freeCodeCamp/curriculum/challenges/korean/02-javascript-algorithms-and-data-structures/basic-javascript/understand-string-immutability.md

id, title, challengeType, videoUrl, forumTopicId, dashedName

id	title	challengeType	videoUrl	forumTopicId	dashedName
56533eb9ac21ba0edf2244ba	Understand String Immutability	1	https://scrimba.com/c/cWPVaUR	18331	understand-string-immutability

--description--

In JavaScript, String values are immutable, which means that they cannot be altered once created.

For example, the following code will produce an error because the letter B in the string Bob cannot be changed to the letter J:

let myStr = "Bob";
myStr[0] = "J";

Note that this does not mean that myStr could not be re-assigned. The only way to change myStr would be to assign it with a new value, like this:

let myStr = "Bob";
myStr = "Job";

--instructions--

Correct the assignment to myStr so it contains the string value of Hello World using the approach shown in the example above.

--hints--

myStr should have a value of the string Hello World.

assert(myStr === 'Hello World');

You should not change the code above the specified comment.

assert(/myStr = "Jello World"/.test(code));

--seed--

--after-user-code--

(function(v){return "myStr = " + v;})(myStr);

--seed-contents--

// Setup
let myStr = "Jello World";

// Only change code below this line
myStr[0] = "H"; // Change this line
// Only change code above this line

--solutions--

let myStr = "Jello World";
myStr = "Hello World";