Jane Street Code Review Iron is Jane Street s internal code review tool A key design decision was to review diffs rather than patches We no longer release the code of Iron and do not expect that will change It was never possible to run outside of Jane Street and is not plausible that it ever will due to dependencies on many aspects of our internal environment
Scenario 1 Simple patch review One simple approach to code review is patch review Here s how it might work in a simple case Bob develops a new feature He creates a patch and shows the patch to Alice Alice reviews the patch and if it looks good she approves it The patch is accepted and applied to the tree making a new revision Code review is a fundamental part of developing high quality software but it s also a difficult practice to apply rigorously As a team grows larger and its
Jane Street Code Review
Jane Street Code Review
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Our next talk How Jane Street Does Code Review should fit the bill The talk is being given by our own Ian Henry and discusses how we approach code review and in particular how Iron the code review system we ve been using and improving for some years now fits in to that process So join us The talk will be on Wednesday Nov 15th Jane Street has developed an in house code review tool called Iron that focuses on making code review more valuable efficient and collaborative by using heuristics simplifying diffs providing meaningful feedback and streamlining the process through a custom Emacs interface
Code review happens entirely within the editor You re fed a series of diffs one keystroke to approve one keystroke to start editing Dive in make your changes leave comments for the author push and move on We ve actually developed this workflow at Jane Street and it s been used daily by hundreds of engineers for about two years now Today Jane Street s source code is 25m lines long about half as much as the Large Hadron Collider uses Building trading systems is on some levels terrifying Mr Minsky admits
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This guide documents what you could call Jane Street s house style It s not an absolute guide to how code is written everywhere here different groups make different decisions in some cases We ll document some of the variations here while noting which one of those we think of as the house style Even though the house style isn t Code review were immensely valuable part 1 Iron I thought that the code reviews I got at Jane Street were rock solid helped me learn the language and the coding conventions very quickly and consistently helped make great improvements to the architecture of my code There s a historical element to code reviews at Jane Street
Jane Street is a quantitative trading firm and liquidity provider with a unique focus on technology and collaborative problem solving that means we write tests for code We re factor code when it gets hard to read We do code review on code These are all things that by default people don t really think about doing for configuration Code review is one of the main ways that we have to ensure that the production code works What we do for the majority of the code is there s a person who writes it there is a person who reviews it and also code needs to go through a process called seconding which is where basically the person who has reviewed has signed off on it
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Jane Street Code Review - Today Jane Street s source code is 25m lines long about half as much as the Large Hadron Collider uses Building trading systems is on some levels terrifying Mr Minsky admits