1-oxygen-levels.js

/*
Many years into the future, a team of Space Voyagers find their ship is low on Oxygen and need to dock somewhere safe while they call home for help.
  
Their computer detects a list of nearby planets that have Oxygen in their atmosphere. It has produced an array of their Oxygen levels.

To be safe to land on, a planet needs to have an Oxygen level between 19.5% and 23.5%.

Write a function that finds the first safe oxygen level in the array - Oxygen between 19.5% and 23.5%
*/

function safeLevels(arr) {
  let safePlanet = arr.find(
    (item) => parseFloat(item) > 19.5 && parseFloat(item) < 23.5
  );
  return safePlanet;
}

/* ======= TESTS - DO NOT MODIFY ===== */

const oxygenLevels1 = ["24.2%", "11.3%", "19.9%", "23.1%", "29.3%", "20.2%"];
const oxygenLevels2 = ["30.8%", "23.5%", "18.8%", "19.5%", "20.2%", "31.6%"];
const oxygenLevels3 = ["200%", "21.1%"];

const util = require("util");

function test(test_name, actual, expected) {
  let status;
  if (actual === expected) {
    status = "PASSED";
  } else {
    status = `FAILED: expected: ${util.inspect(
      expected
    )} but your function returned: ${util.inspect(actual)}`;
  }

  console.log(`${test_name}: ${status}`);
}

test("safeLevels function works - case 1", safeLevels(oxygenLevels1), "19.9%");

test("safeLevels function works - case 2", safeLevels(oxygenLevels2), "20.2%");

test("safeLevels function works - case 3", safeLevels(oxygenLevels3), "21.1%");