Javascript Closures - The Diigo Meta page

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  Closures are one of the most powerful features of ECMAScript (javascript) but they cannot be property exploited without understanding them. They are, however, relatively easy to create, even accidentally, and their creation has potentially harmful consequ

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  "A "closure" is an expression (typically a function) that can have free variables together with an environment that binds those variables (that "closes" the expression)."

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  Closures are one of the most powerful features of ECMAScript (javascript) but they cannot be property exploited without understanding them. They are, however, relatively easy to create, even accidentally, and their creation has potentially harmful consequ

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  Closure Definition: A "closure" is an expression (typically a function) that can have free variables together with an environment that binds those variables (that "closes" the expression).
  Closures are one of the most powerful features of ECMAScript (java

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  A "closure" is an expression (typically a function) that can have free variables together with an environment that binds those variables (that "closes" the expression).

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  • If a value is assigned and the actual object does not have a property with the corresponding name a property of that name is created and the value is assigned to it. If it has the property then its value is re-set.
  • all objects may have prototypes, and prototypes are objects so they, in turn, may have prototypes, which may have prototypes, and so on forming what is called the prototype chain. The prototype chain ends when one of the objects in the chain has a null prototype. The default prototype for the Object constructor has a null prototype so
  • When a javascript function is called it enters an execution context, if another function is called (or the same function recursively) a new execution context is created and execution enters that context for the duration of the function call. Returning to the original execution context when that called function returns. Thus running javascript code forms a stack of execution contexts
  • First, in the execution context of a function, an "Activation" object is created.
  • The next step in the creation of the execution context for a function call is the creation of an arguments object, which is an array-like object with integer indexed members corresponding with the arguments passed to the function call, in order.
  • Next the execution context is assigned a scope. A scope consists of a list (or chain) of objects.
  • the Activation object is used as the Variable object (note this, it is important: they are the same object). Named properties of the Variable object are created for each of the function's formal parameters, and if arguments to the function call correspond with those parameters the values of those arguments are assigned to the properties (otherwise the assigned value is undefined)
  • It is the fact that the Activation object, with its arguments property, and the Variable object, with named properties corresponding with function local variables, are the same object, that allows the identifier arguments to be treated as if it was a function local variable.

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  Известная статья, исчерпывающе объясняющая замыкания в JavaScript

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  • The simple explanation of a Closure is that ECMAScript allows inner functions; function definitions and function expressions that are inside the function bodes of other functions. And that those inner functions are allowed access to all of the local variables, parameters and declared inner functions within their outer function(s).
  • The simple explanation of a Closure is that ECMAScript allows inner functions; function definitions and function expressions that are inside the function bodes of other functions. And that those inner functions are allowed access to all of the local variables, parameters and declared inner functions within their outer function(s). A closure is formed when one of those inner functions is made accessible outside of the function in which it was contained, so that it may be executed after the outer function has returned. At which point it still has access to the local variables, parameters and inner function declarations of its outer function. Those local variables, parameter and function declarations (initially) have the values that they had when the outer function returned and may be interacted with by the inner function.
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  * Written by Richard Cornford. March 2004.
  * With corrections and suggestions by:-
  o Martin Honnen.
  o Yann-Erwan Perio (Yep).
  o Lasse Reichstein Nielsen. (definition of closure)
  o Mike Scirocco.
  

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