Method concat

src/danfojs-base/core/strings.ts:196–239

(other: Array<string> | string, position = 1, options?: { inplace?: boolean })

    */
    concat(other: Array<string> | string, position: number, options?: { inplace?: boolean }): Series
    concat(other: Array<string> | string, position = 1, options?: { inplace?: boolean }): Series | void {
        const { inplace } = { inplace: false, ...options }
        const newArr: Array<string | number> = [];

        if (Array.isArray(other)) {
            for (let i = 0; i < other.length; i++) {
                let leftStr = `${this.values[i]}`;
                let rightStr = `${other[i]}`;
                if (position == 1) {
                    newArr.push(leftStr.concat(rightStr));
                } else {
                    newArr.push(rightStr.concat(leftStr));
                }

            }
        } else {
            this.values.map((val) => {
                if (position == 1) {
                    if (utils.isEmpty(val)) {
                        newArr.push(NaN);
                    } else {
                        newArr.push(`${val}`.concat(`${other}`));
                    }

                } else {
                    if (utils.isEmpty(val)) {
                        newArr.push(NaN);
                    } else {
                        newArr.push(other.concat(`${val}`));
                    }
                }
            });
        }

        if (inplace) {
            this.series.$setValues(newArr as ArrayType1D)
            this.series.print()
        } else {
            const sf = this.series.copy()
            sf.$setValues(newArr as ArrayType1D)
            return sf;
        }

    }


    /**