This link has been bookmarked by 322 people . It was first bookmarked on 23 May 2006, by Keita Yamaguchi.
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Private members are made by the constructor. Ordinary vars and parameters of the constructor becomes the private members.
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This constructor makes three private instance variables: param, secret, and that. They are attached to the object, but they are not accessible to the outside, nor are they accessible to the object's own public methods. They are accessible to private methods.
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11 Jan 16
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The members of an object are all public members
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This technique is usually used to initialize public instance variables
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This technique is usually used to add public methods
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Private members are made by the constructor. Ordinary vars and parameters of the constructor becomes the private members.
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they are not accessible to the outside, nor are they accessible to the object's own public methods
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rivate methods are inner functions of the constructor.
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To make private methods useful, we need to introduce a privileged method.
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Private methods cannot be called by public methods.
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A privileged method is able to access the private variables and methods, and is itself accessible to the public methods and the outside
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What this means is that an inner function always has access to the vars and parameters of its outer function, even after the outer function has returned
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19 Oct 15
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10 Jun 15
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The names are strings, and the values are strings, numbers, booleans, and objects (including arrays and functions).
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Objects are collections of name-value pairs.
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JavaScript is fundamentally about objects. Arrays are objects. Functions are objects. Objects are objects. So what are objects?
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Objects are usually implemented as hashtables so values can be retrieved quickly.
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If a value is a function, we can consider it a method. When a method of an object is invoked, the this variable is set to the object. The method can then access the instance variables through the this variable.
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Public
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There are two main ways of putting members in a new object:
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The members of an object are all public members. Any function can access, modify, or delete those members, or add new members.
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In the constructor
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This technique is usually used to initialize public instance variables.
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In the prototype
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This technique is usually used to add public methods.
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Private
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Private members are made by the constructor. Ordinary vars and parameters of the constructor becomes the private members.
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This constructor makes three private instance variables: param, secret, and that. They are attached to the object, but they are not accessible to the outside,
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nor are they accessible to the object's own public methods.
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They are accessible to private methods. Private methods are inner functions of the constructor.
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By convention, we make a private that variable. This is used to make the object available to the private methods.
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Private methods cannot be called by public methods. To make private methods useful, we need to introduce a privileged method.
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A privileged method is able to access the private variables and methods, and is itself accessible to the public methods and the outside.
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It is possible to delete or replace a privileged method, but it is not possible to alter it, or to force it to give up its secrets.
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Privileged methods are assigned with this within the constructor.
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Private and privileged members can only be made when an object is constructed. Public members can be added at any time.
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Patterns
Public
function Constructor(...) {
this.membername = value;
}
Constructor.prototype.membername = value;Private
function Constructor(...) {
var that = this;
var membername = value;function membername(...) {...}
}
Note: The function statement
function membername(...) {...}
is shorthand for
var membername = function membername(...) {...};
Privileged
function Constructor(...) {
this.membername = function (...) {...};
}
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16 May 15
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15 May 15
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Arrays are objects. Functions are objects. Objects are objects.
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Objects are usually implemented as hashtables so values can be retrieved quickly
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To add a method to all objects made by a constructor, add a function to the constructor's prototype
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Private members are made by the constructor.
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Private methods are inner functions of the constructor.
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A privileged method is able to access the private variables and methods, and is itself accessible to the public methods and the outside.
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What this means is that an inner function always has access to the vars and parameters of its outer function, even after the outer function has returned.
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10 Nov 14
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they are not accessible to the outside, nor are they accessible to the object's own public methods
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This constructor makes three private instance variables: param, secret, and that.
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Private methods are inner functions of the constructor.
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They are accessible to private methods.
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Private methods cannot be called by public methods.
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Privileged methods are assigned with this within the constructor.
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this.service = function () {
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23 Sep 14
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This pattern of public, private, and privileged members is possible because JavaScript has closures. What this means is that an inner function always has access to the vars and parameters of its outer function, even after the outer function has returned. This is an extremely powerful property of the language. There is no book currently available on JavaScript programming that shows how to exploit it. Most don't even mention it.
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18 Jul 14
kolan29"Closures
This pattern of public, private, and privileged members is possible because JavaScript has closures. What this means is that an inner function always has access to the vars and parameters of its outer function, even after the outer function has returned. This is an extremely powerful property of the language. There is no book currently available on JavaScript programming that shows how to exploit it. Most don't even mention it.
Private and privileged members can only be made when an object is constructed. Public members can be added at any time." -
17 Jul 14
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By convention, we make a private that variable. This is used to make the object available to the private methods. This is a workaround for an error in the ECMAScript Language Specification which causes this to be set incorrectly for inner functions.
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A privileged method is able to access the private variables and methods, and is itself accessible to the public methods and the outside. It is possible to delete or replace a privileged method, but it is not possible to alter it, or to force it to give up its secrets.
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closures
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var that = this;
var membername = value;
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24 Feb 14
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30 Dec 13
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02 Dec 13
carlos puentes"Private Members in JavaScript"
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21 Oct 13
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05 Aug 13
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Objects are collections of name-value pairs.
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A privileged method is able to access the private variables and methods, and is itself accessible to the public methods and the outside. It is possible to delete or replace a privileged method, but it is not possible to alter it, or to force it to give up its secrets.
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hat this means is that an inner function always has access to the vars and parameters of its outer function, even after the outer function has returned. This is an extremely powerful property of the language.
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Note: The function statement
function membername(...) {...}
is shorthand for
var membername = function membername(...) {...};
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03 May 13
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08 Apr 13
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19 Oct 12
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JavaScript is the world's most misunderstood programming language. Some believe that it lacks the property of information hiding because objects cannot have private instance variables and methods. But this is a misunderstanding. JavaScript objects can have private members. Here's how.
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Private Members in JavaScript
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Hali PhaxA bit old, but still one of the best write-ups I've found with regard to objects in Javascript
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07 Jan 11
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19 Dec 10
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17 Dec 10
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24 Nov 10
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22 Nov 10
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04 Nov 10
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It is possible to delete or replace a privileged method, but it is not possible to alter it, or to force it to give up its secrets.
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Private and privileged members can only be made when an object is constructed. Public members can be added at any time.
-
Note: The function statement
function membername(...) {...}
is shorthand for
var membername = function membername(...) {...};
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01 Oct 10
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24 Sep 10
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22 Sep 10
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Arrays are objects. Functions are objects. Objects are objects. So what are objects?
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Objects are usually implemented as hashtables so values can be retrieved quickly.
-
Ordinary vars and parameters of the constructor becomes the private members.
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they accessible to the object's own public methods
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Private methods are inner functions of the constructor
-
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10 Sep 10
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Private
Private members are made by the constructor. Ordinary vars and parameters of the constructor becomes the private members.
function Container(param) { this.member = param; var secret = 3; var that = this; }This constructor makes three private instance variables: param, secret, and that. They are attached to the object, but they are not accessible to the outside, nor are they accessible to the object's own public methods. They are accessible to private methods. Private methods are inner functions of the constructor.
function Container(param) { function dec() { if (secret > 0) { secret -= 1; return true; } else { return false; } } this.member = param; var secret = 3; var that = this; }
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06 Jul 10
lnedadJavaScript is fundamentally about objects. Arrays are objects. Functions are objects. Objects are objects. So what are objects? Objects are collections of name-value pairs. The names are strings, and the values are strings, numbers, booleans, and objects
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20 May 10
Tyler HamiltonJavaScript is the world's most misunderstood programming language. Some believe that it lacks the property of information hiding because objects cannot have private instance variables and methods. But this is a misunderstanding. JavaScript objects can hav
development code javascript programming reference tips tutorial webdev crockford closures
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aleot aleotPrivate members are made by the constructor. Ordinary vars and parameters of the constructor becomes the private members.
By convention, we make a private that parameter. This is used to make the object available to the private methods. This is a workaroujavascript programming oop reference tutorial development webdev private js
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max jJavaScript is the world's most misunderstood programming language. Some believe that it lacks the property of information hiding because objects cannot have private instance variables and methods. But this is a misunderstanding. JavaScript objects can hav
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16 Sep 08
Ralph YoungSome believe that it lacks the property of information hiding because objects cannot have private instance variables and methods. But this is a misunderstanding. JavaScript objects can have private members. Here's how.
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13 Sep 08
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12 Sep 08
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bob dolanJavaScript is the world's most misunderstood programming language. Some believe that it lacks the property of information hiding because objects cannot have private instance variables and methods. But this is a misunderstanding. JavaScript objects can hav
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Carl CamposTutorial explaining advanced JavaScript functions
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