freecodecamp--freecodecamp/curriculum/challenges/english/blocks/daily-coding-challenges-javascript/68c1a929005bf54d342aa8d2.md

id, title, challengeType, dashedName

id	title	challengeType	dashedName
68c1a929005bf54d342aa8d2	Challenge 55: Space Week Day 1: Stellar Classification	28	challenge-55

--description--

October 4th marks the beginning of World Space Week. The next seven days will bring you astronomy-themed coding challenges.

For today's challenge, you are given the surface temperature of a star in Kelvin (K) and need to determine its stellar classification based on the following ranges:

• "O": 30,000 K or higher

• "B": 10,000 K - 29,999 K

• "A": 7,500 K - 9,999 K

• "F": 6,000 K - 7,499 K

• "G": 5,200 K - 5,999 K

• "K": 3,700 K - 5,199 K

• "M": 0 K - 3,699 K

• Return the classification of the given star.

--hints--

classification(5778) should return "G".

assert.equal(classification(5778), "G");

classification(2400) should return "M".

assert.equal(classification(2400), "M");

classification(9999) should return "A".

assert.equal(classification(9999), "A");

classification(3700) should return "K".

assert.equal(classification(3700), "K");

classification(3699) should return "M".

assert.equal(classification(3699), "M");

classification(210000) should return "O".

assert.equal(classification(210000), "O");

classification(6000) should return "F".

assert.equal(classification(6000), "F");

classification(11432) should return "B".

assert.equal(classification(11432), "B");

--seed--

--seed-contents--

function classification(temp) {

  return temp;
}

--solutions--

function classification(temp) {
  if (temp >= 30000) return "O";
  if (temp >= 10000) return "B";
  if (temp >= 7500) return "A";
  if (temp >= 6000) return "F";
  if (temp >= 5200) return "G";
  if (temp >= 3700) return "K";
  return "M";
}