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Switch statement within function returns "undefined" for no obvious reason

I am trying to create a simplistic function which uses a switch statement to return a weighted number. For my use case, the solution is most befitting, however I am getting "undefined" as the result for no obvious reasons. If anyone could point out the mistake, I'm making.

function randomCase() {
  let n = Math.floor(Math.random() * 100);

  switch (n) {
    case n < 70:
      return 1;
    case n < 80:
      return 2;
    case n < 90:
      return 3;
    case n < 100:
      return 4;
  }
}

temp = randomCase();

console.log(temp);

I tried to debug with Chrome developer tool and figure out what might be causing this, but of no avail. It seems there is something obvious I'm missing. (Still learning JS)

9 months ago · Juan Pablo Isaza

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Answer 1 · 2022-06-30T04:56:20.749Z

As VLAZ mentioned in the comments, a switch statement checks for equality.

You'll want to use an if statement instead:

function randomCase() {
  let n = Math.floor(Math.random() * 100);

  if (n < 70) {
    return 1;
  } else if (n < 80) {
    return 2;
  } else if (n < 90) {
      return 3;
  } else if (n < 100) {
      return 4;
  }
}

temp = randomCase();

console.log(temp);