Add Fizz Buzz exercise

* Add files, questions, example answer and tests
* Fix linting errors by lintr-bot
* Add config (using UUID package)
* Style all files using styler::style_directory()
* Change con-cat()-enated string to c()-ombined vector of strings
* Add different sources
* Refactor function name

Author: tintinthong

config.json

@@ -381,6 +381,17 @@
         "filtering",
         "strings"
       ]
+    },
+    {
+      "slug": "fizz-buzz",
+      "uuid": "b35ca909-3389-4427-810f-775aa174001f",
+      "core": false,
+      "unlocked_by": "raindrops",
+      "difficulty": 1,
+      "topics": [
+        "control_flow_conditionals",
+        "text_formatting"
+      ]
     }
   ]
 }

exercises/fizz-buzz/README.md

@@ -0,0 +1,29 @@
+# Fizz Buzz
+
+Print numbers from 1 to n with the following exceptions:
+
+1. When a number is a multiple of 3, then print "Fizz"
+2. When a number is a multiple of 5, then print "Buzz"
+3. When a number is both a multiple of 3 and a multiple of 5, then print "Fizz Buzz"
+
+The output should be a vector of strings, such as, "1" "2" "Fizz" "4" "Buzz" ...
+
+## Installation
+See [this guide](https://exercism.io/tracks/r/installation) for instructions on how to setup your local R environment.
+
+## How to implement your solution
+In each problem folder, there is a file named `<exercise_name>.R` containing a function that returns a `NULL` value. Place your implementation inside the body of the function.
+
+## How to run tests
+Inside of RStudio, simply execute the `test_<exercise_name>.R` script. This can be conveniently done with [testthat's `auto_test` function](https://www.rdocumentation.org/packages/testthat/topics/auto_test). Because Exercism code and tests are in the same folder, use this same path for both `code_path` and `test_path` parameters. On the command-line, you can also run `Rscript test_<exercise_name>.R`.
+
+## Source
+
+"Fizz-Buzz" originated as a children's game that helped children learn to divide. It is now regularly used in coding interviews. 
+
+1. [Actual Source](https://imranontech.com/2007/01/24/using-fizzbuzz-to-find-developers-who-grok-coding)
+2. [Rosetta Code](https://rosettacode.org/wiki/FizzBuzz) 
+3. [Code Golf](https://code-golf.io/fizz-buzz)
+
+## Submitting Incomplete Solutions
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.

exercises/fizz-buzz/example.R

@@ -0,0 +1,16 @@
+fizz_buzz <- function(input) {
+  replace_number <- function(i) {
+    if (i %% 3 == 0 && i %% 5 == 0) {
+      return("Fizz Buzz")
+    } else if (i %% 3 == 0) {
+      return("Fizz")
+    } else if (i %% 5 == 0) {
+      return("Buzz")
+    } else {
+      return(i)
+    }
+  }
+
+  out <- sapply(seq(1, input), replace_number)
+  return(out)
+}

exercises/fizz-buzz/fizz-buzz.R

@@ -0,0 +1,2 @@
+fizz_buzz <- function(input) {
+}

exercises/fizz-buzz/test_fizz-buzz.R

@@ -0,0 +1,25 @@
+source("./fizz-buzz.R")
+library(testthat)
+
+ans10 <- c("1", "2", "Fizz", "4", "Buzz", "Fizz", "7", "8", "Fizz", "Buzz")
+
+ans100 <- c(
+  "1", "2", "Fizz", "4", "Buzz", "Fizz", "7", "8", "Fizz", "Buzz", "11", "Fizz",
+  "13", "14", "Fizz Buzz", "16", "17", "Fizz", "19", "Buzz", "Fizz", "22", "23",
+  "Fizz", "Buzz", "26", "Fizz", "28", "29", "Fizz Buzz", "31", "32", "Fizz",
+  "34", "Buzz", "Fizz", "37", "38", "Fizz", "Buzz", "41", "Fizz", "43", "44",
+  "Fizz Buzz", "46", "47", "Fizz", "49", "Buzz", "Fizz", "52", "53", "Fizz",
+  "Buzz", "56", "Fizz", "58", "59", "Fizz Buzz", "61", "62", "Fizz", "64",
+  "Buzz", "Fizz", "67", "68", "Fizz", "Buzz", "71", "Fizz", "73", "74",
+  "Fizz Buzz", "76", "77", "Fizz", "79", "Buzz", "Fizz", "82", "83", "Fizz",
+  "Buzz", "86", "Fizz", "88", "89", "Fizz Buzz", "91", "92", "Fizz", "94",
+  "Buzz", "Fizz", "97", "98", "Fizz", "Buzz"
+)
+
+
+test_that("Vector of strings match", {
+  expect_identical(fizz_buzz(10), ans10)
+  expect_identical(fizz_buzz(100), ans100)
+})
+
+message("All tests passed for exercise: fizz-buzz")