I rephrased another user's JavaScript code.

BEFORE:

function SomeObj(flag) {
    var _private = true;
    this.flag = (flag) ? true : false;
    this.version="1.1 (prototype)";
    if (!this._someProperty) this._init();
            // leading underscore hints at what should be a 'private' to me
    this.reset(); // assumes reset has been added...
}

SomeObj.prototype.reset = function() {
    /* perform some actions */
}

/* UPDATE */
SomeObj.prototype.getPrivate = function() {
    return _private; // will return undefined
}

/* ...several other functions appended via `prototype`...*/

AFTER:

var SomeObj = function (flag) {
    var _private = true;
    this.flag = (flag) ? true : false;
    this.version = "2.0 (constructor)";

    this.reset = function () {
       /* perform some actions */
    };

    /* UPDATE */
    this.getPrivate = function() {
        return _private; // will return true
    }

    /* other functions and function calls here */
}

For me, the first example seems difficult to read, especially in a wider context. Adding methods such resetas this using a property prototypeseems to be much less controllable since it could supposedly happen anywhere in the script. My reorganized code (second example above) looks a lot neater for me, and therefore it is easier to read because it is self-sufficient. I got some privacy with variable declarations, but I lost prototype capabilities.

...

QUESTIONS:

• -, , , prototype, . 6 , , prototype , .

• new; "" --. , var, , , , , , ( ) , . - :

  var SomeObj = (function () {
  
      /* all the stuff mentioned above, declared as 'private' `var`s */
  
      /* UPDATE */
      var getPrivate = function () {
          return private;
      }
  
      var expose = function (flag) {
           // just returns `flag` for now
           // but could expose other properties
           return {
               flag: flag || false, // flag from argument, or default value
               getPrivate: getPrivate
           } 
      };
  
      return {
          expose: expose
      }
  })(); // IIFE
  
  // instead of having to write `var whatever = new SomeObj(true);` use...
  var whatever = SomeObj.expose();
  

  StackOverflow, " " ( , ). , prototype, , new (, instanceof). , - new?

• , , , : prototype new , ( , ), , - ?

...

UPDATE:

, expose , . , , SomeObj, ( ). flag ( ) expose, . , , ( ?).

, 2: , - new?

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