Q
What does the following JavaScript code snippet do? Code: let numbers = [1, 2, 3, 4, 5]; let product = numbers.reduce((total, num) => total * num, 1); console.log(product);

Answer & Solution

Answer: Option C
Solution:
The code snippet calculates the product of all numbers in the array numbers using the reduce method. The reduce method takes a callback function as an argument, which receives two parameters (total and num). It starts with an initial value of 1 and multiplies each number from the array numbers with the total in each iteration. After iterating through all elements, it returns the final product, which is then logged to the console. In this case, the product of elements 1 * 2 * 3 * 4 * 5 = 120, which is the output of the code.
Related Questions on Average

What does the following JavaScript code snippet do? Code: let x = 'Hello'; let y = x.length; console.log(y);

A). A) Stores the length of the string x in y

B). B) Converts x to uppercase

C). C) Converts x to lowercase

D). D) Finds the index of a character in x

What will be the output of the following JavaScript code? Code: let x = 45; if (x % 2 === 0) { console.log('Even'); } else { console.log('Odd'); }

A). A) Even

B). B) Odd

C). C) 45

D). D) None of the above

What will be the output of the following JavaScript code? Code: let x = 40; if (x % 2 === 0) { console.log('Even'); } else { console.log('Odd'); }

A). A) Even

B). B) Odd

C). C) 40

D). D) None of the above

What does the following JavaScript code snippet do? Code: let numbers = [1, 2, 3, 4, 5]; let sum = numbers.reduce((total, num) => total + num, 0); console.log(sum);

A). A) Finds the maximum number in numbers

B). B) Calculates the average of numbers in numbers

C). C) Sums all numbers in numbers

D). D) Checks if all numbers in numbers are even

What will be the output of the following JavaScript code? Code: console.log(typeof null);

A). A) Object

B). B) Null

C). C) Undefined

D). D) String

What will be the output of the following JavaScript code? Code: console.log('20' - 10);

A). A) 10

B). B) 30

C). C) '2010'

D). D) NaN

What does the following JavaScript code snippet do? Code: let x = 'Hello'; console.log(x.toUpperCase());

A). A) Converts x to lowercase

B). B) Reverses the characters in x

C). C) Converts x to uppercase

D). D) Adds spaces to x

What will be the output of the following JavaScript code? Code: console.log(2 + 2 + '2');

A). A) 42

B). B) 22

C). C) 4'2'

D). D) '22'

What will be the output of the following JavaScript code? Code: let x = 30; if (x % 2 === 0) { console.log('Even'); } else { console.log('Odd'); }

A). A) Even

B). B) Odd

C). C) 30

D). D) None of the above

What does the following JavaScript code snippet do? Code: let names = ['Alice', 'Bob', 'Charlie']; let message = 'Names: ' + names.join(', '); console.log(message);

A). A) Adds names to an array

B). B) Joins names from an array into a single string

C). C) Splits names into an array

D). D) Reverses the order of names in an array