Method is1DArray

src/danfojs-base/shared/utils.ts:369–380

* Checks if array is 1D * @param arr The array

(arr: ArrayType1D | ArrayType2D)

     * @param arr The array 
    */
    is1DArray(arr: ArrayType1D | ArrayType2D): boolean {
        if (
            typeof arr[0] == "number" ||
            typeof arr[0] == "string" ||
            typeof arr[0] == "boolean" ||
            arr[0] === null
        ) {
            return true;
        } else {
            return false;
        }
    }

    /**
     * Converts an array to an object using array index as object keys