JavaScript and Python Flashcard Challenge

Front

What is the data type of `null` in JavaScript?

Back

Object

Front

Which of the following is a mutable data type in Python? Tuple, String, List, Integer

Back

List

Front

What is the output of the following JavaScript code?
```javascript
console.log(typeof 42);
```

Back

"number"

Front

Which Python control structure is used to iterate over a sequence?

Back

For loop

Front

What is the purpose of the `return` statement in a JavaScript function?

Back

To exit a function and return a value

Front

Which of the following is a valid list comprehension in Python to create a list of squares of numbers from 0 to 4?
Options:
`[x^2 for x in range(5)]`,
`[x**2 for x in range(5)]`,
`[x*2 for x in range(5)]`,
`[x**2 for x in range(1,5)]`

Back

`[x**2 for x in range(5)]`

Front

What will be the output of the following JavaScript code?
```javascript
function greet() {
return "Hello, World!";
}
console.log(greet());
```

Back

Hello, World!

Front

In Python, what will be the output of the following code?
```python
for i in range(3):
if i == 1:
continue
print(i)
```

Back

0 2

Front

Which of the following is a correct way to define a function in JavaScript? Options: `function myFunction() {}` , `def myFunction() {}` , `function: myFunction() {}` , `myFunction() => {}`

Back

`function myFunction() {}`

Front

What is the result of the following Python list comprehension?
```python
[x for x in range(5) if x % 2 == 0]
```

Back

[0, 2, 4]