js check string for isogram

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Samuel
24 Jun 2017
1// Check if a string is an isogram
2function isIsogram(str){
3   return !str.match(/([a-z]).*\1/i);
4  //or: return new Set(str.toLowerCase()).size === str.length;
5}
6console.log(isIsogram("Dermatoglyphics"));//, true
7console.log(isIsogram("isogram"));		  //, true
8console.log(isIsogram("moOse"));		  //, false
9console.log(isIsogram("isIsogram"));	  //, false
10console.log(isIsogram(""));				  //, true
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