ICS2O1 Strand 2 App Inventor
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| App Inventor Development Cycle Steps | 1. Design/Redesign
2. Create UI
3. Code blocks
4. Test/Debug
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| An event | Doing something in the app such as clicking on a button for example.
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| An action | A result of the event happening (i.e. press the button (the event) and display a graphic (the action)).
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| IPO | Input, Processing, Output
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| Input | An input is information that must be received by the app once it starts.
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| Processing | Processing is the action the app must perform to obtain the desired result.
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| Output | An output is the information that the app must provide to the user.
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| Virtual Machine | A recreation of an environment (say the Andriod phone) in another computing environment (say the PC).
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| Algorithm | A list of steps written in English that the program will have to perform.
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| Bug | An error which stops your code working as expected.
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| Syntax error | The rules of the language have been broken, e.g. by mis-spelling a command.
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| Logic error | This means your code runs, but doesn't do what you expect.
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| Debugging | Finding and fixing the errors in a program.
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| Rubber Duckie | The process of talking about what your code SHOULD do while comparing it to what it ACTUALLY does. Note, you don't need a real rubber duckie to do this!
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| Variable | A space in a computer's memory where we can hold information used by our program
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| Number variable | Can contain whole numbers or decimal numbers
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| String variable | Can contain text, characters, or numbers but surrounded by " ".
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| Boolean variable | Can contain either true or false.
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| Mathematic operators | Perform a calculation. Found in the Math blocks. Examples: add, subtract, multiply, divide, and exponents.
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| Joining strings | Can be done with the join block (see ai2 codes)
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| Sprite | A 2D image inserted into a larger screen.
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| Procedure | Very useful in coding. Eliminates repetitive codes. Lets us break a problem down into smaller problems and solve each one separately.
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| If Block | Found under Controls. Allows for one branch. Here's how it works:
If <condition is true>
then do some sort of action (code)
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| Condition | A statement that results in either two outcomes (true or false, yes or no, 1 or zero).
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| Conditional Blocks | Code blocks that make comparisons - result in a true or false result (Boolean value). Found in Math blocks:
Ex: 3 = 3 TRUE
Ex: 2 > 10 FALSE
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| IF ELSE Block | 2 way branching. 1 branch is for if the condition is true and the other is for if it is false
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| If - Else if - Else ladder | App inventor checks the 1st if Statement and then the else ifStatement if it has to. Finally it will Check the Else statement if The other two are not true!
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| Compound Conditions - AND & OR | Used to check if two or more conditions have been met
Example: To get to level 2 the user must kill the boss AND have 100 gold
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| Counted Repetition (For Statement) | Used to repeat blocks of code N amount of times.
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| Conditional Loop | A conditional loop is used when we don't know in advance how often a process will have to be repeated.
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| List | A collection of related data (i.e. high scores) stored to a variable.
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| List index | The position of an element in a list The first spot is index 1, the second spot is index 2, etc.
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To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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Created by:
ethan-seekum
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