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unique('bacdefgxpedl');

function unique(str){
    const chars = str.split('').sort(); // O(n * log(n))
    for(let i = 1; i < chars.length ; i++){ // O(n)
        if( chars[i] === chars[i-1] ){  //
        	console.log('unique FALSE')
            return false;
        }
    }
    console.log('unique TRUE')
    return true;
}

//Time: O(n *log(n)) + O(n) => O(n + n *log(n)) => O(n * log(n))
//Space: O(n) we take the same amount of space that the size of the input.