Util function to convert CSV into an array of objects

csvToArray.ts

const isEmptyString = <T>(value: string | T): boolean =>
    typeof value !== 'string' || !value?.trim()?.length;

const csvToArray = (csvString: string, delimiter: string = ','): Array<any> => {
    if (isEmptyString(csvString)) return [];

    /*
    get the first piece of string by slicing the string till the first new line character is encountered
    split the sliced string about the delimiter to get the list of headers
    */
    const headers = csvString.slice(0, csvString.indexOf('\n')).split(delimiter);

    /*
    get the rows of data by splitting the remaining string about the new line character
    */
    const dataRows = csvString.slice(csvString.indexOf('\n') + 1).split('\n');

    /*
    split each row about the delimiter to get an array of values
    iterate over the headers to create key-value pairs of each header along with the corresponding value
    add these objects to the required array
    */
    const resultingArray = dataRows.map((row: string) => {
        const rowValues: Array<string> = row.split(delimiter);
        const headerValueMapping = headers.reduce((
            accumulatedMapping: {[key: string]: string}, currentHeader: string, index: number,
        ) => {
            accumulatedMapping[currentHeader] = rowValues[index];
            return accumulatedMapping;
        }, {});

        return headerValueMapping;
    });

    return resultingArray;
};

/*

Example

try {
    const csvData = fs.readFileSync('./sample.csv', 'utf8'); // type of csvData is string
    const resultingArray = csvToArray(csvData);
    fs.writeFileSync('./sample.json', JSON.stringify({ data: resultingArray }));
} catch (err) {
    console.log(err);
}

*/