freeCodeCamp/curriculum/challenges/en/02-javascript-algorithms-and-data-structures/basic-javascript/compound-assignment-with-augmented-subtraction.en.md

id, title, challengeType

id	title	challengeType
56533eb9ac21ba0edf2244b0	Compound Assignment With Augmented Subtraction	1

Description

Like the += operator, -= subtracts a number from a variable. myVar = myVar - 5; will subtract 5 from myVar. This can be rewritten as: myVar -= 5;

Instructions

Convert the assignments for a, b, and c to use the -= operator.

Tests

- text: <code>a</code> should equal <code>5</code>
  testString: 'assert(a === 5, ''<code>a</code> should equal <code>5</code>'');'
- text: <code>b</code> should equal <code>-6</code>
  testString: 'assert(b === -6, ''<code>b</code> should equal <code>-6</code>'');'
- text: <code>c</code> should equal <code>2</code>
  testString: 'assert(c === 2, ''<code>c</code> should equal <code>2</code>'');'
- text: You should use the <code>-=</code> operator for each variable
  testString: 'assert(code.match(/-=/g).length === 3, ''You should use the <code>-=</code> operator for each variable'');'
- text: Do not modify the code above the line
  testString: 'assert(/var a = 11;/.test(code) && /var b = 9;/.test(code) && /var c = 3;/.test(code), ''Do not modify the code above the line'');'

Challenge Seed

var a = 11;
var b = 9;
var c = 3;

// Only modify code below this line

a = a - 6;
b = b - 15;
c = c - 1;

After Test

console.info('after the test');

Solution

var a = 11;
var b = 9;
var c = 3;

a -= 6;
b -= 15;
c -= 1;