reusable-react-redux/src/deep-state-merge.js

Library to facilitate building reusable react redux components.

const stateMerge = require('./state-merge.js');

/*
 * Utility method
 * Create a new state object with a specific (deeply nested) state slice modified.
 */
module.exports = function deepStateMerge(state, statePath, nextLocalState) {
  if (statePath.length === 0) return nextLocalState;

  // In order to set a new deeply nested state
  // Recursively create new state objects along the statePath path
  return stateMerge(
    state,
    statePath[0],
    statePath.length === 1 ?
      nextLocalState :
      deepStateMerge(state[statePath[0]], statePath.slice(1), nextLocalState)
  );
}