--- id: 56533eb9ac21ba0edf2244af title: Compound Assignment With Augmented Addition challengeType: 1 --- ## Description
In programming, it is common to use assignments to modify the contents of a variable. Remember that everything to the right of the equals sign is evaluated first, so we can say: myVar = myVar + 5; to add 5 to myVar. Since this is such a common pattern, there are operators which do both a mathematical operation and assignment in one step. One such operator is the += operator.
var myVar = 1;
myVar += 5;
console.log(myVar); // Returns 6
## Instructions
Convert the assignments for a, b, and c to use the += operator.
## Tests
```yml tests: - text: a should equal 15 testString: 'assert(a === 15, "a should equal 15");' - text: b should equal 26 testString: 'assert(b === 26, "b should equal 26");' - text: c should equal 19 testString: 'assert(c === 19, "c should equal 19");' - text: You should use the += operator for each variable testString: 'assert(code.match(/\+=/g).length === 3, "You should use the += operator for each variable");' - text: Do not modify the code above the line testString: 'assert(/var a = 3;/.test(code) && /var b = 17;/.test(code) && /var c = 12;/.test(code), "Do not modify the code above the line");' ```
## Challenge Seed
```js var a = 3; var b = 17; var c = 12; // Only modify code below this line a = a + 12; b = 9 + b; c = c + 7; ```
### After Test
```js console.info('after the test'); ```
## Solution
```js var a = 3; var b = 17; var c = 12; a += 12; b += 9; c += 7; ```