Handy function to get some summarization from a js array

summarizeProperties.js

window.summarizeProperties = (data, excluded = []) => {
    const result = {};

    data.forEach(obj => {
        for (const key in obj) {
            if (excluded.indexOf(key) === -1) {
                let value = obj[key];
                let valueIsDate = false;

                // Check if the value is a date
                if (typeof value === 'string' && !isNaN(Date.parse(value))) {
                    valueIsDate = true;
                }

                if (!result[key]) {
                    if (typeof value === 'number' || valueIsDate) {
                        result[key] = { min: valueIsDate ? new Date(value) : value, max: valueIsDate ? new Date(value) : value };
                    } else {
                        result[key] = new Set();
                    }
                }

                if (result[key] instanceof Set) {
                    result[key].add(value || '');
                } else {
                    // Handle updating min/max for dates and numbers
                    if (valueIsDate) {
                        value = new Date(value);
                        if (value < result[key].min) {
                            result[key].min = value;
                        }
                        if (value > result[key].max) {
                            result[key].max = value;
                        }
                    } else if (typeof value === 'number') {
                        if (value < result[key].min) {
                            result[key].min = value;
                        }
                        if (value > result[key].max) {
                            result[key].max = value;
                        }
                    }
                }
            }
        }
    });

    // Convert all Sets to arrays
    for (const key in result) {
        if (result[key] instanceof Set) {
            result[key] = Array.from(result[key]);
        } else {
            // Ensure date objects are converted to readable strings or kept as Date objects based on your preference
            result[key].min = result[key].min instanceof Date ? result[key].min.toISOString() : result[key].min;
            result[key].max = result[key].max instanceof Date ? result[key].max.toISOString() : result[key].max;
        }
    }

    return result;
}