is-isogram

Test whether a word or phrase is an isogram (a word or phrase without a repeating letter).

Installation

$ npm install is-isogram --save

Usage

var isIsogram = require('is-isogram');
 
// Test whether letters repeat in a word:
 
isIsogram('sandwich');
// -> true
 
isIsogram('wedding');
// -> false
 
 
// Also supports phrases, ignoring spacing:
 
isIsogram('quick on the draw');
// -> true
 
isIsogram('flipped turned upside down');
// -> false