ninja play the game to verify that their code is working. They can 
change the speed to whatever they think is best.
8 Make sure the Ninja types the new if statement after the first one.
    if(){

    }
9 Make sure the Ninja places the function call inside the if statement's 
parentheses.
    if(isKeyPressed(Keys.leftArrow)){

    }
10 Make sure the Ninja types the new line of code inside the body of the if 
statement. If they changed the speed of the first if statement, make sure they 
have the negative version of their speed in this if statement.
    if(isKeyPressed(Keys.leftArrow)){
        moveX(ninjas, -300);
    }
11 Let the Ninja play the game that they built. Encourage them to playtest it to 
find the best move speed values.
12 Before the Ninja submits the game, verify that their code is correct.
*/

if(isKeyPressed(Keys.rightArrow)){
    moveX(ninjas, 300);
}

if(isKeyPressed(Keys.leftArrow)){
    moveX(ninjas, -300);
}

/**
Sensei Stops
5 Tell a Sensei if isKeyPressed(Keys.rightArrow) returns true of false when the 
right arrow key is pressed. How about if the space bar is pressed?
The Ninja should be able to understand that the function will return true if and 
only if the right arrow key is being pressed. Make sure they understand that the 
body of the if statement will run only if the condition evaluates to true.
10 Tell a Sensei how you used your pseudocode to understand the GDP code. Why did 
we use a negative speed in the second if statement?
The Ninja should be able to connect the pseudocode they wrote to the code they 
typed. If they do not understand, then walk through each of the pseudocode and 
how it translates to JavaScript code. The Ninja should be able to state that a 
negative x speed moves an object to the left.
 */