--- id: 56533eb9ac21ba0edf2244b8 title: Concatenating Strings with the Plus Equals Operator challengeType: 1 videoUrl: 'https://scrimba.com/c/cbQmmC4' forumTopicId: 16803 dashedName: concatenating-strings-with-the-plus-equals-operator --- # --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 let ourStr = "I come first. "; ourStr += "I come second."; ``` `ourStr` now has a value of the string `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 example and be sure to include a space between the two strings. Start by assigning the first string to `myStr`, then add on the second string. # --hints-- `myStr` should have a value of the string `This is the first sentence. This is the second sentence.` ```js assert(myStr === 'This is the first sentence. This is the second sentence.'); ``` You should use the `+=` operator to build `myStr`. ```js assert(code.match(/myStr\s*\+=\s*(["']).*\1/g)); ``` # --seed-- ## --after-user-code-- ```js (function(){ if(typeof myStr === 'string') { return 'myStr = "' + myStr + '"'; } else { return 'myStr is not a string'; } })(); ``` ## --seed-contents-- ```js let myStr; ``` # --solutions-- ```js let myStr = "This is the first sentence. "; myStr += "This is the second sentence."; ```