Unit 3: Lesson 5: Variables Flashcard

Front

What is a variable in programming?

Back

A symbol or name that holds a value.

Front

Which of the following is an example of declaring a variable in JavaScript? Options: `var score = 10;`, `print(score);`, `if (score > 10)`, `function score()`

Back

`var score = 10;`

Front

Explain why variables are important in creating interactive animations and games.

Back

They allow for the storage and manipulation of data, enabling dynamic changes in the game.

Front

How would you use a variable to keep track of a player's score in a game?

Back

By declaring a variable and updating its value whenever the player scores

Front

Given the following code snippet, what will be the output?
```javascript
var x = 5;
x = x + 3;
console.log(x);
```

Back

8

Front

Design a simple algorithm using variables to determine if a number is even or odd. Options: Use a loop to check each digit of the number, Use a variable to store the number and check if the remainder when divided by 2 is zero, Use a function to multiply the number by 2, Use a variable to store the number and check if it is greater than 10

Back

Use a variable to store the number and check if the remainder when divided by 2 is zero

Front

In a game, you want to increase the difficulty level as the player progresses. How can variables help achieve this?

Back

By storing the player's progress and using it to adjust the difficulty level

Front

What is the result of the following operation if `var y = 10;` and `y = y * 2;`?

Back

20

Front

How can you use variables to create a countdown timer in a game?

Back

By using a variable to store the initial time and decrementing it at regular intervals

Front

Consider a game where a character collects coins. How would you use a variable to keep track of the number of coins collected?

Back

By using a variable to store the total number of coins and incrementing it each time a coin is collected