Method replaceUndefinedWithNaN

src/danfojs-base/shared/utils.ts:215–254

* Replaces all missing values with NaN. Missing values are undefined, Null and Infinity * @param arr The array * @param isSeries Whether the arr is a series or not

(arr: ArrayType1D | ArrayType2D, isSeries: boolean)

     * @param isSeries Whether the arr is a series or not
     */
    replaceUndefinedWithNaN(arr: ArrayType1D | ArrayType2D, isSeries: boolean): ArrayType1D | ArrayType2D {
        if (arr.length === 0) return arr;

        if (isSeries && Array.isArray(arr)) {
            const newArr = arr.map((ele) => {
                if (typeof ele === "undefined") {
                    return NaN;
                }
                if (typeof ele === "number" && (isNaN(ele) || ele == Infinity)) {
                    return NaN;
                }
                if (ele == null) {
                    return NaN;
                }
                return ele
            });
            return newArr as ArrayType1D
        } else {
            const newArr = []
            if (Array.isArray(arr)) {
                for (let i = 0; i < arr.length; i++) {
                    const innerArr = arr[i]
                    const temp = (innerArr as unknown as ArrayType2D).map((ele: any) => {
                        if (typeof ele === "undefined") {
                            return NaN;
                        }
                        if (typeof ele === "number" && (isNaN(ele) || ele == Infinity)) {
                            return NaN;
                        }
                        if (ele == null) {
                            return NaN;
                        }
                        return ele
                    });
                    newArr.push(temp);
                }
            }
            return newArr;
        }
    }

    /**
     * Infer data type from an array or array of arrays