Practise JavaScript variables, numbers, strings, conditions and loops with small programs. Every solution has been run with Node.js and shows its real output.
Review first: Variables: let, const and var, Numbers and Math, Strings and Template Literals, if, else and Ternary, Loops: for, while, do...while
A dinner costs ₹1,850 and 4 friends split it equally. Print each share with exactly two decimal places, like Each person pays ₹462.50.
Divide, then format with toFixed(2) inside a template literal.
const total = 1850;
const people = 4;
console.log(`Each person pays ₹${(total / people).toFixed(2)}`);Each person pays ₹462.50A film lasts 135 minutes. Print it as 2 h 15 min.
Math.floor(minutes / 60) gives the hours; % gives the remaining minutes.
const minutes = 135;
const hours = Math.floor(minutes / 60);
console.log(`${hours} h ${minutes % 60} min`);2 h 15 minGiven const fullName = " asha devi rao ", print the initials in capitals with full stops: A.D.R.
trim(), then split(" "), take the first character of each word and toUpperCase().
const fullName = " asha devi rao ";
const initials = fullName
.trim()
.split(" ")
.map((word) => word[0].toUpperCase() + ".")
.join("");
console.log(initials);A.D.R.Write a function grade(marks) that returns "A" for 90 and above, "B" for 75 to 89, "C" for 50 to 74 and "Fail" below 50. Print the grades for 95, 75, 60 and 42.
Check the highest range first with if and return.
function grade(marks) {
if (marks >= 90) return "A";
if (marks >= 75) return "B";
if (marks >= 50) return "C";
return "Fail";
}
console.log([95, 75, 60, 42].map(grade).join(" "));A B C FailPrint the numbers from 1 to 15 on one line, but print "Fizz" for multiples of 3, "Buzz" for multiples of 5, and "FizzBuzz" for multiples of both.
Check % 15 first, then % 3 and % 5. Collect the results in an array and join(" ").
const out = [];
for (let n = 1; n <= 15; n++) {
if (n % 15 === 0) out.push("FizzBuzz");
else if (n % 3 === 0) out.push("Fizz");
else if (n % 5 === 0) out.push("Buzz");
else out.push(n);
}
console.log(out.join(" "));1 2 Fizz 4 Buzz Fizz 7 8 Fizz Buzz 11 Fizz 13 14 FizzBuzzPrint the sum of the digits of 49152 using a while loop with % and division (no strings).
n % 10 is the last digit; Math.floor(n / 10) removes it.
let n = 49152;
let sum = 0;
while (n > 0) {
sum += n % 10;
n = Math.floor(n / 10);
}
console.log(sum);21Count the vowels (a, e, i, o, u, in any case) in "JavaScript Is Fun" using a for...of loop.
"aeiou".includes(ch.toLowerCase()) checks one character.
let count = 0;
for (const ch of "JavaScript Is Fun") {
if ("aeiou".includes(ch.toLowerCase())) count++;
}
console.log(count);5