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I have started to study Go and I am trying to understand what happens below:
time.Sleep(1000 * time.Millisecond) // Works
time.Sleep("1000ms") // Doesn't work
If you print to the console time.Milliseconds you can see 1ms. So I think that I can simply call that method with the value "1000ms", but I get an error. Next I searched for operator overloading in Go, but it doesn't support it. I understand that time.Sleep gets the time.Milliseconds data type, but how does Go allow it if it doesn't support overloading operators like *?
Sleep() accept a Duration type which is int64. So you can't pass string type object as an argument without typecasting it.
You got the output 1ms because of this method
(time.Duration) String() string
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od_practice.partnerships.kept.first&.omd_practice&.id
I have seen people use the word kept.first to pull data from database in ruby on rail . What does these words mean ? i have tried to do some research and i seem not find any solution. Can someone explain me please ?
This is called a message send in Ruby. In some other languages, it might be called a method call.
It is sending the message kept with no arguments to the object that was the result of evaluating the beginning of the message chain. This message send will in turn result in an object being returned, and it is then sending the message first to that object, again with no arguments.
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So I have been learning discord.py and keep getting stuck in the same part. I don't know what ctx and arg mean. I can't find much in their documentation. I've seen it like ctx.send or async def blank(ctx). What does it do and what use cases would it be used for?
ctx is short for context. It is used by discord.ext.commands and includes information like who executed the command, where it was executed and so on. ctx.send() is basically a helper function which makes your life easier. You can read its description in the docs to find out how it works and what it does. You just need to read it.
arg is short for argument. It is usually used as a variable length argument list.
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I am using GoLand IDE for Golang development. Just wondering if there is a way to find the list of functions implemented for a given struct or a type?
Just found out, it is CTRL+Q (cursor on the type) to get the list of functions for a given type or struct.
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I have strings like:
NoMethodError: undefined method 'sort_by!' for #<Hash:0x00007f98f03c84e0>
These strings can contain n number of such parts: <Hash:0x00007f98f03c84e0>.
Here, 0x00007f98f03c84e0 is just a placeholder of memory reference. And also Hash is type of object of which this memory reference is. There is no need to discuss how these strings got formed but in the end i have strings which can have anything like <ClassName:MEM_REF> and i have to replace MEM_REF part.
Going back to my original example, I want to remove this memory ref part 0x00007f98f03c84e0 with any string of my liking. Again, 0x00007f98f03c84e0 is an example, it will be any arbitrary memory address.
Looking for an elegant way of doing this in ruby.
Try following regex in ruby console, should work: /:[0-9]x[0-9A-Za-z]*(?=>)/.
And to mask these refs with anything else, try input_string.gsub!(/:[0-9]x[0-9A-Za-z]*(?=>)/, "REPLACE_TEXT")
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It is possible to call define_method directly or from within a method call that accepts a block. But is it possible to create a new method or keyword that performs manipulation on code and then declares it into a method, but has the same syntax as the built-in def?
No. You can define a method, but you cannot define a keyword. Whatever method you define on the Module class, you cannot pass a method body to it without the do keyword, unlike with def.