Find First Unique

// Find first non-repeating character in a string
function findUnique(str) {
    
    if (!str) return false;
    var unique;

    for (var i = 0; i < str.length; i++) {

        unique = true;
        
        for (var j = 0; j < str.length; j++) {

            if (str[i].toLowerCase() == str[j].toLowerCase() && i != j) unique = false;
        
        }
        
        if (unique) return str[i];
        
    }
    
    return false;
}

console.log(
    findUnique("racecar")
)