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fspore

Values, Types, and Operators :: Eloquent JavaScript - 0 views

eloquentjavascript.net/01_values.html

javascript programming

shared by fspore on 27 Jun 15 - No Cached
  • Not all operators are symbols. Some are written as words. One example is the typeof operator, which produces a string value naming the type of the value you give it.
  • Having such numbers is useful for storing strings inside a computer because it makes it possible to represent them as a sequence of numbers. When comparing strings, JavaScript goes over them from left to right, comparing the numeric codes of the characters one by one.
  • There is only one value in JavaScript that is not equal to itself, and that is NaN, which stands for “not a number”.
  • ...16 more annotations...
  • In practice, you can usually get by with knowing that of the operators we have seen so far, || has the lowest precedence, then comes &&, then the comparison operators (>, ==, and so on), and then the rest. This order has been chosen such that, in typical expressions like the following one, as few parentheses as possible are necessary:
  • The difference in meaning between undefined and null is an accident of JavaScript’s design, and it doesn’t matter most of the time. In the cases where you actually have to concern yourself with these values, I recommend treating them as interchangeable (more on that in a moment).
  • . Yet in the third expression, + tries string concatenation before numeric addition
  • When something that doesn’t map to a number in an obvious way (such as "five" or undefined) is converted to a number, the value NaN is produced.
  • Further arithmetic operations on NaN keep producing NaN, so if you find yourself getting one of those in an unexpected place, look for accidental type conversions.
  • g ==, the outcome is easy to predict: you should get true when both values are the same, except in the case of NaN.
  • But when the types differ, JavaScript uses a complicated and confusing set of rules to determine what to do. In most cases, it just tries to convert one of the values to the other value’s type. However, when null or undefined occurs on either side of the operator, it produces true only if both sides are one of null or undefined.
  • That last piece of behavior is often useful. When you want to test whether a value has a real value instead of null or undefined, you can simply compare it to null with the == (or !=) operator.
  • The rules for converting strings and numbers to Boolean values state that 0, NaN, and the empty string ("") count as false, while all the other values count as true.
  • where you do not want any automatic type conversions to happen, there are two extra operators: === and !==. The first tests whether a value is precisely equal to the other, and the second tests whether it is not precisely equal. So "" === false is false as expected.
  • The logical operators && and || handle values of different types in a peculiar way. They will convert the value on their left side to Boolean type in order to decide what to do, but depending on the operator and the result of that conversion, they return either the original left-hand value or the right-hand value.
  • The || operator, for example, will return the value to its left when that can be converted to true and will return the value on its right otherwise. This conversion works as you’d expect for Boolean values and should do something analogous for values of other types.
  • This functionality allows the || operator to be used as a way to fall back on a default value. If you give it an expression that might produce an empty value on the left, the value on the right will be used as a replacement in that case.
  • The && operator works similarly, but the other way around. When the value to its left is something that converts to false, it returns that value, and otherwise it returns the value on its right.
  • Another important property of these two operators is that the expression to their right is evaluated only when necessary. In the case of true || X, no matter what X is—even if it’s an expression that does something terrible—the result will be true, and X is never evaluated. The same goes for false && X, which is false and will ignore X. This is called short-circuit evaluation.
  • - to negate a number
David Rietz

Beyond SoundEx - Functions for Fuzzy Searching in MS SQL Server - 0 views

www.anastasiosyal.com/...18.aspx

sql programming development fuzzy search soundex difference functions

shared by David Rietz on 19 Aug 10 - Cached
  • David Rietz on 19 Aug 10
     
    Quite often we come across a requirement where we may need to perform some sort of fuzzy string grouping or data correlation. For example, we may want to correlate the customer records of a database by identifying records that are similar but not necessarily exactly the same (due to spelling mistakes for example). Obviously a simple group by, will not successfully group such data. We will need to employ what is commonly referred to as a distance algorithm or a string metric in order to determine how close 2 string values are.
anonymous

Write to Excel in Java Using JExcel API - QuicklyJava - 0 views

www.quicklyjava.com/write-to-excel-in-java

java jxl cellformate

shared by anonymous on 24 Mar 15 - No Cached
  •   //Create <span id="IL_AD12" class="IL_AD">Cells</span> with contents of different data types.             //Also specify the <span id="IL_AD11" class="IL_AD">Cell</span> coordinates in the constructor            Label label = new Label(0, 0, "Label (String)");            DateTime date = new DateTime(1, 0, new Date());            Boolean <span id="IL_AD8" class="IL_AD">bool</span> = new Boolean(2, 0, true);            Number num = new Number(3, 0, 9.99); 
  • anonymous on 24 Mar 15
     
    Praktisches Beispiel, verschiedene Datentypen in Excel zu schreiben.
Joel Bennett

Making Strings More Secure - 0 views

blogs.msdn.com/...143254.aspx

.netframework develop security

shared by Joel Bennett on 08 Feb 07 - Cached
  • Whidbey will be introducing a new class, SecureString, that helps to make this all easier for you. SecureStrings are held in encrypted memory by the CLR (using DPAPI), and are only unencrypted when they are accessed.  This limits the amount of time that your string is in plaintext for an attacker to see.  Since SecureString uses DPAPI to help secure your data, it's not available on Windows 98, ME, or Windows 2000 with anything less than service pack 3.
  • Joel Bennett on 08 Feb 07
     
    The SecureString class provides a string type that is stored encrypted in memory when not in use and will not be copied around by the Garbage Collector, plus they can be zeroed out on destruction, and locked to read-only mode... Which makes this perfect for storing things like passwords in memory.
  • anonymous on 27 Sep 13
     
    Geniuzz.com es una pequeña sitios de trabajo. Este sitio está dedicado a todos los españoles están buscando trabajadores con un precio muy bajo. Si usted contrata a un trabajador de aquí. Te garantizo que es muy satisfactorio. Si eres un webmaster o BPA jugadores que necesitan ayuda. Acaba de llegar al mercado muy amable. Y yo también le ayudará. Por favor visite mi puesto aquí https://www.facebook.com/pages/Geniuzzcom/525081180900419
alex gross

Univar - Session, cookie, query string & cache variables unified - 5 views

univar.codeplex.com

asp.net development codeplex

shared by alex gross on 26 Nov 09 - Cached
  • alex gross on 26 Nov 09
     
    s a web developer I have often had to work with the session, cookie, query string and cache to persist data locally. But it is a shame that there is no neat way of doing so. So I decided to write my own code to provide a simpler and unified model to work with and finally came up with this, a type safe and generic wrapper that supports complex data types
Joel Bennett

Windows PowerShell : Base64 Encode/Decode a string - as a type extension - 0 views

blogs.msdn.com/...583265.aspx

@public development powershell ps1xml scripting typeextensions

shared by Joel Bennett on 04 Jun 07 - Cached
  • Joel Bennett on 04 Jun 07
     
    Another great example of a custom type extension - adding a ToBase64 onto Strings
anonymous

Functional Javascript - 0 views

osteele.com/...functional

javascript functional programming library

shared by anonymous on 10 Feb 09 - Cached
Emma Deloney liked it
  • anonymous on 10 Feb 09
     
    Functional is a library for functional programming in JavaScript. It defines the standard higher-order functions such as map, reduce (aka foldl), and select (aka filter). It also defines functions such as curry, rcurry, and partial for partial function application; and compose, guard, and until for function-level programming. And all these functions accept strings, such as 'x -> x+1', 'x+1', or '+1' as synonyms for the more verbose function(x) {return x+1}.
Rick Fan

Updating extensions for Firefox 3.1 - MDC - 0 views

developer.mozilla.org/...ing_extensions_for_Firefox_3.1

develop firefox 3.1

shared by Rick Fan on 17 Jan 09 - No Cached
  • The textbox type timed is deprecated; instead, you should use search.
  • The JSON.jsm JavaScript module was dropped in Firefox 3.1 in favor of native JSON object support
  • if (typeof(JSON) == "undefined") {    Components.utils.import("resource://gre/modules/JSON.jsm");    JSON.parse = JSON.fromString;    JSON.stringify = JSON.toString;  }  
findbestopensource

How to create SEO friendly url. - 0 views

www.findbestopensource.com/...seo-friendly-url

seo url programmers web-developers

shared by findbestopensource on 19 Feb 11 - No Cached
  • findbestopensource on 19 Feb 11
     
    SEO friendly URL is recommended for any website which wants to be indexed and wants its presence in search results. Searchengine mostly index the static URL. It will avoid the URL which has lot of query strings. Almost all websites generate content dynamically then how could the URL be static. That is the job of the programmer. This article explains in view of Java Struts2 framework.
alex gross

Embracing the Cloud - CodeRun - Integrated Development Environment in the Cloud - 1 views

www.embracingthecloud.com/...mentEnvironmentInTheCloud.aspx

diigo

shared by alex gross on 12 Nov 09 - Cached
  • alex gross on 12 Nov 09
     
    public String CloudThoughts{ get; set;}
Joel Bennett

Powershell script blocks as .NET event handlers - 0 views

arildf.spaces.live.com/...cns!E99F8B43533149B0!127.entry

.net @public delegates development event oop powershell

shared by Joel Bennett on 21 May 07 - Cached
  • Joel Bennett on 21 May 07
     
    How to handle Events in PowerShell (another example of things you just can't do in a string based shell?) a GREAT example of how using PowerShell leads to .Net programming (and how knowing .NET programming translates into knowing PowerShell).
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