Determine if a word or phrase is an isogram.
An isogram (also known as a "nonpattern word") is a word or phrase without a repeating letter, however spaces and hyphens are allowed to appear multiple times.
Examples of isograms:
The word isograms, however, is not an isogram, because the s repeats.
Execute the tests with:
$ mix test
In the test suites, all but the first test have been skipped.
Once you get a test passing, you can unskip the next one by
commenting out the relevant @tag :pending
with a #
symbol.
For example:
# @tag :pending
test "shouting" do
assert Bob.hey("WATCH OUT!") == "Whoa, chill out!"
end
Or, you can enable all the tests by commenting out the
ExUnit.configure
line in the test suite.
# ExUnit.configure exclude: :pending, trace: true
If you're stuck on something, it may help to look at some of the available resources out there where answers might be found.
Wikipedia https://en.wikipedia.org/wiki/Isogram
It's possible to submit an incomplete solution so you can see how others have completed the exercise.
defmodule IsogramTest do
use ExUnit.Case
test "isogram lowercase" do
assert Isogram.isogram?("subdermatoglyphic")
end
@tag :pending
test "not isogram lowercase " do
refute Isogram.isogram?("eleven")
end
@tag :pending
test "isogram uppercase" do
assert Isogram.isogram?("DEMONSTRABLY")
end
@tag :pending
test "not isogram uppercase" do
refute Isogram.isogram?("ALPHABET")
end
@tag :pending
test "isogram with dash" do
assert Isogram.isogram?("hjelmqvist-gryb-zock-pfund-wax")
end
@tag :pending
test "not isogram with dash" do
refute Isogram.isogram?("twenty-five")
end
@tag :pending
test "phrase is isogram" do
assert Isogram.isogram?("emily jung schwartzkopf")
end
@tag :pending
test "phrase is not isogram" do
refute Isogram.isogram?("the quick brown fox")
end
end
ExUnit.start()
ExUnit.configure(exclude: :pending, trace: true)
defmodule Isogram do
@doc """
Determines if a word or sentence is an isogram
"""
@spec isogram?(String.t()) :: boolean
def isogram?(sentence) do
characters = Regex.scan(~r{\w}, sentence)
characters == Enum.uniq(characters)
end
end
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