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The goal ofthe R Programming Style Guide is to make our R code easier to read, share, and verify. The rules below were designed in collaboration with the entire R user community at Google.  \n• Summary: R Style Rules  \n1.  File Names: end in .R  \n2.  Identifiers: [variable.name](variable.name), FunctionName, kConstantName  \n3.  Line Length: maximum 80 characters  \n4. Indentation: two spaces, no tabs  \n5. Spacing  \n6. Curly Braces: first on same line, last on own line  \n7. Assignment: use \u003C - , not =  \n8.  Semicolons: don't use them  \n9. General Layout and Ordering  \n10. Commenting Guidelines: all comments begin with \\# followed by a space; inline comments need two spaces before the \\#  \n11. Function Definitions and Calls  \n12. Function Documentation  \n13. Example Function  \n14. TODO Style: TODO(username)  \n• Summary: R Language Rules  \n1. attach: avoid using it  \n2.  Functions: errors should be raised using stop()  \n3. Objects and Methods: avoid S4 objects and methods when possible; never mix S3 and S4  \n1. Notation and Naming  \no File Names  \nFile names should end in .R and, of course, be meaningful.  \nGOOD: predict_ad_revenue.R  \nBAD: foo .R  \no Identifiers  \nDon't use underscores ( _ ) or hyphens ( - ) in identifiers. Identifiers should be named according to the following conventions. Variable names should have all lower case letters and words separated with dots ( .); function names have initial  \ncapital letters and no dots (CapWords); constants are named like functions but with an initial k.  \n􀂃 variable.name  \nGOOD: avg .clicks  \nBAD: avg_Clicks , avgClicks  \n􀂃 FunctionName  \nGOOD: CalculateAvgClicks  \nBAD: calculate_avg_clicks , calculateAvgClicks  \nMake function names verbs.  \nException: When creating a classed object, the function name  \n(constructor) and class should match (e.g., lm).  \n􀂃 kConstantName  \n2. Syntax  \no Line Length  \nThe maximum line length is 80 characters.  \no Indentation  \nWhen indenting your code, use two spaces. Never use tabs or mix tabs and spaces.  \nException: When a line break occurs inside parentheses, align the wrapped line with the first character inside the parenthesis.  \no Spacing  \nPlace spaces around all binary operators (=, +, - , \u003C-, etc.) .  \nException: Spaces around ='s are optional when passing parameters in a function call.  \nDo not place a space before a comma, but always place one after a comma.  \nGOOD:  \ntabPrior \u003C - table(df[df$daysFromOpt \u003C 0, \"campaignid\"])  \ntotal \u003C - sum(x[, 1])  \ntotal \u003C - sum(x[1, ])  \nBAD:  \ntabPrior \u003C - table(df[df$daysFromOpt\u003C0, \"campaignid\"]) \\# Needs spaces around '\u003C'  \ntabPrior \u003C - table(df[df$daysFromOpt \u003C 0,\"campaignid\"]) \\# Needs a space after the comma  \ntabPrior\u003C - table(df[df$daysFromOpt \u003C 0, \"campaignid\"]) \\# Needs a space before \u003C -  \ntabPrior\u003C-table(df[df$daysFromOpt \u003C 0, \"campaignid\"]) \\# Needs spaces around \u003C -  \ntotal \u003C - sum(x[,1]) \\# Needs a space after the comma  \ntotal \u003C - sum(x[ ,1]) \\# Needs a space after the comma, not before  \nPlace a space before left parenthesis, except in a function call.  \nGOOD:  \nif (debug)  \nBAD:  \nif(debug)  \nExtra spacing (i.e., more than one space in a row) is okay if it improves alignment of equals signs or arrows (\u003C-) .  \nplot(x = xCoord,  \ny = dataMat[, makeColName(metric, ptiles[1], \"roiOpt\")], ylim = ylim,  \nxlab = \"dates\",  \nylab = metric,  \nmain = (paste(metric, \" for 3 samples \", sep=\"\")))  \nDo not place spaces around code in parentheses or square brackets.  \nException: Always place a space after a comma.  \nGOOD:  \nif (debug)  \nx[1, ]  \nBAD:  \nif ( debug ) \\# No spaces around debug  \nx[1,] \\# Needs a space after the comma  \no Curly Braces  \nAn opening curly brace should never go on its own line; a closing curly brace should always go on its own line. You may omit curly braces when a block consists of a single statement; however, you must consistently either use or not use curly ","cbCaicbEvbPkczMf","https://ap.wps.com/l/cbCaicbEvbPkczMf","pdf",63985,"English","# Summary: R Style Rules\n## Summary: R Language Rules\n# File Names and Identifiers\n## Syntax and Formatting\n# Organization and Commenting Guidelines\n## Function Documentation and Calls\n# Example and TODO Style","[{\"question\":\"What are the core requirements for R file names and identifiers?\",\"answer\":\"R files should end with .R and have meaningful names. Identifiers should avoid underscores and hyphens, use lowercase dot-separated variable names, CapWords for functions, and k-prefixed constants like kConstantName.\"},{\"question\":\"How should spacing, indentation, and line length be handled?\",\"answer\":\"Use two-space indentation with no tabs, keep line length to a maximum of 80 characters, and place spaces around binary operators. Commas should have a space after them and never a space before; exceptions apply for parameter passing in function calls.\"},{\"question\":\"What ordering and commenting rules does the guide recommend?\",\"answer\":\"Follow a consistent layout: copyright comment, author comment, file description with purpose/inputs/outputs, then source() and library() calls, function definitions, and executed statements when applicable. Comment lines must start with # followed by a space, and inline comments require two spaces before #.\"}]","Google's R Style Guide - Coding Style Rules | PDF",18]