Method $setColumnData

src/danfojs-base/core/frame.ts:145–186

* Updates the internal column data via column name. * @param column The name of the column to update. * @param arr The new column data

(column: string, arr: ArrayType1D | Series)

     * @param arr The new column data
     */
    private $setColumnData(column: string, arr: ArrayType1D | Series): void {

        const columnIndex = this.$columns.indexOf(column)

        if (columnIndex == -1) {
            throw new Error(`ParamError: column ${column} not found in ${this.$columns}. If you need to add a new column, use the df.addColumn method. `)
        }

        let colunmValuesToAdd: ArrayType1D

        if (arr instanceof Series) {
            colunmValuesToAdd = arr.values as ArrayType1D
        } else if (Array.isArray(arr)) {
            colunmValuesToAdd = arr;
        } else {
            throw new Error("ParamError: specified value not supported. It must either be an Array or a Series of the same length")
        }

        if (colunmValuesToAdd.length !== this.shape[0]) {
            ErrorThrower.throwColumnLengthError(this, colunmValuesToAdd.length)
        }

        if (this.$config.isLowMemoryMode) {
            //Update row ($data) array
            for (let i = 0; i < this.$data.length; i++) {
                (this.$data as any)[i][columnIndex] = colunmValuesToAdd[i]
            }
            //Update the dtypes
            this.$dtypes[columnIndex] = utils.inferDtype(colunmValuesToAdd)[0]
        } else {
            //Update row ($data) array
            for (let i = 0; i < this.values.length; i++) {
                (this.$data as any)[i][columnIndex] = colunmValuesToAdd[i]
            }
            //Update column ($dataIncolumnFormat) array since it's available in object
            (this.$dataIncolumnFormat as any)[columnIndex] = arr

            //Update the dtypes
            this.$dtypes[columnIndex] = utils.inferDtype(colunmValuesToAdd)[0]
        }

    }

    /**
     * Return data with missing values removed from a specified axis