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arguments.callee allows anonymous functions to call themselves recursively. in .NET Get PDF-417 2d barcode in .NET arguments.callee allows anonymous functions to call themselves recursively.

arguments.callee allows anonymous functions to call themselves recursively. use .net pdf-417 2d barcode generation tobuild pdf417 2d barcode for .net upc barcode Here"s an example:. function(count){ if (count & lt; 5) { alert(count); arguments.callee(++count); } } )(1). Here you have an anonymous f .net framework PDF417 unction that receives a count parameter, alerts it, and then calls itself with an incremented count. The whole function is wrapped in parentheses and followed by another set of parentheses, which invokes the function right away, passing the initial value 1.

The result of this code is four alerts showing the numbers 1, 2, 3, and 4.. Boolean Our journey through the buil PDF 417 for .NET t-in objects in JavaScript continues, and the next ones are fairly easy; they merely wrap the primitive data types boolean, number, and string. You already know a lot about booleans from 2.

Now, let"s meet the Boolean() constructor:. >>> var b = new Boolean();. It is important to note that barcode pdf417 for .NET this creates a new object b, and not a primitive boolean value. To get the primitive value, you can call the valueOf() method (inherited from Object).

. >>> var b = new Boolean(); >>> typeof b "object". >>> typeof b.valueOf(). "boolean". [ 119 ]. Objects >>> b.valueOf(). false Overall, objects creat ed with the Boolean() constructor are not too useful, as they don"t provide any methods or properties, other than the inherited ones. The Boolean() function is useful when called as a normal function, without new. This converts non-booleans to booleans (which is the same as using a double negation !!value).

. >>> Boolean("test"). true >>> Boolean(""). false >>> Boolean({}). true Apart from the six fals y values, everything else is truthy in JavaScript, including the empty objects. This also means that all boolean objects created with new Boolean() evaluate to true, as they are objects. Let"s create two boolean objects, one truthy and one falsy:.

>>> var b1 = new Bo visual .net PDF 417 olean(true) >>> b1.valueOf().

true >>> var b2 = new Bo barcode pdf417 for .NET olean(false) >>> b2.valueOf().

false Now let"s convert them to primitive boolean values. They both convert to true because all objects are truthy..

>>> Boolean(b1). true >>> Boolean(b2). true [ 120 ]. 4 . Number Similarly to Boolean(), the Number() function can be used: As a normal function in order to try to convert any value to a number. This is similar to the use of parseInt() or parseFloat(). As a constructor function (with new) to create objects.

>>> var n = Number("12.12"); >>> n >>> typeof n "number". >>> var n = new Number("12.12"); >>> typeof n "object" Because functions a Visual Studio .NET PDF-417 2d barcode re objects, they can have properties. The Number() function contains some interesting built-in properties (which you cannot modify):.

>>> Number.MAX_VALUE 1.7976931348623157e+308 >>> Number.MIN_VALUE 5e-324. >>> Number.POSITIVE_INFINITY Infinity >>> Number.NEGATIVE_INFINITY -Infinity >>> Number.NaN NaN The number objects provi PDF417 for .NET de three methods toFixed(), toPrecision() and toExponential() (see Appendix C for details)..

>>> var n = new Num ber(123.456) >>> n.toFixed(1).

"123.5". [ 121 ]. Objects Note that you can use these methods without explicitly creating a number object. In such cases, the number object will be created (and destroyed) for you behind the scenes:. >>> (12345).toExponential(). "1.2345e+4" As with all obje cts, number objects also provide the toString() method. It is interesting to note that this method accept an optional radix parameter (10 is the default).

. >>> var n = new Num Visual Studio .NET PDF-417 2d barcode ber(255); >>> n.toString();.

"255". >>> n.toString(10);. "255". >>> n.toString(16);. "ff". >>> (3).toString(2);. "11". >>> (3).toString(10);. String Using the String() construct PDF417 for .NET or function you can create string objects. Objects produced this way provide some useful methods when it comes to text manipulation, but if you don"t plan on using these methods, you"re probably better off just using primitive strings.

Here"s an example that shows the difference between a string object and a primitive string data type.. >>> var primitive = "Hello"; >>> typeof primitive;. "string". [ 122 ]. 4 >>> var obj = ne .NET PDF-417 2d barcode w String("world"); >>> typeof obj;. "object" A string object is very similar to an array of characters. The string objects have an indexed property for each character and they also have a length property..

>>> obj[0]. >>> obj[4].
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