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

id, title, challengeType, videoUrl, forumTopicId

id	title	challengeType	videoUrl	forumTopicId
56533eb9ac21ba0edf2244af	Compound Assignment With Augmented Addition	1	https://scrimba.com/c/cDR6LCb	16661

--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.

--hints--

a should equal 15.

assert(a === 15);

b should equal 26.

assert(b === 26);

c should equal 19.

assert(c === 19);

You should use the += operator for each variable.

assert(code.match(/\+=/g).length === 3);

You should not modify the code above the specified comment.

assert(
  /var a = 3;/.test(code) &&
    /var b = 17;/.test(code) &&
    /var c = 12;/.test(code)
);

--seed--

--after-user-code--

(function(a,b,c){ return "a = " + a + ", b = " + b + ", c = " + c; })(a,b,c);

--seed-contents--

var a = 3;
var b = 17;
var c = 12;

// Only change code below this line
a = a + 12;
b = 9 + b;
c = c + 7;

--solutions--

var a = 3;
var b = 17;
var c = 12;

a += 12;
b += 9;
c += 7;