src/js/pagination/paging-collection.js
function(fieldName) {
                return _.has(this.filterableFields, fieldName) &&
                    !_.isUndefined(this.filterableFields[fieldName].displayName);
            }
function(fieldName) {
                return _.has(this.filterableFields, fieldName) &&
                    !_.isUndefined(this.filterableFields[fieldName].displayName);
            }
function ( fieldName ) { return _ . has ( this . filterableFields , fieldName ) && ! _ . isUndefined ( this . filterableFields [ fieldName ] . displayName ) ; }
Returns whether this collection has defined a given
filterable field.

@param fieldName {string} querystring parameter name for the
filterable field
@return {boolean} Returns true if this collection has the specified field.
Returns whether this collection has defined a given filterable field .