Unique Email Addresses Unique Email Addresses
Undefined
English

Every valid email consists of name and domain, separated by the '@' sign. Besides lowercase letters, the email may contain one or more '.' or '+'. For example, in "alex@checkio.org", "alex" is the name, and "checkio.org" is the domain.

If you add periods '.' between some characters in the name part of an email address, mail sent there will be delivered to the same address without dots in the name. Note that this rule does not apply to domain names. For example, "a.lyabah@checkio.org" and "alyabah@checkio.org" delivered to the same email address.

If you add a plus '+' in the name, everything after the first plus sign will be ignored. This allows certain emails to be filtered. Note that this rule does not apply to domain names. For example, "alex+home@checkio.org" will be delivered to "alex@checkio.org".

It is possible to use both of these rules at the same time.

Given an array of strings - valid emails, return the number of unique emails.

Input: Array of strings(valid emails)

Output: Int.

Example:

assert unique_emails(["alex@checkio.org", "mike@google.com", "lili@apple.com"]) == 3
assert (
    unique_emails(
        ["mi.ke@google.com", "alex@checkio.org", "mike@google.com", "lili@apple.com"]
    )
    == 3
)
assert (
    unique_emails(
        [
            "alex+home@checkio.org",
            "lili+work@apple.com",
            "alex@checkio.org",
            "lili@apple.com",
        ]
    )
    == 2
)
assert (
    unique_emails(
        [
            "l.ili+work@apple.com",
            "a.lex@checkio.org",
            "alex+home@checkio.org",
            "lili+work@apple.com",
            "alex@checkio.org",
            "lili@apple.com",
        ]
    )
    == 2
)

How it is used: for filtering our your maillist

Precondition: all emails are valid

Settings
Code:
CheckiO Extensions

CheckiO Extensions allow you to use local files to solve missions. More info in a blog post.

In order to install CheckiO client you'll need installed Python (version at least 3.8)

Install CheckiO Client first:

pip3 install checkio_client

Configure your tool

checkio --domain=py config --key=

Sync solutions into your local folder

checkio sync

(in beta testing) Launch local server so your browser can use it and sync solution between local file end extension on the fly. (doesn't work for safari)

checkio serv -d

Alternatevly, you can install Chrome extension or FF addon

checkio install-plugin
checkio install-plugin --ff
checkio install-plugin --chromium

Read more here about other functionality that the checkio client provides. Feel free to submit an issue in case of any difficulties.

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