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tiagodealmeida/firstRepeatingLetter.js

Created April 19, 2017 11:50
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firstRepeatingLetter function code challenge
Raw
firstRepeatingLetter.js
var str = 'tyiyrHFTH';
function firstRepeatingLetter(string) {
var exp = /(.).*(\1)/g;
var res = exp.exec(string);
return res ? res[1] : string.length ? string[0] : null;
}
console.info(firstRepeatingLetter(str));
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