Manual

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Coding conventions and checkers
Coding conventions have existed for decades.
1918: The Elements of Style by Strunk & White (writing English)
1974: The Elements of Programming Style (writing code)
1997: Java code conventions
2001: Python style guide
2014: Google style guides for 12 languages available
Style checkers have existed for decades.
1977: lint checks C style
2002: PyChecker checks Python style
2011: gofmt reformats Go code (70% adoption in 2013)