Method countNaNs

src/danfojs-base/shared/utils.ts:401–442

* Count the NaN and non-NaN values present in an array * @param arr Array object * @param val whether to return the value count instead of the null count * @param isSeries Whether the array is of type series or not

(arr: ArrayType1D | ArrayType2D, returnVal: boolean = true, isSeries: boolean)

     * @param isSeries Whether the array is of type series or not
     */
    countNaNs(arr: ArrayType1D | ArrayType2D, returnVal: boolean = true, isSeries: boolean): number | Array<number> {
        if (isSeries) {
            let nullCount = 0;
            let valCount = 0;
            for (let i = 0; i < arr.length; i++) {
                const ele = arr[i];
                if (Number.isNaN(ele)) {
                    nullCount = nullCount + 1;
                } else {
                    valCount = valCount + 1;
                }

            }
            if (returnVal) {
                return valCount;
            } else {
                return nullCount;
            }
        } else {
            const resultArr = [];
            for (let i = 0; i < arr.length; i++) {
                const innerArr = arr[i];
                let nullCount = 0;
                let valCount = 0;
                for (let i = 0; i < (innerArr as unknown as ArrayType2D).length; i++) {
                    const ele = (innerArr as unknown as ArrayType2D)[i];
                    if (Number.isNaN(ele)) {
                        nullCount = nullCount + 1;
                    } else {
                        valCount = valCount + 1;
                    }
                }

                if (returnVal) {
                    resultArr.push(valCount);
                } else {
                    resultArr.push(nullCount);
                }
            }
            return resultArr;
        }
    }

    /**
     * Round elements of an array or array of arrays to specified dp