Functions Cumulative II - JavaScript Programming

Some questions may take more time to solve as it takes time for any beginner to build logic for approaching such programming problems so don’t get discouraged.

Q1.

Write a JavaScript function that returns array elements larger than a given number.

// for a given set of numbers [1, 5, 23, 16, 54, 39, 41] & given number - 29

// output
result:
54
39
41

Q2.

Write a JavaScript function to extract unique characters from a given string.

// for a given string "abcdabcdefgggh" 

// output
ans - "abcdefgh"

Q3.

Write a JavaScript function that accepts a list of country names as input and returns the longest country name as output.

// for a given set of countries ["Australia", "Germany", "United States of America"]

// output
"United States of America"

Q4.

Write a JavaScript function to count the number of vowels in a given string.

// for a given string "almond"

// output (here a & o are vowels)
2

Q5. (Adv.)

Write a JavaScript function to generate a random number within a given custom range (start, end).

Q6. (Adv.)

Write a program to print all the prime numbers in a given range of numbers.

For e.g. let’s say if user give the first number as 7 and the second number as 43, then program needs to print all the prime numbers between 7 & 43 including 7 & 43.

Expected Output:

Divide your program into separate tasks, in this program we have a main big task where we have to print all the numbers in a given range which are prime. Now first & for most, the important part is to decide whether a number is prime or not, so you can just focus on that part initially. Make a separate function to handle that logic. After you’re done with it, the task is to print prime numbers in a given range, so you have to indirectly check for multiple numbers.