dist/u.packed.js
function(filter) {
      return u(array.filter.call(this, function(el, index) {
        return /^f/.test(typeof filter) ? filter(index, el) : u(el).is(filter);
      }));
    }
function(filter) {
      return u(array.filter.call(this, function(el, index) {
        return /^f/.test(typeof filter) ? filter(index, el) : u(el).is(filter);
      }));
    }
function ( filter ) { return u ( array . filter . call ( this , function ( el , index ) { return / ^f / . test ( typeof filter ) ? filter ( index , el ) : u ( el ) . is ( filter ) ; } ) ) ; }
filter method
filter elements by selector or filter function
@param  {string|function} filter - selector or filter function
@return {object}                   matching elements
filter method filter elements by selector or filter function