Question about solution 3

Solution 3:

function rangeOfNumbers(startNum, endNum) {
  return startNum === endNum
    ? [startNum]
    : [...rangeOfNumbers(startNum, endNum - 1), endNum ];

This hasn’t been covered yet and was wondering what the three dots mean in the false part of the conditional operator?

Challenge: Use Recursion to Create a Range of Numbers

Link to the challenge:

That is the spread operator:

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