Function unique

src/scripts/highlighting/textHighlighter.js:83–87

* Returns array without duplicated values. * @param {Array} arr * @returns {Array}

(arr)

     * @returns {Array}
     */
    function unique(arr) {
        return arr.filter(function (value, idx, self) {
            return self.indexOf(value) === idx;
        });
    }

    /**
     * Takes range object as parameter and refines it boundaries