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In the repository, create the following js file.

// sort.js
var number = [19, 3, 81, 1, 24, 21];
console.log(number);

Once you have created the file, push it to a remote branch. Learn how to push to a remote repository.

Now, we'll walk through how to modify a development branch:

1. Create a branch

First create a branch to work on called "add-sort-func" to sort an array.

$ git checkout -b add-sort-func

Learn how to create a branch.

2. Modify the file and commit

Modify the file as follows.

// sort.js
var sortNumber = function (number) {
  number.sort(function (a, b) {
    if (a == b) {
      return 0;
    }
    return a < b ? -1 : 1;
  });
};

var number = [19, 3, 81, 1, 24, 21];
sortNumber(number);
console.log(number);

Commit when the modification is completed.

$ git add sort.js
$ git commit -m "<commit_message>"

3. Push the modified branch

When a commit is complete, push it to a remote branch.

$ git push origin add-sort-func