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I have looked through stackoverflow trying to figure this out, since I see alot of questions titled the same as mine. But I get this parse error in a Haskell file which worked perfectly the last time I opened it. I get this error-message
One defines a signature for a function by writing the name of the function, then two consecutive colons (::), and then the signature. You forgot the double colon, you thus write the signature of your concat function with:
-- ↓↓ double colon
concat :: [[a]] -> [a]
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I have a long object update.PostType.RecievedFrom.Id that I need to access many times inside my program,
but I want to shorten it, so it will be more readable, by creating a variable for it id := update.PostType.RecievedFrom.Id. now my question is would this variable be a "zero overhead" variable and will be just replaced as a macro in compile time, or it does affect my program (and if it is, how can I avoid it?)
will be just replaced as a macro in compile time [?]
No.
or it does affect my program
Yes, but in a totally negligible way
(and if it is, how can I avoid it?)
You cannot and you should not bother.
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What is problem? I don't understand.
There are 2 things that could be happening. First, you meant to list Article.all, referencing the class. Second, you're referencing article.all as a array, in which case it hasn't been defined as such in your code.
Also, please don't post images of code. Just copy/paste and use the code formatting tools. It really helps us understand what is going on.
Also, it helps to give as much background as possible, meaning what the code is supposed to do, why you're doing it, etc. The more thorough you are, the more helpful we can be.
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How to change string a type value to complex number?
I need to perform arithmetic operations on complex numbers which are passed through command line arguments.
For example:
go run file.go 3-4i + 7+2i
Starting from Go 1.15, there is a ParseComplex function in the strconv package:
https://golang.org/pkg/strconv/#ParseComplex
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I have tried the following:
iconv('ISO-8859-1', 'UTF-8//IGNORE', 'BIG5', $input);
However, it fails and produces this error:
iconv() expects exactly 3 parameters, 4 given
Check the official documentation:
http://php.net/manual/en/function.iconv.php
You're passing an extra argument to the function.
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myhash = {answer: "yes", something: hello, another: "yes"}
myhash.delete[another]
I want to delete the another key-value pair. But, ruby gives me an error saying wrong number of arguments (0 for 1). What's going on?
the method delete is a method, not an element on the hash , and another key is a symbol, so you should call on this form
myhash.delete(:another)