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curriculum/challenges/english/blocks/workshop-space-mission-roster/694d8ddbfc4bb6940b921bbc.md

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--description--

You should create a shallow copy of the crew array using the slice() method. Name the new array updatedCrew.

Recall that calling slice() without arguments returns a copy of the entire array:

js
const copyArray = originalArray.slice();

--hints--

You should use the slice() method to copy the input crew array and store the result in a new variable named updatedCrew.

js
const funcStr = __helpers.removeJSComments(swapCrewMembers.toString());
assert.match(
  funcStr,
  /(var|let|const)\s+updatedCrew/,
  "You must have at least one space between the declaration keyword (let/const) and 'updatedCrew'"
);

const cleaned = __helpers.removeWhiteSpace(__helpers.removeJSComments(swapCrewMembers.toString()));
assert.match(cleaned, /(var|let|const)updatedCrew=crew\.slice\(\);?\}$/);

--seed--

--seed-contents--

js
const squad = [];

const firstAstronaut = {
  id: 1,
  name: "Andy",
  role: "Commander",
  isEVAEligible: true,
  priority: 3
};

function addCrewMember(crew, astronaut) {
  for (let i = 0; i < crew.length; i++) {
    if (crew[i].id === astronaut.id) {
      console.log("Duplicate ID: " + astronaut.id);
      return;
    }
  }
  crew.push(astronaut);
}

addCrewMember(squad, firstAstronaut);

const remainingCrew = [
  { id: 2, name: "Bart", role: "Pilot", isEVAEligible: false, priority: 8 },
  { id: 3, name: "Caroline", role: "Engineer", isEVAEligible: true, priority: 4 },
  { id: 4, name: "Diego", role: "Scientist", isEVAEligible: false, priority: 1 },
  { id: 5, name: "Elise", role: "Medic", isEVAEligible: true, priority: 7 },
  { id: 6, name: "Felix", role: "Navigator", isEVAEligible: true, priority: 6 },
  { id: 7, name: "Gertrude", role: "Communications", isEVAEligible: false, priority: 4 },
  { id: 8, name: "Hank", role: "Mechanic", isEVAEligible: true, priority: 2 },
  { id: 9, name: "Irene", role: "Specialist", isEVAEligible: true, priority: 5 },
  { id: 10, name: "Joan", role: "Technician", isEVAEligible: false, priority: 1 },
];

for (let i = 0; i < remainingCrew.length; i++) {
  addCrewMember(squad, remainingCrew[i]);
}

function swapCrewMembers(crew, fromIndex, toIndex) {
  if (
    fromIndex < 0 || 
    toIndex < 0 ||
    fromIndex >= crew.length ||
    toIndex >= crew.length
  ) {
    console.log("Invalid crew indices");
    return;
  }
  
--fcc-editable-region--

--fcc-editable-region--
}