JavaScript practice path

Make your first 12 problems count.

Twelve problems, one ordered path

Free to practice · Browser-run verdicts · Saved code with an account

Problem 01 · Sum two numbersAccepted

function solve(input) {const [a, b] = input.trim().split(" ").map(Number);return String(a + b);}

Deterministic checks4 of 4 passed

A 12-problem first streak

Practice the basics in a useful order.

Each problem isolates one beginner skill, so you can see exactly what passed and move to the next unfinished challenge.

Sum two numbersInput handling

Beginner

Even or oddConditions

Beginner

Multiplication tableLoops

Beginner

Largest valueArrays

Beginner

Reverse a wordStrings

Beginner

FizzBuzz sequenceSimple algorithms

Beginner

Count vowelsString traversal

Beginner

Keep unique valuesSets

Beginner

Balanced bracketsStacks

Intermediate

First unique characterFrequency maps

Intermediate

Binary search indexBinary search

Intermediate

Maximum window sumSliding windows

Intermediate