Method fillNa

src/danfojs-base/core/frame.ts:2095–2174

(
        values: number | string | boolean | ArrayType1D,
        options?:
            {
                columns?: Array<string>,
                inplace?: boolean
            }
    )

            }
    ): DataFrame
    fillNa(
        values: number | string | boolean | ArrayType1D,
        options?:
            {
                columns?: Array<string>,
                inplace?: boolean
            }
    ): DataFrame | void {
        let { columns, inplace } = { inplace: false, ...options }

        if (!values && typeof values !== "boolean" && typeof values !== "number" && typeof values !== "string") {
            throw Error('ParamError: value must be specified');
        }

        if (Array.isArray(values)) {
            if (!Array.isArray(columns)) {
                throw Error('ParamError: value is an array, hence columns must also be an array of same length');
            }

            if (values.length !== columns.length) {
                throw Error('ParamError: specified column and values must have the same length');
            }

            columns.forEach((col) => {
                if (!this.columns.includes(col)) {
                    throw Error(
                        `ValueError: Specified column "${col}" must be one of ${this.columns}`
                    );
                }
            });
        }

        const newData = []
        const oldValues = [...this.values]

        if (!columns) {
            //Fill all columns
            for (let i = 0; i < oldValues.length; i++) {
                const valueArr = [...oldValues[i] as ArrayType1D]

                const tempArr = valueArr.map((innerVal) => {
                    if (utils.isEmpty(innerVal)) {
                        const replaceWith = Array.isArray(values) ? values[i] : values
                        return replaceWith
                    } else {
                        return innerVal
                    }
                })
                newData.push(tempArr)
            }

        } else {
            //Fill specific columns
            const tempData = [...this.values]

            for (let i = 0; i < tempData.length; i++) {
                const valueArr = tempData[i] as ArrayType1D