freeCodeCamp/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-multiple-conditional-ternary-operators.md

id, title, challengeType, videoUrl, forumTopicId

id	title	challengeType	videoUrl	forumTopicId
587d7b7e367417b2b2512b21	Use Multiple Conditional (Ternary) Operators	1	https://scrimba.com/c/cyWJBT4	301179

Description

In the previous challenge, you used a single conditional operator. You can also chain them together to check for multiple conditions. The following function uses if, else if, and else statements to check multiple conditions:

function findGreaterOrEqual(a, b) {
  if (a === b) {
    return "a and b are equal";
  }
  else if (a > b) {
    return "a is greater";
  }
  else {
    return "b is greater";
  }
}

The above function can be re-written using multiple conditional operators:

function findGreaterOrEqual(a, b) {
  return (a === b) ? "a and b are equal" 
    : (a > b) ? "a is greater" 
    : "b is greater";
}

It is considered best practice to format multiple conditional operators such that each condition is on a separate line, as shown above. Using multiple conditional operators without proper indentation may make your code hard to read. For example:

function findGreaterOrEqual(a, b) {
  return (a === b) ? "a and b are equal" : (a > b) ? "a is greater" : "b is greater";
}

Instructions

In the checkSign function, use multiple conditional operators - following the recommended format used in findGreaterOrEqual - to check if a number is positive, negative or zero. The function should return "positive", "negative" or "zero".

Tests

tests:
  - text: <code>checkSign</code> should use multiple conditional operators
    testString: assert(/.+?\s*?\?\s*?.+?\s*?:\s*?.+?\s*?\?\s*?.+?\s*?:\s*?.+?/gi.test(code));
  - text: <code>checkSign(10)</code> should return "positive". Note that capitalization matters
    testString: assert(checkSign(10) === 'positive');
  - text: <code>checkSign(-12)</code> should return "negative". Note that capitalization matters
    testString: assert(checkSign(-12) === 'negative');
  - text: <code>checkSign(0)</code> should return "zero". Note that capitalization matters
    testString: assert(checkSign(0) === 'zero');

Challenge Seed

function checkSign(num) {

}

checkSign(10);

Solution

function checkSign(num) {
  return (num > 0) ? 'positive' : (num < 0) ? 'negative' : 'zero';
}