react-window/src/shallowDiffers.js

React components for efficiently rendering large, scrollable lists and tabular data

// @flow

// Pulled from react-compat
// https://github.com/developit/preact-compat/blob/7c5de00e7c85e2ffd011bf3af02899b63f699d3a/src/index.js#L349
export default function shallowDiffers(prev: Object, next: Object): boolean {
  for (let attribute in prev) {
    if (!(attribute in next)) {
      return true;
    }
  }
  for (let attribute in next) {
    if (prev[attribute] !== next[attribute]) {
      return true;
    }
  }
  return false;
}