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

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

(function(z){return 'myVar = ' + z;})(myVar);

Solution

var myVar = 11;
myVar--;