
Mastering JavaScript Concepts
Quiz
•
Computers
•
10th Grade
•
Practice Problem
•
Hard
IQ SoftTech
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15 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What are the different data types in JavaScript?
undefined, null, boolean, number, string, symbol, object
text, date, binary
array, tuple, set
integer, float, character
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you declare a variable in JavaScript?
You declare a variable using 'define'.
You can only use 'let' to declare variables.
You declare a variable in JavaScript using 'var', 'let', or 'const'.
Variables are declared with 'declare'.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the difference between 'let', 'const', and 'var'?
'var' is function/global scoped, 'let' is block scoped and reassignable, 'const' is block scoped and not reassignable.
'const' is global scoped and reassignable
'var' is block scoped and not reassignable
'let' is function scoped and not reassignable
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Explain the concept of scope in JavaScript.
Scope in JavaScript is determined by the order of variable declarations.
JavaScript has only one type of scope: global scope.
Scope only applies to functions, not variables.
Scope in JavaScript defines the visibility and lifetime of variables and functions, with global and local scopes being the primary types.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a function in JavaScript?
A function is a type of object that cannot be reused.
A function is a variable that holds a single value.
A function in JavaScript is a reusable block of code that can take inputs, execute code, and return a value.
A function is a method to store data in JavaScript.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you define a function in JavaScript?
function:myFunction(param1, param2) => { // function body }
function myFunction(param1, param2) { // function body } or const myFunction = (param1, param2) => { // function body }
myFunction(param1, param2) { // function body }
const myFunction = function(param1, param2) // function body
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the purpose of the 'return' statement in a function?
To define a function's parameters.
To exit a function and return a value to the caller.
To pause the function execution temporarily.
To create a loop within the function.
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