src/reducers/map.js
function removeFeatures(state, action) {
  // short hand the source source and the data
  const source = state.sources[action.sourceName];
  if (!source) {
    return state;
  }
  const data = source.data;

  // filter function, features which MATCH this function will be REMOVED.
  const match = createFilter(action.filter);

  if (data.type === 'Feature') {
    // if the feature should be removed, return an empty
    //  FeatureCollection
    if (match(undefined, data)) {
      return changeData(state, action.sourceName, {
        type: 'FeatureCollection',
        features: [],
      });
    }
  } else if (data.type === 'FeatureCollection') {
    const new_features = [];
    for (let i = 0, ii = data.features.length; i < ii; i++) {
      const feature = data.features[i];
      if (!match(undefined, feature)) {
        new_features.push(feature);
      }
    }

    const new_data = Object.assign({},
      data,
      {features: new_features},
    );

    return changeData(state, action.sourceName, new_data);
  }

  return state;
}
function removeFeatures(state, action) {
  // short hand the source source and the data
  const source = state.sources[action.sourceName];
  if (!source) {
    return state;
  }
  const data = source.data;

  // filter function, features which MATCH this function will be REMOVED.
  const match = createFilter(action.filter);

  if (data.type === 'Feature') {
    // if the feature should be removed, return an empty
    //  FeatureCollection
    if (match(undefined, data)) {
      return changeData(state, action.sourceName, {
        type: 'FeatureCollection',
        features: [],
      });
    }
  } else if (data.type === 'FeatureCollection') {
    const new_features = [];
    for (let i = 0, ii = data.features.length; i < ii; i++) {
      const feature = data.features[i];
      if (!match(undefined, feature)) {
        new_features.push(feature);
      }
    }

    const new_data = Object.assign({},
      data,
      {features: new_features},
    );

    return changeData(state, action.sourceName, new_data);
  }

  return state;
}
function removeFeatures ( state , action ) { // short hand the source source and the data const source = state . sources [ action . sourceName ] ; if ( ! source ) { return state ; } const data = source . data ; // filter function, features which MATCH this function will be REMOVED. const match = createFilter ( action . filter ) ; if ( data . type === 'Feature' ) { // if the feature should be removed, return an empty //  FeatureCollection if ( match ( undefined , data ) ) { return changeData ( state , action . sourceName , { type : 'FeatureCollection' , features : [ ] , } ) ; } } else if ( data . type === 'FeatureCollection' ) { const new_features = [ ] ; for ( let i = 0 , ii = data . features . length ; i < ii ; i ++ ) { const feature = data . features [ i ] ; if ( ! match ( undefined , feature ) ) { new_features . push ( feature ) ; } } const new_data = Object . assign ( { } , data , { features : new_features } , ) ; return changeData ( state , action . sourceName , new_data ) ; } return state ; }
Remove features from a source.
The action should define a filter, any feature
matching the filter will be removed.
@param {Object} state Current state.
@param {Object} action Action to handle.

@returns {Object} The new state.
Remove features from a source . The action should define a filter any feature matching the filter will be removed . @param { Object } state Current state . @param { Object } action Action to handle .