freeCodeCamp/curriculum/challenges/chinese-traditional/02-javascript-algorithms-and-data-structures/basic-javascript/introducing-else-if-statements.md

id, title, challengeType, videoUrl, forumTopicId, dashedName

id	title	challengeType	videoUrl	forumTopicId	dashedName
56533eb9ac21ba0edf2244db	介紹 else if 語句	1	https://scrimba.com/c/caeJ2hm	18206	introducing-else-if-statements

--description--

如果你有多個條件語句，你可以通過 else if 語句把 if 語句鏈起來。

if (num > 15) {
  return "Bigger than 15";
} else if (num < 5) {
  return "Smaller than 5";
} else {
  return "Between 5 and 15";
}

--instructions--

使用 else if 實現同樣的效果。

--hints--

你應該至少有兩個 else 表達式。

assert(code.match(/else/g).length > 1);

你應該至少有兩個 if 表達式。

assert(code.match(/if/g).length > 1);

應該關閉每一個 if else 代碼塊。

assert(
  code.match(
    /if\s*\((.+)\)\s*\{[\s\S]+\}\s*else\s+if\s*\((.+)\)\s*\{[\s\S]+\}\s*else\s*\{[\s\S]+\s*\}/
  )
);

testElseIf(0) 應該返回字符串 Smaller than 5

assert(testElseIf(0) === 'Smaller than 5');

testElseIf(5) 應該返回字符串 Between 5 and 10

assert(testElseIf(5) === 'Between 5 and 10');

testElseIf(7) 應該返回字符串 Between 5 and 10

assert(testElseIf(7) === 'Between 5 and 10');

testElseIf(10) 應該返回字符串 Between 5 and 10

assert(testElseIf(10) === 'Between 5 and 10');

testElseIf(12) 應該返回字符串 Greater than 10

assert(testElseIf(12) === 'Greater than 10');

--seed--

--seed-contents--

function testElseIf(val) {
  if (val > 10) {
    return "Greater than 10";
  }

  if (val < 5) {
    return "Smaller than 5";
  }

  return "Between 5 and 10";
}

testElseIf(7);

--solutions--

function testElseIf(val) {
  if(val > 10) {
    return "Greater than 10";
  } else if(val < 5) {
    return "Smaller than 5";
  } else {
    return "Between 5 and 10";
  }
}