WorksheetsIntro to JS: Functions, Scope & Objects
Total questions: 8
Worksheet time: 9mins
What is the keyword used to define a function in JavaScript?
define
function
method
procedure
In the context of JavaScript, what does the term "scope" refer to?
The number of lines in a function
The accessibility of variables and functions in different parts of the code
The speed at which a function executes
The size of the code block
Given the function definition `function add(a, b) { return a + b; }`, what will `add(3, 4)` return?
34
7
12
undefined
Consider the following code snippet: ```javascript var color = 'blue'; function changeColor() { var color = 'yellow'; console.log(color); } changeColor(); console.log(color); ``` What will be logged to the console?
yellow, blue
blue, yellow
yellow, yellow
blue, blue
What will be the output of the following code? ```javascript var myDog = { name: 'Buddy', age: 5 }; delete myDog.age; console.log(myDog.age); ```
5
undefined
null
Error
Analyze the following code and determine what it does: ```javascript function multiplyByTwo(n) { return n * 2; } var result = multiplyByTwo(4); console.log(result); ```
It multiplies 4 by 2 and logs 8
It adds 2 to 4 and logs 6
It divides 4 by 2 and logs 2
It logs an error
Given the object `var car = { brand: 'Toyota', model: 'Corolla' };`, how can you check if the property `model` exists in the object?
car.hasOwnProperty('model')
'model' in car
Both A and B
Neither A nor B
When defining a function, the definition must occur before it is called.
true
false
