lib/core.js
function filterDataItem(item){
    return this.filters.some(function(filter){
      return filter.call(null, item);
    }) ? item : null;
  }
function filterDataItem(item){
    return this.filters.some(function(filter){
      return filter.call(null, item);
    }) ? item : null;
  }
function filterDataItem ( item ) { return this . filters . some ( function ( filter ) { return filter . call ( null , item ) ; } ) ? item : null ; }
Filters out any time series value which does not satisfy the filter.

@param item {Number}
@returns {Boolean}
Filters out any time series value which does not satisfy the filter .