_README.md

Very simple snippet to export a set of objects, into:

• an array of values
• tsv
• html table

createTSV.js

/**
 * Determine a list of header fields from a collection of objects.
 * @param {Object[]} objectCollection - collection of objects to create the table from.
 * @return {String[]} - list of headers to include
 **/
table_headersFromObject = (objectCollection) => {
    const cleanCollection = (objectCollection || []).filter(r => r);

    const headerSet = new Set();
    for (const obj of cleanCollection) {
        if (obj) {
            Object.keys(obj).map((key) => headerSet.add(key));
        }
    }
    return Array.from(headerSet);
}

table_printRow = (headerArray) => {
    return (headerArray || []).join('\t');
}

table_arrayFromObject = (objectCollection, headers = null) => {
    const cleanHeaders = headers === null
        ? table_headersFromObject(objectCollection)
        : headers;

    const results = [];
    (objectCollection || []).forEach((obj) => {
        const cleanObj = obj || {};
        results.push(cleanHeaders.map((field) => obj[field]));
    });
    
    return results;
};

table_tsv = (valueArray, headers) => ([headers, ...valueArray])
    .map(table_printRow)
    .join('\n');

table_tsvFromObjects = (objectCollection, headers) => {
    const cleanHeaders = headers || table_headersFromObject(objectCollection);
    const valueArray = table_arrayFromObject(objectCollection, cleanHeaders);
    return table_tsv(valueArray, cleanHeaders);
};

table_htmlHeaders = (headers) => `<tr>${headers.map(h => `<th>${h}</th>`)}</tr>`;
table_htmlValueRow = (valueArray) => `<tr>${valueArray.map(v => `<td>${v}</td>`)}</tr>`;
table_htmlValues = (valueArray) => valueArray.map(table_htmlValueRow);

table_html = (valueArray, headers) => `<table>${table_htmlHeaders(headers)}${table_htmlValues(valueArray)}</table>`;

table_htmlFromObjects = (objectCollection, headers) => {
    const cleanHeaders = headers || table_headersFromObject(objectCollection);
    const valueArray = table_arrayFromObject(objectCollection, cleanHeaders);
    return table_html(valueArray, cleanHeaders);
}