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:
- lumberjacks
- background
- downstream
- six-year-old
The word isograms, however, is not an isogram, because the s repeats.
Go through the setup instructions for TypeScript to install the necessary dependencies:
https://exercism.io/tracks/typescript/installation
Install assignment dependencies:
$ yarn installExecute the tests with:
$ yarn testIn the test suites all tests but the first have been skipped.
Once you get a test passing, you can enable the next one by changing xit to
it.
Wikipedia https://en.wikipedia.org/wiki/Isogram
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