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katrinleinweber's solution

to Pangram in the R Track

Published at Jul 13 2018 · 0 comments
Test suite

Determine if a sentence is a pangram. A pangram (Greek: παν γράμμα, pan gramma, "every letter") is a sentence using every letter of the alphabet at least once. The best known English pangram is:

The quick brown fox jumps over the lazy dog.

The alphabet used consists of ASCII letters a to z, inclusive, and is case insensitive. Input will not contain non-ASCII symbols.


See this guide 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. 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.


Wikipedia https://en.wikipedia.org/wiki/Pangram

Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.




test_that("sentence empty", {

test_that("pangram with only lower case", {
    expect_true(is_pangram("the quick brown fox jumps over the lazy dog"))

test_that("missing character 'x'", {
      is_pangram("a quick movement of the enemy will jeopardize five gunboats"))

test_that("another missing character 'x'", {
    expect_false(is_pangram("the quick brown fish jumps over the lazy dog"))

test_that("pangram with underscores", {

test_that("pangram with numbers", {
    expect_true(is_pangram("the 1 quick brown fox jumps over the 2 lazy dogs"))

test_that("missing letters replaced by numbers", {
    expect_false(is_pangram("7h3 qu1ck brown fox jumps ov3r 7h3 lazy dog"))

test_that("pangram with mixed case and punctuation", {
    expect_true(is_pangram("\"Five quacking Zephyrs jolt my wax bed.\""))

test_that("upper and lower case versions of the same character should not be 
          counted separately", {
    expect_false(is_pangram("the quick brown fox jumped over the lazy FOX"))

message("All tests passed for exercise: pangram")
is_pangram <- function(input) {


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