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

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

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.

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.", '<code>myStr</code> should have a value of <code>This is the first sentence. This is the second sentence.</code>');
  - text: 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, 'Use the <code>+=</code> operator to build <code>myStr</code>');

Challenge Seed

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

// 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.";