Add Mocha test.

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Add Mocha test.

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Add .idea to .gitignore.
Add Mocha test.

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Modified 'countup' function.
Refactor.
Add Mocha test.

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Refactor.
Refactor.
Refactor.
Refactor 'search'.
Add Mocha test.

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Delete .idea.
Delete .idea.
Delete .idea.
Deleted .idea.
Delete .idea.
Refactor.
Refactor.
Refactor.