Method setIndex

src/danfojs-base/core/frame.ts:2418–2490

(
        options:
            {
                index?: Array<number | string | (number | string)>,
                column?: string,
                drop?: boolean,
                inplace?: boolean
            }
    )

            }
    ): DataFrame
    setIndex(
        options:
            {
                index?: Array<number | string | (number | string)>,
                column?: string,
                drop?: boolean,
                inplace?: boolean
            }
    ): DataFrame | void {
        const { index, column, drop, inplace } = { drop: false, inplace: false, ...options }

        if (!index && !column) {
            throw new Error("ParamError: must specify either index or column")
        }

        let newIndex: Array<string | number> = [];

        if (index) {
            if (!Array.isArray(index)) {
                throw Error(`ParamError: index must be an array`);
            }

            if (index.length !== this.values.length) {
                throw Error(`ParamError: index must be the same length as the number of rows`);
            }
            newIndex = index;
        }

        if (column) {
            if (this.columns.indexOf(column) === -1) {
                throw Error(`ParamError: column not found in column names`);
            }

            newIndex = this.$getColumnData(column, false) as Array<string | number>
        }

        if (drop) {
            const dfDropped = this.drop({ columns: [column as string] })

            const newData = dfDropped?.values as ArrayType2D
            const newColumns = dfDropped?.columns
            const newDtypes = dfDropped?.dtypes

            if (inplace) {
                this.$setValues(newData, true, false)
                this.$setIndex(newIndex)
                this.$setColumnNames(newColumns)
            } else {
                const df = new DataFrame(newData,
                    {
                        index: newIndex,
                        columns: newColumns,
                        dtypes: newDtypes,
                        config: { ...this.config }
                    });
                return df;
            }
        } else {