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Closures - JavaScript
in javascript, closures are created every time a function is created, at function creation time.
... the reason is that functions in javascript form closures.
... add5 and add10 are both closures.
...And 18 more matches
Warning: expression closures are deprecated - JavaScript
the javascript warning "expression closures are deprecated" occurs when the non-standard expression closure syntax (shorthand function syntax) is used.
... message warning: expression closures are deprecated error type warning.
... examples deprecated syntax expression closures omit curly braces or return statements from function declarations or from method definitions in objects.
...And 2 more matches
Expression closures - Archive of obsolete content
expression closures are a shorthand function syntax for writing simple functions.
Functions
(nameexpressions are basic expressions like string and x that would eat up a huge amount of run time if the engine weren't smart enough to avoid symbol table lookups.) general closures are the base case.
...general closures force the interpreter to verify the whole scope chain.
...null closures.
...And 6 more matches
Avoiding leaks in JavaScript XPCOM components
however, it's easy to inadvertently create this same type of leak when using closures.
... to understand closures a little better before examining how they can cause leaks, consider the following example, in which there are two pairs of function objects, and each pair has an instance of the private_data variable: // this function returns an array containing two functions.
...ubles first private_data to 2 fns1[1]() + ", " + // doubles first private_data to 4 fns2[1]() + ", " + // doubles second private_data to 0 fns1[0]() + ", " + // increments first private_data to 5 fns2[0]() + ", " + // increments second private_data to 1 fns1[1]() + "."; // doubles first private_data to 10 } this shows that closures are quite powerful.
...And 2 more matches
Functions - JavaScript
the stack-like behavior can be seen in the following example: function foo(i) { if (i < 0) return; console.log('begin: ' + i); foo(i - 1); console.log('end: ' + i); } foo(3); // output: // begin: 3 // begin: 2 // begin: 1 // begin: 0 // end: 0 // end: 1 // end: 2 // end: 3 nested functions and closures you may nest a function within another function.
... both functions b and c form closures here.
... thus, the closures can contain multiple scopes; they recursively contain the scope of the functions containing it.
...And 2 more matches
Private Properties - Archive of obsolete content
this article discusses two common techniques: one using prefixes, the other closures.
... using closures another common technique, is to define private properties as variables and their getter and setter functions as a closure over these variables: function point(_x, _y) { this.getx = function () { return _x; }; this.setx = function (x) { _x = x; }; this.gety = function () { return _y; }; this.sety = function (y) { _y = y; }; } n...
...however, the use of closures makes private properties too restrictive: since there is no way to access variables in one closure from within another closure, there is no way for objects of the same class to access each other's private properties.
... using weakmaps the techniques above are either not restrictive enough (prefixes) or too restrictive (closures), however the recent introduction of weakmaps provides a solution.
A re-introduction to JavaScript (JS tutorial) - JavaScript
closures this leads us to one of the most powerful abstractions that javascript has to offer — but also the most potentially confusing.
...closures let you save state — as such, they can often be used in place of objects.
... you can find several excellent introductions to closures.
JavaScript Daemons Management - Archive of obsolete content
the architecture of the daemon constructor explicitly avoids the use of closures.
... advantages of this approch: abstraction passage of this object to javascript timers (both setinterval and settimeout) optimisation (avoiding closures) modularity the code the code of this framework is split into three files: daemon.js (the core) daemon-safe.js (an extension of the core which adds a replacement of setinterval with a recursive invocation of settimeout) daemon-methods.js (a wide and highly scalable collection of methods) the only independent module is daemon.js: both the daemon-safe.js module and the daemon-methods.js module require daemon.js to work.
Index - Archive of obsolete content
this article discusses two common techniques: one using prefixes, the other closures.
... 2010 expression closures function, javascript, language feature, non-standard, obsolete, operator, reference expression closures are a shorthand function syntax for writing simple functions.
How to build custom form controls - Learn web development
nitialized selectlist.foreach(function (select) { // as well as all its `option` elements var optionlist = select.queryselectorall('.option'); // each time a user hovers their mouse over an option, we highlight the given option optionlist.foreach(function (option) { option.addeventlistener('mouseover', function () { // note: the `select` and `option` variable are closures // available in the scope of our function call.
... // we toggle the visibility of the list of options toggleoptlist(select); }); // in case the control gains focus // the control gains the focus each time the user clicks on it or each time // they use the tabulation key to access the control select.addeventlistener('focus', function (event) { // note: the `select` and `selectlist` variable are closures // available in the scope of our function call.
Functions — reusable blocks of code - Learn web development
the lions, zebras, tigers, and penguins are kept in their own enclosures, and only have access to the things inside their enclosures — in the same manner as the function scopes.
... if they were able to get into other enclosures, problems would occur.
JSFunction
different closures (function objects) generated from the same source code may share the same jsfunction.
... as a result, some apis (such as js_callfunction) that operate on jsfunctions do not work properly with closures.
nsIFeedEntry
enclosures nsiarray an array of all the enclosures included in the entry.
... mediacontent nsiarray an array of all the enclosures or other media that might be displayed inline in the entry.
Deprecated and obsolete features - JavaScript
instead of the arguments property, you should use the arguments object inside function closures.
... functions expression closures are deprecated.
let - JavaScript
for example: var x = 'global'; let y = 'global'; console.log(this.x); // "global" console.log(this.y); // undefined emulating private members in dealing with constructors it is possible to use the let bindings to share one or more private members without using closures: var thing; { let privatescope = new weakmap(); let counter = 0; thing = function() { this.someproperty = 'foo'; privatescope.set(this, { hidden: ++counter, }); }; thing.prototype.showpublic = function() { return this.someproperty; }; thing.prototype.showprivate = function() { return privatescope.get(this).hidden; }; } console.log(typeof privatesco...
...pe); // "undefined" var thing = new thing(); console.log(thing); // thing {someproperty: "foo"} thing.showpublic(); // "foo" thing.showprivate(); // 1 the same privacy pattern with closures over local variables can be created with var, but those need a function scope (typically an iife in the module pattern) instead of just a block scope like in the example above.
Contributor's Guide - Archive of obsolete content
this article discusses two common techniques: one using prefixes, the other closures.
Guides - Archive of obsolete content
private properties learn how private properties can be implemented in javascript using prefixes, closures, and weakmaps, and how the sdk supports private properties by using namespaces (which are a generalization of weakmaps).
Appendix: What you should know about open-source software licenses - Archive of obsolete content
also, by requiring patent disclosures, it avoids the problem of submarine patents.
Appendix C: Avoiding using eval in Add-ons - Archive of obsolete content
closures will ensure the code is still valid, even if your outer function already returned from execution.
Appendix E: DOM Building and Insertion (HTML & XUL) - Archive of obsolete content
closures by far the best way to create dynamic event listeners is to use closures.
Use Case - Archive of obsolete content
use cases between rss aggregators and rss feeds polling rss feeds figuring out which version of rss 0.91 you have how to handle enclosures http mime type handling use cases between users and rss feeds subscribing to an rss feed ...
E4X for templating - Archive of obsolete content
while it may be obvious after a study of the basics of e4x that it can be used for this purpose, if one adds a few common purpose functions (especially along with the convenience of javascript 1.8 expression closures), the templates can function more dynamically, offering the power and readability of templating languages such as smarty for php (though admittedly without the currently wider cross-browser support of xslt or the strictly-xml approach of phptal or seethrough templating).
New in JavaScript 1.8 - Archive of obsolete content
new features in javascript 1.8 expression closures.
New in JavaScript - Archive of obsolete content
includes expression closures, generator expressions and array.reduce() javascript 1.8.1 version shipped in firefox 3.5.
Archived JavaScript Reference - Archive of obsolete content
see also the newer version of date.prototype.tolocaledatestring().ecmascript 2016 to es.next support in mozillaexpression closuresexpression closures are a shorthand function syntax for writing simple functions.for each...inthe for each...in statement iterates a specified variable over all values of object's properties.
asm.js - Game development
it does not allow objects, strings, closures, and basically anything that requires heap allocation.
Primitive - MDN Web Docs Glossary: Definitions of Web-related terms
for more information, see closures.
Bytecode Descriptions
the optimization that puts bindings in stack slots has to prove that the bindings won't need to be captured by closures or accessed using jsop::{get,bind,set,del}name instructions.
JS_GetFunctionFlags
jsfun_heavyweight the function uses language features such as closures, with, or eval that require extra work on the part of the interpreter.
JS_GetFunctionObject
however, for other functions, and particularly for javascript closures, many jsobjects may share the same jsfunction.
Parser API
note: expression closures are spidermonkey-specific.
SpiderMonkey 1.8
new javascript language features javascript 1.8 adds array.reduce() and reduceright(), expression closures, and generator expressions.
nsIFeed
enclosurecount long indicates the number of enclosures associated with a feed.
Using Objective-C from js-ctypes
probably used in more * complex block scenarios involving actual closure variables needing storage * (in `nodobjc`, javascript closures are leveraged instead).
Memory Management
closures you also need to be sure to retain references to any javascript code that native code may call back into.
Tutorial: Show Allocations Per Call Path - Firefox Developer Tools
we will probably change this to be the line number within page.html, not the line number within the handler code.) the onclick handler calls dodivsandspans, which calls divsandspans, which invokes closures of factory to do all the actual allocation.
WindowOrWorkerGlobalScope.setInterval() - Web APIs
the constructor architecture explicitly avoids the use of closures.
JavaScript Guide - JavaScript
ar and types basic syntax & comments declarations variable scope variable hoisting data structures and types literals control flow and error handling if...else switch try/catch/throw error objects loops and iteration for while do...while break/continue for..in for..of functions defining functions calling functions function scope closures arguments & parameters arrow functions expressions and operators assignment & comparisons arithmetic operators bitwise & logical operators conditional (ternary) operator numbers and dates number literals number object math object date object text formatting string literals string object template literals internationalization regular expressions ...
SyntaxError: missing } after function body - JavaScript
examples forgotten closing curly bracket oftentimes, there is a missing curly bracket in your function code: var charge = function() { if (sunny) { usesolarcells(); } else { promptbikeride(); }; correct would be: var charge = function() { if (sunny) { usesolarcells(); } else { promptbikeride(); } }; it can be more obscure when using iife, closures, or other constructs that use a lot of different parenthesis and curly brackets, for example.
JavaScript error reference - JavaScript
x"typeerror: variable "x" redeclares argumenturierror: malformed uri sequencewarning: 08/09 is not a legal ecma-262 octal constantwarning: -file- is being assigned a //# sourcemappingurl, but already has onewarning: date.prototype.tolocaleformat is deprecatedwarning: javascript 1.6's for-each-in loops are deprecatedwarning: string.x is deprecated; use string.prototype.x insteadwarning: expression closures are deprecatedwarning: unreachable code after return statement ...
AsyncFunction - JavaScript
note: async functions created with the asyncfunction constructor do not create closures to their creation contexts; they are always created in the global scope.
FinalizationRegistry - JavaScript
the javascript engine may hold references to things which look like they are unreachable (e.g., in closures, or inline caches).
Function.prototype.apply() - JavaScript
for alternative methods, please consider one of the following approaches: using object.__proto__: function.prototype.construct = function (aargs) { let onew = {}; onew.__proto__ = this.prototype; this.apply(onew, aargs); return onew; }; using closures: function.prototype.construct = function(aargs) { let fconstructor = this, fnewconstr = function() { fconstructor.apply(this, aargs); }; fnewconstr.prototype = fconstructor.prototype; return new fnewconstr(); }; using the function constructor: function.prototype.construct = function (aargs) { let fnewconstr = new function(""); fnewconstr.prototype = this.prototype; let onew =...
Function - JavaScript
examples difference between function constructor and function declaration functions created with the function constructor do not create closures to their creation contexts; they always are created in the global scope.
GeneratorFunction - JavaScript
note: generator function created with the generatorfunction constructor do not create closures to their creation contexts; they are always created in the global scope.
WeakRef - JavaScript
the javascript engine may hold references to things which look like they are unreachable (e.g., in closures, or inline caches).
eval() - JavaScript
} , false); closures are also helpful as a way to create parameterized functions without concatenating strings.
return - JavaScript
function counter() { for (var count = 1; ; count++) { // infinite loop console.log(count + 'a'); // until 5 if (count === 5) { return; } console.log(count + 'b'); // until 4 } console.log(count + 'c'); // never appears } counter(); // output: // 1a // 1b // 2a // 2b // 3a // 3b // 4a // 4b // 5a returning a function see also the article about closures.
var - JavaScript
the scope of a variable declared with var is its current execution context and closures thereof, which is either the enclosing function and functions declared within it, or, for variables declared outside any function, global.
JavaScript
closures a closure is the combination of a function and the lexical environment within which that function was declared.