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---
id: 56533eb9ac21ba0edf2244b0
title: Compound Assignment With Augmented Subtraction
challengeType: 1
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videoUrl: https://scrimba.com/c/c2Qv7AV
forumTopicId: 16660
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localeTitle: Соединение с расширенной вычитанием
---
## Description
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< section id = 'description' >
Как и оператор < code > +=< / code > , < code > -=< / code > вычитает число из переменной. < code > myVar = myVar - 5;< / code > вычитает < code > 5< / code > из < code > myVar< / code > . Это можно переписать как: < code > myVar -= 5;< / code >
< / section >
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## Instructions
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< section id = 'instructions' >
Преобразуйте присвоения для < code > a< / code > , < code > b< / code > и < code > c< / code > для использования оператора < code > -=< / code > .
< / section >
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## Tests
< section id = 'tests' >
```yml
tests:
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- text: < code > a</ code > should equal < code > 5</ code >
testString: assert(a === 5);
- text: < code > b</ code > should equal < code > -6</ code >
testString: assert(b === -6);
- text: < code > c</ code > should equal < code > 2</ code >
testString: assert(c === 2);
- text: You should use the < code > -=</ code > operator for each variable
testString: assert(code.match(/-=/g).length === 3);
- 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));
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```
< / section >
## Challenge Seed
< section id = 'challengeSeed' >
< div id = 'js-seed' >
```js
var a = 11;
var b = 9;
var c = 3;
// Only modify code below this line
a = a - 6;
b = b - 15;
c = c - 1;
```
< / div >
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### After Tests
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< div id = 'js-teardown' >
```js
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(function(a,b,c){ return "a = " + a + ", b = " + b + ", c = " + c; })(a,b,c);
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```
< / div >
< / section >
## Solution
< section id = 'solution' >
```js
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var a = 11;
var b = 9;
var c = 3;
a -= 6;
b -= 15;
c -= 1;
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```
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< / section >