~mostafa_al_mahmud

Basic 10 JavaScript Problem-Solving Exercises Developers Should Practice

Ten foundational JavaScript practice patterns for arrays, strings, loops, recursion, and number logic.

Updated Nov 04, 2020#javascript#problem-solving#es6#algorithms
JavaScript problem-solving practice cover image

Prime number check

const isPrime = (num) => {
  if (num <= 1) return false;
  for (let i = 2; i * i <= num; i++) {
    if (num % i === 0) return false;
  }
  return true;
};

A compact example of loop + condition reasoning from basic practice sets.

Original publication

This post is adapted from the original Medium article: Basic 10 Problems Solving With JavaScript That should JavaScript Developer Practice

Practice set overview

The exercise list spans core patterns that appear repeatedly in interviews and real coding tasks:

  1. Largest element in an array.
  2. Sum of array values.
  3. Duplicate removal.
  4. Word counting.
  5. String reversal.
  6. Factorial with loop.
  7. Factorial with while loop.
  8. Recursive factorial.
  9. Fibonacci series.
  10. Prime number checks.

Why these basics still matter

These exercises build fluency with loops, conditions, indexing, mutability, and edge-case handling. That fluency compounds when solving larger production problems.

How to practice effectively

  • Solve each problem in at least two ways.
  • Add boundary tests (0, negative numbers, empty arrays).
  • Compare readability versus micro-optimizations.
  • Refactor repeated logic into small utility functions.

Read more

For original snippets and explanations, read the source article:

Read the full article on Medium

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