freeCodeCamp/curriculum/challenges/english/blocks/daily-coding-challenges-javascript/69f35a5bb823ed620fcb7cbc.md

id, title, challengeType, dashedName

id	title	challengeType	dashedName
69f35a5bb823ed620fcb7cbc	Challenge 283: String Zipper	28	challenge-283

--description--

Given two strings, return a new string that interleaves their characters one at a time. If one string is longer, append the remaining characters at the end.

Begin with the first character of the first string.

--hints--

zipStrings("abc", "123") should return "a1b2c3".

assert.equal(zipStrings("abc", "123"), "a1b2c3");

zipStrings("acegikmoqsuwy", "bdfhjlnprtvxz") should return "abcdefghijklmnopqrstuvwxyz".

assert.equal(zipStrings("acegikmoqsuwy", "bdfhjlnprtvxz"), "abcdefghijklmnopqrstuvwxyz");

zipStrings("day", "night") should return "dnaiyght".

assert.equal(zipStrings("day", "night"), "dnaiyght");

zipStrings("python", "javascript") should return "pjyatvhaosncript".

assert.equal(zipStrings("python", "javascript"), "pjyatvhaosncript");

zipStrings("feCdCm", "reoeap") should return "freeCodeCamp".

assert.equal(zipStrings("feCdCm", "reoeap"), "freeCodeCamp");

--seed--

--seed-contents--

function zipStrings(a, b) {

  return a;
}

--solutions--

function zipStrings(a, b) {
  let result = '';
  const len = Math.max(a.length, b.length);
  for (let i = 0; i < len; i++) {
    if (i < a.length) result += a[i];
    if (i < b.length) result += b[i];
  }
  return result;
}