@react-navigation/stack/lib/module/utils/memoize.js

Stack navigator component for iOS and Android with animated transitions and gestures

export default function memoize(callback) {
  let previous;
  let result;
  return function () {
    let hasChanged = false;
    for (var _len = arguments.length, dependencies = new Array(_len), _key = 0; _key < _len; _key++) {
      dependencies[_key] = arguments[_key];
    }
    if (previous) {
      if (previous.length !== dependencies.length) {
        hasChanged = true;
      } else {
        for (let i = 0; i < previous.length; i++) {
          if (previous[i] !== dependencies[i]) {
            hasChanged = true;
            break;
          }
        }
      }
    } else {
      hasChanged = true;
    }
    previous = dependencies;
    if (hasChanged || result === undefined) {
      result = callback(...dependencies);
    }
    return result;
  };
}
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