When I go throw jquery.sap.global.js, there is PerfMeasurement class implementation. I am afraid there are two concerns in my mind.
Firstly there are two different patterns to implement a class, one is prototype pattern, such as Version:
function Version() {}
Version.prototype.InRange() {}The another pattern is constructor. Such as PerfMeasurement.
function PerfMeasurement() { this._start = function() {}; this.start = this['_start'];
}According to _start function name, it should be a private function. But we could access this private function.
> jQuery.sap.measure._start> function (sId, sInfo, aCategories) { if (!bActive) { return; } aCategories = checkCategories(aCategories); if (!aCategories) { return; } var iTime = jQuery.sap.now(…
Since private and public functions are defined in the same function scope, then private function could get function instance reference this, and public functions could access private functions. For example:
var JsClass = function(name) { var that = this; this.name = name; function _sayHello() { console.log('hello:', that.name); } this.say = function() { _sayHello(); };
}
var instanceOfJsClass = new JsClass('Mike');
console.log('name:', instanceOfJsClass.name);
instanceOfJsClass.say(); // Access public function
instanceofJsClass._sayHello(); // Can't access private function
In the same way, _start could be removed bind from function instance reference this. And then _start function become a real private function, and the same time it could be accessed by other public functions.