freeCodeCamp/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/decrement-a-number-with-javascript.english.md

id, title, challengeType

id	title	challengeType
56533eb9ac21ba0edf2244ad	Decrement a Number with JavaScript	1

Description

You can easily decrement or decrease a variable by one with the -- operator. i--; is the equivalent of i = i - 1; Note
The entire line becomes i--;, eliminating the need for the equal sign.

Instructions

Change the code to use the -- operator on myVar.

Tests

tests:
  - text: <code>myVar</code> should equal <code>10</code>
    testString: 'assert(myVar === 10, "<code>myVar</code> should equal <code>10</code>");'
  - text: <code>myVar = myVar - 1;</code> should be changed
    testString: 'assert(/var\s*myVar\s*=\s*11;\s*\/*.*\s*([-]{2}\s*myVar|myVar\s*[-]{2});/.test(code), "<code>myVar = myVar - 1;</code> should be changed");'
  - text: Use the <code>--</code> operator on <code>myVar</code>
    testString: 'assert(/[-]{2}\s*myVar|myVar\s*[-]{2}/.test(code), "Use the <code>--</code> operator on <code>myVar</code>");'
  - text: Do not change code above the line
    testString: 'assert(/var myVar = 11;/.test(code), "Do not change code above the line");'

Challenge Seed

var myVar = 11;

// Only change code below this line
myVar = myVar - 1;

After Test

console.info('after the test');

Solution

var myVar = 11;
myVar--;