
Mastering JavaScript Basics
Authored by MOzY MOzY
Computers
University
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16 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What method would you use to create a new array with elements that pass a test?
Use the 'map' method.
Use the 'filter' method.
Use the 'forEach' method.
Use the 'reduce' method.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you combine all elements of an array into a single value?
Use array.concat() to merge arrays.
Use array.reduce() in JavaScript or a similar folding function in other languages.
Utilize array.filter() to select specific items.
Apply array.map() to transform elements.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the purpose of the rest parameter in a function?
The rest parameter is used to define default values for function parameters.
The purpose of the rest parameter is to collect all remaining arguments into an array.
The rest parameter limits the number of arguments a function can accept.
The rest parameter is a way to create named parameters in a function.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How does the spread operator work in JavaScript?
The spread operator combines multiple objects into one.
The spread operator is used to create a new array from an existing one.
The spread operator in JavaScript expands elements of an iterable into individual elements.
The spread operator is a method for defining functions in JavaScript.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is variable scope and why is it important?
Variable scope is the method of defining variable types in a programming language.
Variable scope refers to the physical location of a variable in memory.
Variable scope is the context in which a variable is accessible in a program, and it is important for managing variable visibility, memory usage, and preventing conflicts.
Variable scope is the process of encrypting variable data for security.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you declare a 2D array in JavaScript?
let array2D = [1, 2, 3, 4];
let array2D = {1: [2, 3], 4: [5, 6]};
let array2D = new Array(2, 2);
let array2D = [[1, 2], [3, 4]];
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which method would you use to find the length of a string?
Use the 'length' property or function.
Use the 'size' method.
Count the number of characters manually.
Apply the 'getLength()' function.
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