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

id, title, challengeType

id	title	challengeType
587d7b7e367417b2b2512b24	Use the Conditional (Ternary) Operator	1

Description

The conditional operator, also called the ternary operator, can be used as a one line if-else expression. The syntax is: condition ? statement-if-true : statement-if-false; The following function uses an if-else statement to check a condition:

function findGreater(a, b) {
  if(a > b) {
    return "a is greater";
  }
  else {
    return "b is greater";
  }
}

This can be re-written using the conditional operator:

function findGreater(a, b) {
  return a > b ? "a is greater" : "b is greater";
}

Instructions

Use the conditional operator in the checkEqual function to check if two numbers are equal or not. The function should return either true or false.

Tests

tests:
  - text: <code>checkEqual</code> should use the <code>conditional operator</code>
    testString: assert(/.+?\s*?\?\s*?.+?\s*?:\s*?.+?/gi.test(code), '<code>checkEqual</code> should use the <code>conditional operator</code>');
  - text: <code>checkEqual(1, 2)</code> should return false
    testString: assert(checkEqual(1, 2) === false, '<code>checkEqual(1, 2)</code> should return false');
  - text: <code>checkEqual(1, 1)</code> should return true
    testString: assert(checkEqual(1, 1) === true, '<code>checkEqual(1, 1)</code> should return true');
  - text: <code>checkEqual(1, -1)</code> should return false
    testString: assert(checkEqual(1, -1) === false, '<code>checkEqual(1, -1)</code> should return false');

Challenge Seed

function checkEqual(a, b) {

}

checkEqual(1, 2);

Solution

function checkEqual(a, b) {
  return a === b ? true : false;
}