Browse by Tags

• ASP
• C#
• Floating Point Arithmetic
• JScript
• Performance
• Scripting
• Type Inference
• VBScript

• C# 3.0 is still statically typed, honest!

  Since LINQ was announced I've seen a lot of really positive feedback and a lot of questions and concerns. Keep 'em coming! We need this feedback so that we can both correct misconceptions early and get the design right now. One of the misconceptions that Read More... Posted Tuesday, September 27, 2005 10:03 AM by Eric Lippert | 23 Comments Filed under: JScript .NET, JScript, C#, Type Inference

• Instance-bound nested classes in JScript .NET

  The other day someone asked me about a slightly odd but very useful feature in JScript.NET, and I figure if one person asks me about it, maybe more people want to know as well. In JScript.NET you can say class alpha { var foo; class bravo { function blah() Read More... Posted Monday, May 02, 2005 12:30 PM by Eric Lippert | 2 Comments Filed under: JScript .NET

• Fun With Floating Point Arithmetic, Part Six

  One more thing -- I said earlier that the VBScript float-to-string algorithm was a little bit different than the JScript algorithm. We can demonstrate quite easily by comparing the outputs of two nigh-identical programs: ' VBScript print 9.2 * 100.0 < Read More... Posted Wednesday, January 26, 2005 1:02 PM by Eric Lippert | 4 Comments Filed under: JScript .NET, VBScript, Scripting, Floating Point Arithmetic

• Fun with Floating Point Arithmetic, Part Five

  I went to Joel Spolsky's geek dinner at Crossroads the other night, which was a lot of fun. I didn't get much of a chance to chat with Joel, as he was surrounded by a cadre of adoring fans three deep the whole time. I mostly hung out with KC and Larry Read More... Posted Thursday, January 20, 2005 10:56 AM by Eric Lippert | 10 Comments Filed under: JScript .NET, VBScript, Scripting, Floating Point Arithmetic

• JScript .NET Type Coercion Semantics, Part Four: Coercion at last

  Before I get going, a couple notable milestones. First, this is post number 200 ! Who would have believed that I'd have so much to ramble on about? ("Anyone who knows you" would be the correct answer to that rhetorical question I suppose.) Second, as Read More... Posted Tuesday, August 10, 2004 10:56 AM by Eric Lippert | 9 Comments Filed under: JScript .NET, JScript, Scripting

• JScript .NET Type Coercion Semantics, Part Three: Assignability

  Before I begin today's technical topic, a quick link to what promises to be a terrifying , I mean, terribly interesting blog. Mario , the guy who tests the code that I write and thereby keeps me honest, the guy who's application for a backyard barbecue Read More... Posted Friday, August 06, 2004 10:38 AM by Eric Lippert | 4 Comments Filed under: JScript .NET, JScript, Scripting

• JScript .NET Type Coercion Semantics, Part Two: Promotability

  Last time I gave some vague, high-level definitions of the type system concepts promotable , assignable and coercible . Today I'll give a more precise definition of promotable . The others I'll define more precisely later. Suppose we have an assignment Read More... Posted Wednesday, August 04, 2004 5:49 PM by Eric Lippert | 2 Comments Filed under: JScript .NET, JScript, Scripting

• JScript .NET Type Coercion Semantics

  Stan Lippman has started an interesting series of blog entries on how Managed C++ determines which function foo to call when you call foo(bar) given that there may be several visible functions of that name in the current scope. That's quite coincidental, Read More... Posted Monday, August 02, 2004 3:19 PM by Eric Lippert | 0 Comments Filed under: JScript .NET, JScript, Scripting

• A JScript .NET Design Donnybrook, Part Two

  I am totally amused that the comments on yesterday's entry are nigh-isomorphic to the argument that we had over this in October 2000. As noted, f.bar(f); does in fact call the base class function, not the derived class function as some might expect. I Read More... Posted Tuesday, June 08, 2004 2:01 PM by Eric Lippert | 10 Comments Filed under: JScript .NET, JScript, Scripting, Performance

• A JScript .NET Design Donnybrook

  When you're designing a new programming language, the "main line" cases are easy. It's the "corner" cases that bedevil language designers -- the little fiddly bits where two language features that make perfect sense on their own interact in some weird Read More... Posted Monday, June 07, 2004 2:15 PM by Eric Lippert | 22 Comments Filed under: JScript .NET, JScript, Scripting, Performance

• JScript .NET Classes Are Serializable -- Surprise!

  You learn something new every day in this job. Or, more accurately, some days you learn things again that you'd forgotten years ago. Someone just asked me why it is that all JScript .NET classes are serializable. I admit it, my first reaction was "They Read More... Posted Wednesday, May 26, 2004 5:29 PM by Eric Lippert | 8 Comments Filed under: JScript .NET, JScript, Scripting

• Eval is Evil, Part Three

  Recall that in Part One we discussed eval on the client, and in Part Two we discussed eval on the server. Today, I answer a question about eval in JScript .NET. S omeone sent me mail the other day asking why this C# program snippet didn't work: x = Microsoft.JScript.GlobalObject.eval("1"); Read More... Posted Monday, January 26, 2004 11:13 AM by Eric Lippert | 1 Comments Filed under: JScript .NET, JScript, Scripting

• Virtual Methods and Brittle Base Classes

  Hey, I'm back! And in my new location. That was the longest and least relaxing vacation I've ever taken. Fun, yes. Relaxing, no. And to top it off, my kitchen is not done yet. We're shooting for being able to run water tonight and actually use appliances Read More... Posted Wednesday, January 07, 2004 12:28 PM by Eric Lippert | 10 Comments Filed under: JScript .NET, JScript, Scripting

• The JScript Type System Part Eight: The Last Blog Entry About Arrays, I Promise

  What happens when you assign a hard-typed CLR array to a variable annotated with a different CLR array type? Read More... Posted Friday, December 05, 2003 1:12 PM by Eric Lippert | 1 Comments Filed under: JScript .NET, Scripting

• The JScript Type System Part Seven: Yeah, you've probably guessed that I wrote the array stuff

  As I mentioned earlier, when you try to use a JScript .NET array when a CLR array is expected, we create a copy. But when you go the other way, things are a little different. Rather than producing a copy, using a CLR array as a JScript .NET array "wraps it up". No copy is made. The operation is therefore efficient and preserves identity. Changes made to a wrapped array are preserved Read More... Posted Friday, November 21, 2003 1:23 PM by Eric Lippert | 4 Comments Filed under: JScript .NET, JScript, Scripting