gorge/util.js

function replaceChildren(element, newChildren) {
  removeChildren(element);
  addChildren(element, newChildren);
}

function addChildren(element, children) {
  for (let child of children) {
    element.appendChild(child);
  }
}

function removeChildren(element) {
  while (element.lastChild) {
    element.removeChild(element.lastChild);
  }
}

function round(val, places = 0) {
  return Math.round(val * Math.pow(10, places)) / Math.pow(10, places);
}

function mapObject(obj, func) {
  return deepFreeze(Object.keys(obj).reduce((o, k) => ({ ...o, [k]: func(obj[k])}), {}));
}

function deepFreeze(object) {

  // Retrieve the property names defined on object
  var propNames = Object.getOwnPropertyNames(object);

  // Freeze properties before freezing self
  
  for (let name of propNames) {
    let value = object[name];

    object[name] = value && typeof value === "object" ? 
      deepFreeze(value) : value;
  }

  return Object.freeze(object);
}