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([2804:14c:bbe3:444c:457e:7000:5b5e:ddd4]) by smtp.gmail.com with ESMTPSA id z188sm6735541qkb.40.2021.02.26.19.10.08 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 26 Feb 2021 19:10:09 -0800 (PST) From: Magali Lemes Subject: [Outreachy] Use of impure functional programming and use of vlists To: =?UTF-8?Q?G=c3=a1bor_Boskovits?= , zimoun , guix-devel@gnu.org Message-ID: Date: Sat, 27 Feb 2021 00:10:05 -0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Received-SPF: pass client-ip=2607:f8b0:4864:20::f32; envelope-from=magalilemes00@gmail.com; helo=mail-qv1-xf32.google.com X-Spam_score_int: -17 X-Spam_score: -1.8 X-Spam_bar: - X-Spam_report: (-1.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: guix-devel@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Development of GNU Guix and the GNU System distribution." 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As my Outreachy internship approaches an end, I'd like to know which of the following options is better for walking and displaying the Git commit history: 1) having a list and then using for-each it to display the commit information; 2) display the list while building it. When it comes to option number 2, the main advantage is that it's faster to perform operations such as 'guix git log --oneline | head -n5'. The downside is that it's not a pure functional programming approach. Another question is, could vlists be used? Since it would be fast to have the commits in a hash table implemented with vlists, we could use 'vlist-for-each' to display the commits. I haven't seen vlist-for-each being used anywhere in Guix, so I wondered if there's a special reason for it not being used, or if it hasn't really been necessary at all thus far. Regards, Magali