How to pass variables to other functions inside object in javascript -

var mycar2 = {      maxspeed: 70,     driver: "arnold",      drive: function(speed, time) {         console.log("speed " + (speed * time));     },      logbook: function(a , b) {               console.log("max speed " + this.maxspeed + " " + this.drive(a , b));     } };  mycar2.logbook(3 , 6); 

if run code this.drive(a , b) undefined. how can pass variables drive() function using logbook()?

you passing variables drive, , defined within it. if weren't wouldn't speed 18 in output, speed nan.

the undefined value return value of drive, because haven't put return statement in function.