c# var
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The advantage of var is if
"http://someapi"was a variable or class instance instead of a string literal and you changed its type, you would not then need to refactor the code elsewhere. In your example it's just a case of habit probably, however it's obvious from what is on the right that it's a string. It can sometimes make it harder to debug issues as jumping to the class definition might not always be supported in the IDE you use to debug thevar urlvalue with or have to wait for the IDE to resolve the type that thevaris. That's my take onvar...“That which can be asserted without evidence, can be dismissed without evidence.”
― Christopher Hitchens
GuyThiebaut wrote:
The advantage of var is if
"http://someapi"was a variable or class instance instead of a string literal and you changed its type, you would not then need to refactor the code elsewhere."O, that way madness lies; let me shun that!" (King Lear)
«One day it will have to be officially admitted that what we have christened reality is an even greater illusion than the world of dreams.» Salvador Dali
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OriginalGriff wrote:
that would be a more natural way of showing what the type
Yup. And as I replied on the Insider News, what I really want is:
var foo = new();In most cases, the compiler should be able to figure out whatfoois by inspecting its usage in the code! :laugh:Latest Articles:
Abusing Extension Methods, Null Continuation, and Null Coalescence OperatorsMarc Clifton wrote:
In most cases, the compiler should be able to figure out what
foois by inspecting its usage in the code!If you turn the compiler into a psychic, be prepared for bad news :wtf:
«One day it will have to be officially admitted that what we have christened reality is an even greater illusion than the world of dreams.» Salvador Dali
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GuyThiebaut wrote:
The advantage of var is if
"http://someapi"was a variable or class instance instead of a string literal and you changed its type, you would not then need to refactor the code elsewhere."O, that way madness lies; let me shun that!" (King Lear)
«One day it will have to be officially admitted that what we have christened reality is an even greater illusion than the world of dreams.» Salvador Dali
Tell me about it, I have been coding in Kotlin for an Android application and in Kotlin pretty much every type is inferred. So the code is peppered with
itwhen referring to a property anditcan be pretty much anything.“That which can be asserted without evidence, can be dismissed without evidence.”
― Christopher Hitchens
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What is the love affair with var? I see sample code where they do something like
var url = "http://someapi";
This feels lazy to me but I am open minded and am curious if I am missing something. Is there some benefit to declaring most things var instead of what they actually are? In the case above, a string.
Social Media - A platform that makes it easier for the crazies to find each other. Everyone is born right handed. Only the strongest overcome it. Fight for left-handed rights and hand equality.
The C# "var" construct and other such constructs in both C# and VB.NET are merely short-cuts or the usage of system defaults. This makes for very ambiguous code over the length of an application's development. This is why I don't even use the generic list-type and still use array-lists instead. Despite the slight performance decreases (which most will not notice since such constructs often do not contain thousands of objects or items in general), having easy to read strongly typed code makes my applications much more easily maintainable.
Steve Naidamast Sr. Software Engineer Black Falcon Software, Inc. blackfalconsoftware@outlook.com
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What is the love affair with var? I see sample code where they do something like
var url = "http://someapi";
This feels lazy to me but I am open minded and am curious if I am missing something. Is there some benefit to declaring most things var instead of what they actually are? In the case above, a string.
Social Media - A platform that makes it easier for the crazies to find each other. Everyone is born right handed. Only the strongest overcome it. Fight for left-handed rights and hand equality.
The last place I worked would fail you in code reviews if you did not use var. Their (ill) logic was something to do with a design pattern, and when Entity Framework would cough on var, they added lines of code to get it to pass instead of just using the correct type.
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What is the love affair with var? I see sample code where they do something like
var url = "http://someapi";
This feels lazy to me but I am open minded and am curious if I am missing something. Is there some benefit to declaring most things var instead of what they actually are? In the case above, a string.
Social Media - A platform that makes it easier for the crazies to find each other. Everyone is born right handed. Only the strongest overcome it. Fight for left-handed rights and hand equality.
I (almost) only use var for non-production code, when I'm writing from whole cloth and doing initial diagnostics. As the code matures, I replace (almost) all instances of
varwith the actual types. Great way to force you to review and refactor before release. For very long types, I'll usevar, but only when the type is already included in the same location, like a declaration and instantiation. -
What is the love affair with var? I see sample code where they do something like
var url = "http://someapi";
This feels lazy to me but I am open minded and am curious if I am missing something. Is there some benefit to declaring most things var instead of what they actually are? In the case above, a string.
Social Media - A platform that makes it easier for the crazies to find each other. Everyone is born right handed. Only the strongest overcome it. Fight for left-handed rights and hand equality.
Apart from the obvious (it saves typing and you have a set maximum number of keystrokes you can make in your life), it also allows for alignment which makes things easier to read (we're better with vertical scanning than horizontal scanning - for more see: https://www.youtube.com/watch?v=ZsHMHukIlJY and also there's just plain less to read!) but also because consuming code is more likely to survive a refactor intact: changing return type to something with similar shape means no consumer changes, renames of classes don't have to alter as many lines of code. Since it's syntactic sugar, it costs nothing at runtime and it's normally one of the first automated fixes I do in a file when I enter legacy code.
------------------------------------------------ If you say that getting the money is the most important thing You will spend your life completely wasting your time You will be doing things you don't like doing In order to go on living That is, to go on doing things you don't like doing Which is stupid. - Alan Watts https://www.youtube.com/watch?v=-gXTZM\_uPMY
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What is the love affair with var? I see sample code where they do something like
var url = "http://someapi";
This feels lazy to me but I am open minded and am curious if I am missing something. Is there some benefit to declaring most things var instead of what they actually are? In the case above, a string.
Social Media - A platform that makes it easier for the crazies to find each other. Everyone is born right handed. Only the strongest overcome it. Fight for left-handed rights and hand equality.
I've read that convention is to use "var" when the type of variable is apparent by reading the code. If you printed out this code it would still be pretty obvious that "url" is a string. If you can't tell the type by reading the code then the actual type should be used. It is lazy but if it eliminates some redundancy and makes coding a little quicker than it's a good thing. I personally follow the convention above but I know some people use var for everything.
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What is the love affair with var? I see sample code where they do something like
var url = "http://someapi";
This feels lazy to me but I am open minded and am curious if I am missing something. Is there some benefit to declaring most things var instead of what they actually are? In the case above, a string.
Social Media - A platform that makes it easier for the crazies to find each other. Everyone is born right handed. Only the strongest overcome it. Fight for left-handed rights and hand equality.
Actually your example is quite interesting, as it isn't really a String but rather Uri. The correct way to declare it would have been
using System;
...
Uri url = new Uri("http://www.contoso.com/");WebRequest wr = WebRequest.Create(siteUri);
But as you might have figured, you could have just used this instead
var url = new Uri("http://www.contoso.com/");
var wr = WebRequest.Create(siteUri);
or just
var url = "http:// www. contoso.com/";
var request = WebRequest.Create (url); -
Actually your example is quite interesting, as it isn't really a String but rather Uri. The correct way to declare it would have been
using System;
...
Uri url = new Uri("http://www.contoso.com/");WebRequest wr = WebRequest.Create(siteUri);
But as you might have figured, you could have just used this instead
var url = new Uri("http://www.contoso.com/");
var wr = WebRequest.Create(siteUri);
or just
var url = "http:// www. contoso.com/";
var request = WebRequest.Create (url);Member 2896020 wrote:
var url = "http:// www. contoso.com/"; var request = WebRequest.Create (url);
Which is essentially what it was. But url is a string. I don't see the value in typing var instead of string.
Social Media - A platform that makes it easier for the crazies to find each other. Everyone is born right handed. Only the strongest overcome it. Fight for left-handed rights and hand equality.
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VB doesn't have
var? :confused: The equivalent would be:Dim something = "my string"
Which looks fine to me and is still strongly typed, unless Options Strict is Off.
Mycroft Holmes wrote:
As for
varcontent changing type and not having to refactorUsing
varis strongly typed so I don't really get what you're saying. Are you thinking ofdynamicorOption Strict Off(which luckily DOESN'T have an equivalent in C# X| )?Best, Sander sanderrossel.com Migrating Applications to the Cloud with Azure arrgh.js - Bringing LINQ to JavaScript Object-Oriented Programming in C# Succinctly
I use c# and almost never use var, and the content changing comment was a response to some of the previous posts.
Never underestimate the power of human stupidity - RAH I'm old. I know stuff - JSOP
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I'd actually prefer it is you could do this:
Dictionary> complicatedDictionary = new *();
To me, that would be a more natural way of showing what the type of
complicatedDictionaryactually is. As it is, I findvaris mainly over used by the lazy-and-don't-care script kiddies ..."I have no idea what I did, but I'm taking full credit for it." - ThisOldTony AntiTwitter: @DalekDave is now a follower!
C# 9.0 will have it: [Welcome to C# 9.0 | .NET Blog](https://devblogs.microsoft.com/dotnet/welcome-to-c-9-0/#target-typed-new-expressions)
To alcohol! The cause of, and solution to, all of life's problems - Homer Simpson ---- Our heads are round so our thoughts can change direction - Francis Picabia
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What is the love affair with var? I see sample code where they do something like
var url = "http://someapi";
This feels lazy to me but I am open minded and am curious if I am missing something. Is there some benefit to declaring most things var instead of what they actually are? In the case above, a string.
Social Media - A platform that makes it easier for the crazies to find each other. Everyone is born right handed. Only the strongest overcome it. Fight for left-handed rights and hand equality.
The problem is that it sometimes becomes a style guideline in teams. I have seen that happening before, which is just stupid to me. "Oh, but you can just hover over it and you will see". This mindset can be a real nightmare on code reviews. I hate the laziness that motivated most var uses I have seen. People don't even know why var was created (to support anonymous types). There are though, as some people have already mentioned, some situations where var makes the code cleaner. But I actually never seen that kind of diligence, so wherever I could I abolished the used of var for non anonymous types. To make matters worse, stupid resharper (that some people like to use) has the default setting that everything should be var. So it pretty much converts the new-comers to the var mindset from the start.
To alcohol! The cause of, and solution to, all of life's problems - Homer Simpson ---- Our heads are round so our thoughts can change direction - Francis Picabia
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What is the love affair with var? I see sample code where they do something like
var url = "http://someapi";
This feels lazy to me but I am open minded and am curious if I am missing something. Is there some benefit to declaring most things var instead of what they actually are? In the case above, a string.
Social Media - A platform that makes it easier for the crazies to find each other. Everyone is born right handed. Only the strongest overcome it. Fight for left-handed rights and hand equality.
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I'd actually prefer it is you could do this:
Dictionary> complicatedDictionary = new *();
To me, that would be a more natural way of showing what the type of
complicatedDictionaryactually is. As it is, I findvaris mainly over used by the lazy-and-don't-care script kiddies ..."I have no idea what I did, but I'm taking full credit for it." - ThisOldTony AntiTwitter: @DalekDave is now a follower!
Dictionary> complicatedDictionary = new ();
Is on the planned list for C# 9.0.
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What is the love affair with var? I see sample code where they do something like
var url = "http://someapi";
This feels lazy to me but I am open minded and am curious if I am missing something. Is there some benefit to declaring most things var instead of what they actually are? In the case above, a string.
Social Media - A platform that makes it easier for the crazies to find each other. Everyone is born right handed. Only the strongest overcome it. Fight for left-handed rights and hand equality.
In my experience, the need to use var arises from wanting to hide the sometimes lengthy names of collection iterators in foreach declarations. Especially when Linq is used to get the collection, the declaration can become messy. But you now how it goes: first it's to shorten lengthy iterator names, then lengthy class names, then pretty much everywhere because it looks more consistent for some people. I can support the use in foreach declarations, but everywhere else it's more of an annoyance. I never understood the desire to hide stuff like this. It's like an unspoken commitment to never refactor whatever is hidden. On a related note: Regions. Why?
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What is the love affair with var? I see sample code where they do something like
var url = "http://someapi";
This feels lazy to me but I am open minded and am curious if I am missing something. Is there some benefit to declaring most things var instead of what they actually are? In the case above, a string.
Social Media - A platform that makes it easier for the crazies to find each other. Everyone is born right handed. Only the strongest overcome it. Fight for left-handed rights and hand equality.
I really like the short notation. When I need to know what type the variable is, I hover the mouse cursor over it and it will show the actual type. And so long as I am not paid by the character, I will use the shortest notation I can use.:cool:
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What is the love affair with var? I see sample code where they do something like
var url = "http://someapi";
This feels lazy to me but I am open minded and am curious if I am missing something. Is there some benefit to declaring most things var instead of what they actually are? In the case above, a string.
Social Media - A platform that makes it easier for the crazies to find each other. Everyone is born right handed. Only the strongest overcome it. Fight for left-handed rights and hand equality.
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What is the love affair with var? I see sample code where they do something like
var url = "http://someapi";
This feels lazy to me but I am open minded and am curious if I am missing something. Is there some benefit to declaring most things var instead of what they actually are? In the case above, a string.
Social Media - A platform that makes it easier for the crazies to find each other. Everyone is born right handed. Only the strongest overcome it. Fight for left-handed rights and hand equality.
There is no advantage. If you just write a scribble, then always using var is Ok. But if you write production-level code, var is sloppy style and thus an absolute no-go. Before IntelliSense was able to automatically convert the var's in your source code to the correct type, var was even an evidence of a programmer not knowing what type they're using. Only exception: Use var to avoid writing the same type twice in the same line. Bad
List list = new List();
Good
var list = new List();
Because then, when you want to change the type, let's say from List to HashSet, you only have to change it once. IntelliSense also suggests this, at least in VS 2017.
