Method copy

src/danfojs-base/core/frame.ts:2020–2028

* Makes a deep copy of a DataFrame. * @example * ``` * const df = new DataFrame([[1, 2], [3, 4]], { columns: ['A', 'B']}) * const df2 = df.copy() * df2.print() * ```

()

     * ```
     */
    copy(): DataFrame {
        let df = new DataFrame([...this.$data], {
            columns: [...this.columns],
            index: [...this.index],
            dtypes: [...this.dtypes],
            config: { ...this.$config }
        });
        return df;
    }

    /**
     * Return a boolean, same-sized object indicating where elements are empty (NaN, undefined, null).