freeCodeCamp/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/local-scope-and-functions.md

id, title, challengeType, videoUrl, forumTopicId, dashedName

id	title	challengeType	videoUrl	forumTopicId	dashedName
56533eb9ac21ba0edf2244bf	Local Scope and Functions	1	https://scrimba.com/c/cd62NhM	18227	local-scope-and-functions

--description--

Variables which are declared within a function, as well as the function parameters, have local scope. That means they are only visible within that function.

Here is a function myTest with a local variable called loc.

function myTest() {
  const loc = "foo";
  console.log(loc);
}

myTest();
console.log(loc);

The myTest() function call will display the string foo in the console. The console.log(loc) line will throw an error, as loc is not defined outside of the function.

--instructions--

The editor has two console.logs to help you see what is happening. Check the console as you code to see how it changes. Declare a local variable myVar inside myLocalScope and run the tests.

Note: The console will still display ReferenceError: myVar is not defined, but this will not cause the tests to fail.

--hints--

The code should not contain a global myVar variable.

function declared() {
  myVar;
}

assert.throws(declared, ReferenceError);

You should add a local myVar variable.

assert(
  /functionmyLocalScope\(\)\{.*(var|let|const)myVar[\s\S]*}/.test(
    __helpers.removeWhiteSpace(code)
  )
);

--seed--

--seed-contents--

function myLocalScope() {
  // Only change code below this line

  console.log('inside myLocalScope', myVar);
}
myLocalScope();

// Run and check the console
// myVar is not defined outside of myLocalScope
console.log('outside myLocalScope', myVar);

--solutions--

function myLocalScope() {
  // Only change code below this line
  let myVar;
  console.log('inside myLocalScope', myVar);
}
myLocalScope();

// Run and check the console
// myVar is not defined outside of myLocalScope
console.log('outside myLocalScope', myVar);