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id	title	challengeType	videoUrl	forumTopicId	dashedName
56533eb9ac21ba0edf2244e0	Replacing If Else Chains with Switch	1	https://scrimba.com/c/c3JE8fy	18266	replacing-if-else-chains-with-switch

--description--

If you have many options to choose from, a switch statement can be easier to write than many chained if/else if statements. The following:

if (val === 1) {
  answer = "a";
} else if (val === 2) {
  answer = "b";
} else {
  answer = "c";
}

can be replaced with:

switch(val) {
  case 1:
    answer = "a";
    break;
  case 2:
    answer = "b";
    break;
  default:
    answer = "c";
}

--instructions--

Change the chained if/else if statements into a switch statement.

--hints--

You should not use any else statements anywhere in the editor

assert(!/else/g.test(code));

You should not use any if statements anywhere in the editor

assert(!/if/g.test(code));

You should have at least four break statements

assert(code.match(/break/g).length >= 4);

chainToSwitch("bob") should be the string Marley

assert(chainToSwitch('bob') === 'Marley');

chainToSwitch(42) should be the string The Answer

assert(chainToSwitch(42) === 'The Answer');

chainToSwitch(1) should be the string There is no #1

assert(chainToSwitch(1) === 'There is no #1');

chainToSwitch(99) should be the string Missed me by this much!

assert(chainToSwitch(99) === 'Missed me by this much!');

chainToSwitch(7) should be the string Ate Nine

assert(chainToSwitch(7) === 'Ate Nine');

chainToSwitch("John") should be "" (empty string)

assert(chainToSwitch('John') === '');

chainToSwitch(156) should be "" (empty string)

assert(chainToSwitch(156) === '');

--seed--

--seed-contents--

function chainToSwitch(val) {
  let answer = "";
  // Only change code below this line

  if (val === "bob") {
    answer = "Marley";
  } else if (val === 42) {
    answer = "The Answer";
  } else if (val === 1) {
    answer = "There is no #1";
  } else if (val === 99) {
    answer = "Missed me by this much!";
  } else if (val === 7) {
    answer = "Ate Nine";
  }

  // Only change code above this line
  return answer;
}

chainToSwitch(7);

--solutions--

function chainToSwitch(val) {
  let answer = "";

  switch(val) {
    case "bob":
      answer = "Marley";
      break;
    case 42:
      answer = "The Answer";
      break;
    case 1:
      answer = "There is no #1";
      break;
    case 99:
      answer = "Missed me by this much!";
      break;
    case 7:
      answer = "Ate Nine";
  }
  return answer;
}

2.6 KiB Raw Blame History