ReferenceError: assignment to undeclared variable "x" - JavaScript
the javascript strict mode-only exception "assignment to undeclated variable" occurs when the value has been assigned to an undeclared variable.
... message referenceerror: assignment to undeclared variable "x" (firefox) referenceerror: "x" is not defined (chrome) referenceerror: variable undefined in strict mode (edge) error type referenceerror warning in strict mode only.
... a value has been assigned to an undeclared variable.
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TypeError: variable "x" redeclares argument - JavaScript
the javascript strict mode-only exception "variable redeclares argument" occurs when the same variable name occurs as a function parameter and is then redeclared using a var assignment in a function body again.
... message typeerror: variable "x" redeclares argument (firefox) error type typeerror warning in strict mode only.
... the same variable name occurs as a function parameter and is then redeclared using a var assignment in a function body again.
... examples invalid cases in this case, the variable "arg" redeclares the argument.

WebIDL bindings
note that this allows callees to declare their methods as taking an nsastring& or nsstring& if desired.
...this can mean xpcom interfaces (whether declared in xpidl or not) or it can mean some type that there's a castable native unwrapping function for.
... on-stack typed arrays can be declared as rootedtypedarray<typedarraytype> (e.g.
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Grammar and types - JavaScript
var declares a variable, optionally initializing it to a value.
... let declares a block-scoped, local variable, optionally initializing it to a value.
... const declares a block-scoped, read-only named constant.
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Add to iPhoto
declaring the apis the first thing we have to do is declare the mac os x apis we'll be using.
... for the sake of organization, i chose to implement each system framework (and, mind you, i only declare the apis i actually use, not all of them) as a javascript object containing all the types and methods that framework's api.
...these are declared near the top of the code: const osstatus = ctypes.int32_t; const cfindex = ctypes.long; const optionbits = ctypes.uint32_t; osstatus used to represent the status code resulting from an operation.
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Following the Android Toasts Tutorial from a JNI Perspective
declare the types we will start by declaring the types needed.
...when something is declared, we are stating the sig and the name.
... so let us now declare the types for our toast example.
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Introduction to XPCOM for the DOM
furthermore, a class can be de declared to be "abstract" if it declares some methods but does not implement them entirely.
... pushing this concept to its maximum, a class can be "purely virtual" if it declares methods without implementing any of them.
...pure virtual methods are declared with the following syntax: virtual nsresult functionfoo() = 0; an interface is thus simply a c++ class where all the member functions are declared as pure virtual functions.
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Declaring types
the ctypes object offers a number of constructor methods that let you declare types.
...each type you declare using js-ctypes corresponds to a compatible c declaration.
... types are declared in terms of other, already defined types.
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IPDL Tutorial
all messages for multi-process plugins and tabs in firefox are declared in the ipdl language.
...an ipdl protocol declares how actors communicate: it declares the possible messages that may be sent between actors, as well as a state machine describing when messages are allowed to be sent.
... the parent actor is typically the more permanent side of the conversation: parent/child actors parent child ipc tabs chrome process content process ipc plugins content process plugin process each protocol is declared in a separate file.
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Using js-ctypes
on windows, for example, you might load the system user32 library like this: var lib = ctypes.open("user32.dll"); on mac os x, you can load the core foundation library from the core foundation framework like this: var corefoundation = ctypes.open("/system/library/frameworks/corefoundation.framework/corefoundation"); the returned object is a library object that you use to declare functions and data types for use with the loaded library.
... using the library you may need to declare new types.
...you will almost certainly need to declare one or more functions, so that you can call them.
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XPIDL
types can of course be one of the fundamental types, or any other type declared via a typedef, interface, or a native type.
...to declare a webidl interface in xpidl, write webidl interfacename;.
... methods and attributes interfaces declare a series of attributes and methods.
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Standard OS Libraries
); /* note: if you go to getcursorpos page on msdn, it says first argument is of structure point, so lets create that structure, * the link here shows that that x and y are type long which is ctypes.long */ // https://msdn.microsoft.com/en-us/library/windows/desktop/dd162805%28v=vs.85%29.aspx var point = new ctypes.structtype("tagpoint", [ { "x": ctypes.long }, { "y": ctypes.long } ]); /* declare the signature of the function we are going to call */ var getcursorpos = lib.declare('getcursorpos', ctypes.winapi_abi, ctypes.bool, point.ptr ); /* use it like this */ var point = point(); var ret = getcursorpos(point.address()); components.utils.reporterror(ret); components.utils.reporterror(point); lib.close(); resources for winapi githubgists :: noitidart / search · winap...
...esource://gre/modules/ctypes.jsm'); var gdk = ctypes.open('libgdk-x11-2.0.so.0'); // types var gint = ctypes.int; var gdkdevice = ctypes.structtype('gdkdevice'); var gdkmodifiertype = ctypes.int; var gdkwindow = ctypes.structtype('gdkwindow'); var void = ctypes.void_t; // https://developer.gnome.org/gdk3/stable/gdk3-windows.html#gdk-get-default-root-window var gdk_get_default_root_window = gdk.declare('gdk_get_default_root_window', ctypes.default_abi, gdkwindow.ptr // return - the root window, which is top most parent of all windows ); // in gdk2 we have to use gdk_window_get_pointer, but in gdk3 it was deprecated and have to use gdk_window_get_device_position https://developer.gnome.org/gdk3/stable/gdk3-windows.html#gdk-window-get-pointer var gdk_window_get_pointer = gdk.declare('gdk_...
... types var gint = ctypes.int; var gdkdevice = ctypes.structtype('gdkdevice'); var gdkdevicemanager = ctypes.structtype('gdkdevicemanager'); var gdkdisplay = ctypes.structtype('gdkdisplay'); var gdkmodifiertype = ctypes.int; var gdkwindow = ctypes.structtype('gdkwindow'); // https://developer.gnome.org/gdk3/stable/gdk3-windows.html#gdk-get-default-root-window var gdk_get_default_root_window = gdk.declare('gdk_get_default_root_window', ctypes.default_abi, gdkwindow.ptr // return - the root window, which is top most parent of all windows ); // in gdk2 we have to use gdk_window_get_pointer, but in gdk3 it was deprecated and have to use gdk_window_get_device_position // https://developer.gnome.org/gdk3/stable/gdk3-windows.html#gdk-window-get-device-position var gdk_window_get_device_position ...
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Understanding WebAssembly text format - WebAssembly
all code in a webassembly module is grouped into functions, which have the following pseudo-code structure: ( func <signature> <locals> <body> ) the signature declares what the function takes (parameters) and returns (return values).
... the locals are like vars in javascript, but with explicit types declared.
... each parameter has a type explicitly declared; wasm currently has four available number types (plus reference types; see the reference types) section below): i32: 32-bit integer i64: 64-bit integer f32: 32-bit float f64: 64-bit float a single parameter is written (param i32) and the return type is written (result i32), hence a binary function that takes two 32-bit integers and returns a 64-bit float would be written like this: (fun...
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Using Objective-C from js-ctypes
get a reference to a class class definitions are retrieved with the objc_getclass function, declared in /usr/include/objc/runtime.h.
...*name); in /usr/include/objc/objc.h, class is defined as an opaque type by the following: typedef struct objc_class *class; in this example, we need the classnsspeechsynthesizer, which is retrieved with the following code: class nsspeechsynthesizer = objc_getclass("nsspeechsynthesizer"); registering a selector selectors can be registered and retrieved with sel_registername function, also declared in /usr/include/objc/runtime.h.
...this message can be sent using the objc_msgsend function, and its variants, which are declared in /usr/include/objc/message.h.
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var - JavaScript
the var statement declares a function-scoped or globally-scoped variable, optionally initializing it to a value.
... 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.
... 'use strict'; function foo() { var x = 1; function bar() { var y = 2; console.log(x); // 1 (function `bar` closes over `x`) console.log(y); // 2 (`y` is in scope) } bar(); console.log(x); // 1 (`x` is in scope) console.log(y); // referenceerror in strict mode, `y` is scoped to `bar` } foo(); variables declared using var are created before any code is executed in a process known as hoisting.
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