nl_tokens: Applies the function iterator to each item in arr in parallel .
pl_tokens: function each ( arr , <mask> ) { var wrapper = this ; if ( this . isAsync ) { return async . each ( arr , function ( item , cb ) { wrapper . call ( item , cb ) ; } , callback ) ; } else { arr . each ( function ( item ) { wrapper . call ( item ) ; } ) ; if ( callback ) { callback ( ) ; } } }