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@aammd
Last active Jan 25, 2017
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An example of calculating "FizzBuzz" in R using dplyr and magrittr

Apparently, there is a simple problem called Fizz buzz which is sometimes used to identify competent programmers. A good opportunity to practice some dplyr and magrittr tricks.

library(dplyr)
library(magrittr)
library(knitr)

1:100 %>%
  data.frame %>%
  set_names("num") %>%
  tbl_df %>%
  mutate(fizz=num %>% mod(3) %>% equals(0) %>% ifelse("fizz",num),
         buzz=num %>% mod(5) %>% equals(0) %>% ifelse("buzz",fizz),
         fizzbuzz= num %>% mod(15) %>% equals(0) %>% ifelse("fizzbuzz",buzz)
         ) %>%
  select(num,fizzbuzz) %>%
  kable("markdown")
num fizzbuzz
1 1
2 2
3 fizz
4 4
5 buzz
6 fizz
7 7
8 8
9 fizz
10 buzz
11 11
12 fizz
13 13
14 14
15 fizzbuzz
16 16
17 17
18 fizz
19 19
20 buzz
21 fizz
22 22
23 23
24 fizz
25 buzz
26 26
27 fizz
28 28
29 29
30 fizzbuzz
31 31
32 32
33 fizz
34 34
35 buzz
36 fizz
37 37
38 38
39 fizz
40 buzz
41 41
42 fizz
43 43
44 44
45 fizzbuzz
46 46
47 47
48 fizz
49 49
50 buzz
51 fizz
52 52
53 53
54 fizz
55 buzz
56 56
57 fizz
58 58
59 59
60 fizzbuzz
61 61
62 62
63 fizz
64 64
65 buzz
66 fizz
67 67
68 68
69 fizz
70 buzz
71 71
72 fizz
73 73
74 74
75 fizzbuzz
76 76
77 77
78 fizz
79 79
80 buzz
81 fizz
82 82
83 83
84 fizz
85 buzz
86 86
87 fizz
88 88
89 89
90 fizzbuzz
91 91
92 92
93 fizz
94 94
95 buzz
96 fizz
97 97
98 98
99 fizz
100 buzz
@jangorecki

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@jangorecki jangorecki commented Oct 20, 2015

I hope nobody is solving this way on R interviews :)
Below easy to follow alternative:

f = seq(3,100,3)
b = seq(5,100,5)
fb = f[f %in% b] 
f = f[!f %in% fb]
b = b[!b %in% fb]
x = as.character(1:100)
x[f] = "Fizz"
x[b] = "Buzz"
x[fb] = "FizzBuzz"
cat(x, sep = "\n")
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