Method capitalize

src/danfojs-base/core/strings.ts:119–143

(options?: { inplace?: boolean })

    */
    capitalize(options?: { inplace?: boolean }): Series
    capitalize(options?: { inplace?: boolean }): Series | void {
        const { inplace } = { inplace: false, ...options }
        const newArr: Array<string | number> = [];
        this.values.map((val) => {
            if (utils.isEmpty(val)) {
                newArr.push(NaN);
            } else {
                let firstChar = `${val}`.slice(0, 1);
                let leftChar = `${val}`.slice(1);
                let newStr = `${firstChar.toUpperCase()}${leftChar.toLowerCase()}`;
                newArr.push(newStr);
            }

        });

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

    }

    /**
     * Returns the character at the specified index (position)