Method nUnique

src/danfojs-base/core/series.ts:1097–1099

* Return the number of unique elements in a Series * @example * ``` * const sf = new Series([1, 2, 3, 4, 5, 6, 1, 2, 3, 4, 5, 6]); * console.log(sf.nUnique()); * //output 6 * ``` *

()

     * 
    */
    nUnique(): number {
        return (new Set(this.values as ArrayType1D)).size;
    }

    /**
     * Returns unique values and their counts in a Series