sigma/src/utils.ts

/**
 * Sigma.js Utils
 * ===============
 *
 * Various helper functions & classes used throughout the library.
 */

/**
 * Checks whether the given value is a plain object.
 *
 * @param  {mixed}   value - Target value.
 * @return {boolean}
 */
export function isPlainObject(value: any): boolean {
  return typeof value === "object" && value !== null && value.constructor === Object;
}

/**
 * Very simple recursive Object.assign-like function.
 *
 * @param  {object} target       - First object.
 * @param  {object} [...objects] - Objects to merge.
 * @return {object}
 */
export function assign(target: object, ...objects): object {
  target = target || {};

  for (let i = 0, l = objects.length; i < l; i++) {
    const o = objects[i];

    if (!o) continue;

    for (const k in o) {
      if (isPlainObject(o[k])) {
        target[k] = assign(target[k], o[k]);
      } else {
        target[k] = o[k];
      }
    }
  }

  return target;
}