freeCodeCamp/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/concatenating-strings-with-the-plus-equals-operator.english.md

id, title, challengeType, videoUrl, forumTopicId

id	title	challengeType	videoUrl	forumTopicId
56533eb9ac21ba0edf2244b8	Concatenating Strings with the Plus Equals Operator	1	https://scrimba.com/c/cbQmmC4	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:

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

tests:
  - text: <code>myStr</code> should have a value of <code>This is the first sentence. This is the second sentence.</code>
    testString: assert(myStr === "This is the first sentence. This is the second sentence.");
  - text: You should use the <code>+=</code> operator to build <code>myStr</code>.
    testString: assert(code.match(/\w\s*\+=\s*["']/g).length > 1 && code.match(/\w\s*\=\s*["']/g).length > 1);

Challenge Seed

// Only change code below this line

var myStr;

After Test

(function(){
  if(typeof myStr === 'string') {
    return 'myStr = "' + myStr + '"';
  } else {
    return 'myStr is not a string';
  }
})();

Solution

var ourStr = "I come first. ";
ourStr += "I come second.";

var myStr = "This is the first sentence. ";
myStr += "This is the second sentence.";