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A arguments[] (Collection) Property attributes: ReadOnly, DontEnum. Cross-references: Wrox Instant JavaScript, ISBN 1-861001-27-4 page 27 myResult = myFunction(aaa, bbb, ccc, ddd); Arguments array length aaa bbb ccc ddd arguments[] (Collection) A property that is available inside a function to access its Arguments object. ECMAScript edition 2 JavaScript 1.1 JScript 5.5 Internet Explorer 5.5 Netscape 3.0 Availability: This property is only defined within a function body in a web browser. However, some implementations may provide external arguments via this property. See also: Arguments object, Function arguments, Function.arguments[] Property attributes: ReadOnly. argv parameter (Definition) A command-line argument collection. Since JavaScript can be used in many environments, it is possible that in a server-side application you will have access to the command-line arguments. If that is the case, then it is likely that you will have an argv property, which contains the argument values.
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JavaScript Programmer’s Reference Property attributes: DontEnum. Arguments.length (Property) The number of arguments passed to a function dictates the length of the array to hold them. Availability: JavaScript 1.1 JScript 5.5 Internet Explorer 5.5 Netscape 3.0 Property/method value type: Number primitive JavaScript syntax: -myArguments.length The number of arguments passed to a function when it is called. The length property of the Arguments object can be inspected or used in an enumeration loop to access each argument in turn. Even if no placeholder arguments are specified, you can still call a function and pass as many arguments to it as you like. They will be assembled into an array that you can manipulate in the way you would normally operate on any other array. You can build enumerators to process all the elements and do something with them. You can compare this value with the arity property of the owner function object. This will allow you to determine whether the correct number of arguments was passed. Example code: Argument, Argument list, Arguments object, Collection.length, Function.arguments[], Function.arity, Function.length See also:
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A Arguments.caller (Property) Warnings: . This property is incorrectly implemented in Netscape 3, which returned a reference to the calling function and not its arguments. Since it works correctly in Netscape 4, you should consider that it is only available there. . The example shown below did not work correctly on Netscape 6.0 at time of writing. . This is not part of the ECMA standard and is at some risk of becoming deprecated and removed in later versions. In fact, it is deprecated as of JavaScript version 1.3 and should not be used in new projects. . It is recommended that you do not build this into functional deployed applications, although the risks involved with using it for debugging are small. Example code: See also: Arguments object, Arguments.callee, Debugging client side, Function object, Function.caller, Hierarchy of objects
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JavaScript Programmer’s Reference Arguments.caller (Property) The object that called the function that owns the arguments. Availability: JavaScript 1.1 JScript 5.5 Internet Explorer 5.5 Netscape 3.0 Deprecated Property/method value type: Arguments.object JavaScript syntax: -myArguments.caller This property refers to an Arguments object belonging to a parent function. Function call tracing can traverse a hierarchy based on Arguments objects to unwind a call stack. This might be useful when debugging complex script projects. You can work out the calling tree by tracing the callee and caller relationships back up the execution context tree. The caller is a reference to the arguments object of the caller of the function. To reference the function that called the current one, use this: arguments.caller.callee To get the name of the function that called the current one use this (so long as the interpreter supports the name property on functions): arguments.caller.callee.name With this, you could build a stack trace function that you can call and will unwind the calling context stack to show you how you got to the location you are in. Tools such as this are useful to have around and if they are in a separate .js file, you can include them when you need to debug a script problem. When the caller value is Null, it refers to the global code context because there is no arguments array in that context at least not in a web browser. Other host implementations may provide an additional level of arguments according to how the script is executed. This has no meaning outside of the context of a function. The example shows how to walk up the calling tree and should yield the following output when it is run: level2 called by level1 called by global level
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A Arguments.callee (Property) Property JavaScript JScript N IE Opera NES ECMA Notes callee 1.2 + 5.5 + 4.0 + 5.5 + - DontEnum caller 1.1 + 5.5 + 3.0 + 5.5 + Warning, DontEnum, Deprecated length 1.1 + 5.5 + 3.0 + 5.5 + - ReadOnly, DontEnum Cross-references: ECMA 262 edition 2 section 10.1.6 ECMA 262 edition 2 section 10.1.8 ECMA 262 edition 2 section 15.2.3.1 ECMA 262 edition 3 section 10.1.6 ECMA 262 edition 3 section 10.1.8 Wrox Instant JavaScript, ISBN 1-861001-27-4 page 27 Arguments.callee (Property) The functionobject being called. Availability: JavaScript 1.2 JScript 5.5 Internet Explorer 5.5 Netscape 4.0 Property/method value type: Function object JavaScript syntax: -myArguments.callee The value yielded by this property is the function object that owns the arguments. You can work out the calling tree by tracing the callee and caller relationships back up the tree. The callee is a reference to the parent function that owns the arguments object. This has no meaning outside of the context of a function. See also: Arguments object, Arguments.caller, Debugging client side, Function object Property attributes: DontEnum.
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JavaScript Programmer’s Reference Warnings: . In Netscape, the arguments array is implemented as an object of type Arguments but in MSIE its type is simply an Object object. In Netscape, the arguments object is extended with a toString() mechanism that returns the arguments as a comma separated list in a String. In MSIE, you get the object type. . None of the properties of the arguments object are enumerable. . Because the arguments object is meant to be used in a manner that is local to the function it was created in, you get unpredictable results if you pass it to another function as an argument itself. . Note that at the time of writing the example given below did not seem to work on Netscape 6.0. Example code: See also: Argument, Argument list, Arguments.callee, Arguments.caller, Arguments.length, arguments[], Collectionobject, Execution context, Function arguments, Function call, Function call operator ( ), function( … ) …, Function.arguments[], Object inspector, Object.prototype, Parameter
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A Arguments object (Object/core) Cross-references: ECMA 262 edition 2 section 11.2.4 ECMA 262 edition 3 section 11.2.4 Arguments object (Object/core) An object represented as an array containing the argument values passed to the function when it is called. Availability: ECMAScript edition 2 JavaScript 1.1 JScript 5.5 Internet Explorer 5.5 Netscape 3.0 JavaScript syntax: -myArguments = arguments Object properties: callee, caller, length When you call a function, you can pass zero or more arguments to it from outside. These arguments are available as named variables whose names are defined in the function declaration. However, they are also available as the elements in an array. The arguments array is referenced by the arguments property of the callobject. Since the call object is added to the scope chain, you don’t need to reference the argumentsproperty with an object identifier prefix. The array-based mechanism is useful for those times when you want to implement a function that has a variable number of arguments passed to it according to how and when it is called. A new arguments object is created for each execution context. When the flow of control enters an execution context for a function block, a new arguments object is created. Declared functions, anonymous code, and implementation-specific code all use this technique. When creating the argumentsobject, the initial conditions are set up like this: . The internal Prototype property for the argumentsobject is that returned by calling Object.Prototype. . A property is created with the name callee. The callee property cannot be enumerated. The initial value of the callee property is the function object being executed. Anonymous functions can then be executed recursively if you so desire. . A property named length is created whose value is the number of arguments passed to the function. The length property cannot be enumerated. . Each argument is associated with a property whose name is its integer position in an array of arguments. The arguments are accessed in presentation order. Although the names are strings, they represent purely numeric values and range from 0 to 1 less than the value in the length property. You can enumerate the arguments in a forloop. Note that objects of this type can only exist within a function body in a web browser, because you cannot pass parameters to a script from outside. It is possible that an embedded JavaScript interpreter may provide a hostobject to the main entry point to perform the same function.
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JavaScript Programmer’s Reference In general, the first argument is the name of the script or program being executed. The argc value should never be zero and as a minimum should indicate that there is at least one argument. The actual values of the arguments are collected in an array called argv. You should be able to access argv and argc in a similar manner. See also: argv parameter, Execution context, Execution environment, Host environment, main() function Argument (Definition) A value passed to a function. Arguments are passed to functions when they are called. They are substituted for the formal parameters in the function declaration. Because JavaScript is weakly typed, you will need to implement any type checking you need for yourself. You can compare the arity property of the owning function with the length property of the argumentsarray. If they are unequal, then the function was called with the wrong number of arguments. You can then check the type of the arguments one by one to compare them against the expected types. This is a lot of work for little gain unless it is an important aspect of your design. See also: Arguments object, Arguments.length, Conversion, Definition, Function, function( ) …, Function.arguments[], Parameter Argument list (Definition) A list of values that are passed to a function. Availability: ECMAScript edition 2 Argument lists are used to pass information into functions. An argument list can have any of the following structures: . Empty no arguments . A single argument . A series of arguments separated by commas Each argument, if present, can be an expression that will be evaluated and whose resulting value will be used as the argument when it is passed to the function. See also: Arguments object, Arguments.length, Function.arguments[], Left-Hand-Side expression, Parameter
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A Area.y (Property) The horizontal position of the object in the display measured in pixels. You can use the x and y coordinates of the object as targets of the scrollTo()method for the window it lives in. See also: Location.x Area.y (Property) Netscape provides this as an enumerable property because it represents an as a Url object. JavaScript 1.2 Number primitive myArea.y N Availability: Netscape 4.0 Property/method value type: JavaScript syntax: The vertical position of the object in the display measured in pixels. You can use the x and y coordinates of the object as targets of the scrollTo()method for the window it lives in. See also: Location.y areas[] (Collection) A collection of all the Area objects that contribute to making an image map for the page. JScript 3.0 IE myMap.areas Availability: Internet Explorer 4.0 JavaScript syntax: See also: Map.areas[] Property attributes: ReadOnly. argc parameter (Definition) A command-line argument count. Since JavaScript can be used in many environments, it is possible that in a server-side application you will have access to the command-line arguments. If that is the case, then it is likely that you will have an argc property, which indicates how many arguments have been passed.
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JavaScript Programmer’s Reference Area.target (Property) MSIE represents URLs in Link objects. Availability: DOM level 1 JavaScript 1.1 JScript 1.0 Internet Explorer 3.02 Netscape 3.0 Opera 3.0 Property/method value type: String primitive JavaScript syntax: -myArea.target HTML syntax: