es-next-tools/dist/object/flatten.js

A comprehensive utility library for JavaScript and TypeScript that provides a wide range of functions for common programming tasks, including mathematical operations, date manipulations, array and object handling, string utilities, and more.

/**
 * Flattens a nested object structure.
 * @param {T} obj - The object to flatten.
 * @param {string} [prefix=''] - The prefix to use for flattened keys.
 * @returns A flattened version of the input object.
 * @example
 * const nestedObj = { a: 1, b: { c: 2, d: { e: 3 } } };
 * const flattenedObj = flatten(nestedObj);
 * // { 'a': 1, 'b.c': 2, 'b.d.e': 3 }
 */
export function flatten(obj, prefix = '') {
    return Object.keys(obj).reduce((acc, k) => {
        const pre = prefix.length ? prefix + '.' : '';
        if (typeof obj[k] === 'object' && obj[k] !== null && !Array.isArray(obj[k])) {
            Object.assign(acc, flatten(obj[k], pre + k));
        }
        else {
            acc[pre + k] = obj[k];
        }
        return acc;
    }, {});
}