---
id: 56533eb9ac21ba0edf2244b8
title: Concatenating Strings with the Plus Equals Operator
challengeType: 1
videoUrl: 'https://scrimba.com/c/cbQmmC4'
forumTopicId: 16803
---
## Description
We can also use the += operator to concatenate a string onto the end of an existing string variable. This can be very helpful to break a long string over several lines.
Note
Watch out for spaces. Concatenation does not add spaces between concatenated strings, so you'll need to add them yourself.
Example:
```js
var ourStr = "I come first. ";
ourStr += "I come second.";
// ourStr is now "I come first. I come second."
```
## Instructions
Build myStr over several lines by concatenating these two strings: "This is the first sentence. " and "This is the second sentence." using the += operator. Use the += operator similar to how it is shown in the editor. Start by assigning the first string to myStr, then add on the second string.
## Tests
```yml
tests:
- text: myStr should have a value of This is the first sentence. This is the second sentence.
testString: assert(myStr === "This is the first sentence. This is the second sentence.");
- text: You should use the += operator to build myStr.
testString: assert(code.match(/myStr\s*\+=\s*(["']).*\1/g));
```
## Challenge Seed
```js
// Only change code below this line
var myStr;
```
### After Test
```js
(function(){
if(typeof myStr === 'string') {
return 'myStr = "' + myStr + '"';
} else {
return 'myStr is not a string';
}
})();
```
## Solution
```js
var myStr = "This is the first sentence. ";
myStr += "This is the second sentence.";
```