Javascript OOP - Function within return function -

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trying create function call called if other function has been called within same line.

var processtrack = new function() {     this.current = 1;     this.max = 5800;     this.min = 0;     this.done = function(started, processing, cur, len) {         cur = cur || 0;         len = len || 1;         var res = 0;         if (started && !processing)             res = ((this.current - 1 - this.min) / (this.max - this.min)).tofixed(2);         else if (!started && processing)             res = (this.done(true, false) + (this.step() * this.cur / this.len)).tofixed(2);         else if (!started && !processing)             res = ((++this.current - 1 - this.min) / (this.max - this.min)).tofixed(2);          this.percentage = function() {             return res * 100 + "%";         };         return res;     };     this.step = function() {         return 1 / (this.max - this.min);     }; }

what ideally want call processtrack.done(args).percentage() percentage data recieved .done(args), whenever try call (for example) processtrack.done(true, false).percentage() gives me error saying:

typeerror: processtrack.done(...).percentage not function

what doing wrong?

you need return this instead of res @ end of this.done function. returning this, returning this.done function, object has percentage function in it.

the following code runs without errors:

var processtrack = new function() {     this.current = 1;     this.max = 5800;     this.min = 0;     this.done = function(started, processing, cur, len) {         cur = cur || 0;         len = len || 1;         var res = 0;         if (started && !processing)             res = ((this.current - 1 - this.min) / (this.max - this.min)).tofixed(2);         else if (!started && processing)             res = (this.done(true, false) + (this.step() * this.cur / this.len)).tofixed(2);         else if (!started && !processing)             res = ((++this.current - 1 - this.min) / (this.max - this.min)).tofixed(2);          this.percentage = function() {             return res * 100 + "%";         };         return this;     };     this.step = function() {         return 1 / (this.max - this.min);     }; }  processtrack.done(true, false).percentage();

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