Is the Word an Isogram?

Published by Andrew Rosenwinkel in
loopsstringsvalidation

An isogram is a word that has no duplicate letters. Create a function that takes a string and returns either true or false depending on whether or not it's an "isogram".

Examples

IsIsogram("Algorism") ➞ true

IsIsogram("PasSword") ➞ false
// Not case sensitive.

IsIsogram("Consecutive") ➞ false

Notes

  • Ignore letter case (should not be case sensitive).
  • All test cases contain valid one word strings.
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