src/reducers/map.js
function setVisibility(state, action) {
  let updated = false;
  const updated_layers = [];

  for (let i = 0, ii = state.layers.length; i < ii; i++) {
    const layer = state.layers[i];
    if (layer.id === action.layerId) {
      updated_layers.push({
        ...layer,
        layout: {
          ...layer.layout,
          visibility: action.visibility,
        },
      });
      updated = true;
    } else {
      updated_layers.push(layer);
    }
  }
  if (updated) {
    return Object.assign({}, state, {
      layers: updated_layers,
    }, incrementVersion(state.metadata, LAYER_VERSION_KEY));
  }
  // if nothing was updated, return the default state.
  return state;
}
function setVisibility(state, action) {
  let updated = false;
  const updated_layers = [];

  for (let i = 0, ii = state.layers.length; i < ii; i++) {
    const layer = state.layers[i];
    if (layer.id === action.layerId) {
      updated_layers.push({
        ...layer,
        layout: {
          ...layer.layout,
          visibility: action.visibility,
        },
      });
      updated = true;
    } else {
      updated_layers.push(layer);
    }
  }
  if (updated) {
    return Object.assign({}, state, {
      layers: updated_layers,
    }, incrementVersion(state.metadata, LAYER_VERSION_KEY));
  }
  // if nothing was updated, return the default state.
  return state;
}
function setVisibility ( state , action ) { let updated = false ; const updated_layers = [ ] ; for ( let i = 0 , ii = state . layers . length ; i < ii ; i ++ ) { const layer = state . layers [ i ] ; if ( layer . id === action . layerId ) { updated_layers . push ( { ... layer , layout : { ... layer . layout , visibility : action . visibility , } , } ) ; updated = true ; } else { updated_layers . push ( layer ) ; } } if ( updated ) { return Object . assign ( { } , state , { layers : updated_layers , } , incrementVersion ( state . metadata , LAYER_VERSION_KEY ) ) ; } // if nothing was updated, return the default state. return state ; }
Change the visibility of a layer given in the action.
@param {Object} state Current state.
@param {Object} action Action to handle.

@returns {Object} The new state.
Change the visibility of a layer given in the action . @param { Object } state Current state . @param { Object } action Action to handle .