I am learning elm from this book when i try build this project i always get
the error that Cannot find variable List
link of book -: https://www.elm-tutorial.org/en/05-resources/02-models.html
**strong text**Cannot find variable `List`
12| List players
^^^^
Maybe you want one of the following?
list
Just
Html.Attributes.list
Maybe.Just
If this is inside the file List.elm in your Players folder, maybe you should change it to a lowercase list. That function is defined in that same file.
Try:
, list players
on line 12 of the file Players/List.elm
Related
At somepoint there was an update to some functionality and now the following doesnt work on robotframework anymore
${row.find_elements_by_tag_name('td')}
I cant seem to fix this and cant find much support
I believe the new way is done by using by.TAG_NAME() or something like that
For context im getting the table rows (tr) and storing it in a list, for each tr I want to get the table divisions (td) so I can create a list of each tr but have access to the td within.
This is done so I can check a csv file matches the table when exported
Below is the section of code
#{severity_list}= Create List
FOR ${page} IN RANGE 99999
#{rows}= Get Alarms Table Rows
FOR ${row} IN #{rows}
#{elements}= Set Variable ${row.find_elements_by_tag_name('td')}
# Train Severity List
#{train_severity}= Create List
Append To List ${train_severity} ${elements[2].text}
Append To List ${train_severity} ${elements[3].text}
# Get Severity value
Append To List ${severity_list} ${train_severity}
END
I believe the new way is done by using by.TAG_NAME() or something like that
ERROR Message:Resolving variable '${row.find_elements_by_tag_name('td')}' failed:
AttributeError: 'WebElement' object has no attribute 'find_elements_by_tag_name'
I have a search that is working fine
index=event_db environment=prod release = 2020150015
| timechart count as Events
However, I'd like to modify this to search for any release in an array of releases. I'm aware of the "in" operator.
The catch is that the array of releases I've been provided ("Releases") is formatted slightly differently like so:
[ver2020.15.0015, ver2020.15.0016, ver2020.22.0019] // in general, many more than 3!
Is there a way to use the in operator and some mapping to get
release in
[2020150015, 2020150016, 2020220019] ?
Can this be put in the search?
This is part of a panel so if it's simpler I could have code elsewhere to convert [ver2020.15.0015, ver2020.15.0016, ver2020.22.0019] into [2020150015, 2020150016, 2020220019]
However, as mentioned I'm a newbie so my knowledge of where to put code to transform an array is limited :)
I have a fieldset section and a panel with a query in it.
The "Releases" array is populated in the fieldset section as so:
<input type="text" token="Releases">
<label>Release or Releases</label>
<default>*</default>
</input>
The user enters ver2020.15.0015 or perhaps ver2020.15.*.
I can't just have the user enter 2020150015 as the ver2020.15.0015 format is used elsewhere.
Perhaps there's a way to create new field Releases_Alt right after getting this?
Let me know of any other info I can provide. As I said, I'm new to Splunk so I'm still struggling with terminology.
Try this query. It uses a subsearch to build the IN argument. Subsearches in Splunk run before the main search and the output of the subsearch replaces the subsearch itself.
index=event_db environment=prod release IN (
[ | makeresults
| eval Releases=replace ($Releases|s$, "[ver\.]+","")
| return $Releases ] )
| timechart count as Events
The makeresults command is there because even subsearches have to start with a generating command. makeresults creates a "dummy" event that allows other commands to work.
The eval command does the work of converting release versions into the desired format. Note the use of |s with the Releases token. This construct ensures the contents of the token are enclosed in quotation marks, which is expected by the replace function.
Finally, the return command with $ returns the results of the eval, but without the field name itself. Without it, the subsearch would return releases="2020150015, 2020150016, 2020220019", which wouldn't work.
I am trying to separate files in an Elm project, as keeping everything in global Model, Messages, etc. would be just a mess.
Here is how I tried it so far:
So, there are some global files, and then Header has its own files. However I keep getting error, when importing Header.View into my global View:
The 1st and 2nd entries in this list are different types of values.
Which kind of makes sense:
The 1st entry has this type:
Html Header.Messages.Msg
But the 2nd is:
Html Msg
So, my question is whether all the messages (from all my modules, like Header) needs to be combined somehow in global Messages.elm? Or there is a better way of doing this?
My advice would be to keep messages and update in 1 file until that feels uncomfortable (for you to decide how many lines of code that means - see Evan's Elm Europe talk for more on the modules flow). When you want to break something out, define a new message in Main
type Msg
= HeaderMsg Header.Msg
| ....
Then use Cmd.map HeaderMsg in your update function and Html.map HeaderMsg in your view function to connect up your sub-components
I am trying to create a Lua program using Sublime and Corona. I want to fetch a webpage, use a pattern to extract certain text from the page, and then save the extracted text into a table. I am using the network.request method provided by Corona
The problem: The extracted text is not saving into the global variable I created. Whenever I try to reference it or print it outside of the function it returns nil. Any ideas why this is happening?
I have attached a screen shot of my event.response output. This is what I want to be saved into my Lua table
Event.response Output
Here is my code:
local restaurants = {}
yelpString = ""
--this method tells the program what to do once the website is retrieved
local function networkListener( event )
if ( event.isError ) then
print( "Network error: ", event.response )
else
yelpString = event.response
--loops through the website to find the pattern that extracts
restaurant names and prints it out
for i in string.gmatch(yelpString, "<span >(.-)<") do
table.insert(restaurants, i)
print(i)
end
end
end
-- retrieves the website
network.request( "https://www.yelp.com/search?
cflt=restaurants&find_loc=Cleveland%2C+OH%2C+US", "GET", networkListener )
This sounds like a scoping problem. From the output you give, it looks like networkListener is being called, and you are successfully adding the text into the restaurants table. Moreover, since you define restaurants as a table, it should be a table when you reference it, not nil. So by deduction, the issue must be that you are trying to access the restaurants table from somewhere where it is not in scope.
If you declare restaurants as "local" in the top level of a file (i.e. not within a function or a block), it will be accessible to the whole file, but it won't be accessible to anything outside the file. So the table.insert(restaurants, i) in your code will work, but if you try to reference restaurants from somewhere outside the file, it will be nil. I'm guessing this is the cause of the problems that you are running into.
For more details on scope, have a look at the Programming in Lua book. The book is for Lua 5.0, but the scoping rules for local variables have not changed in later versions of Lua (as of this writing, the latest is Lua 5.3).
I'm pretty new to Elixir and functional programming-languages in general.
In Elixir, I want to call one specific function on Modules, given the Module name as String.
I've got the following (very bad) code working, which pretty much does what I want to:
module_name = elem(elem(Code.eval_file("module.ex", __DIR__), 0), 1)
apply(module_name, :helloWorld, [])
This (at least as I understand it) compiles the (already compiled) module of module.ex in the current directory. I'm extracting the modules name (not as a String, don't know what data-type it actually is) out of the two tuples and run the method helloWorld on it.
There are two problems with this code:
It prints a warning like redefining module Balance. I certainly don't want that to happen in production.
AFAIK this code compiles module.ex. But as module.ex is already compiled and loaded, it don't want that to happen.
I don't need to call methods on these modules by filename, the module-name would be ok too. But it does have to by dynamic, eg. entering "Book" at the command line should, after a check whether the module exists, call the function Book.helloWorld.
Thanks.
Well, thats where asking helps: You'll figure it out yourself the minute you ask. ;)
Just using apply(String.to_existing_atom("Elixir.Module"), :helloWorld, []) now. (maybe the name "Module" isn't allowed, don't know)
Note that you always need to prefix your modules with "Elixir."
defmodule Test do
def test(text) do
IO.puts("#{text}")
end
end
apply(String.to_existing_atom("Elixir.Test"), :test, ["test"])
prints "test"
and returns {:ok}
Here is a simple explanation:
Assuming that you have a module like this:
defmodule MyNamespace.Printer do
def print_hello(name) do
IO.puts("Hello, #{name}!")
end
end
Then you have a string that hold the module name that you can pass around in your application like this:
module_name = "Elixir.MyNamespace.Printer"
Whenever you receive the string module_name, you can instantiate a module and call functions on the module like this:
module = String.to_existing_atom(module_name)
module.print_hello("John")
It will print:
Hello, John!
Another way to dynamically call the function MyNamespace.Printer.print_hello/1 is:
print_hello_func = &module.print_hello/1
print_hello_func.("Jane")
It will print:
Hello, Jane!
Or if you want to have both module_name as atom and function_name as atom, and pass them around to be executed somewhere, you can write something like this:
a_module_name = :"Elixir.MyNamespace.Printer"
a_function_name = :print_hello
Then whenever you have a_module_name and a_function_name as atoms, you can call like this:
apply(a_module_name, a_function_name, ["Jackie"])
It will print
Hello, Jackie!
Of course you can pass module_name and function_name as strings and convert them to atoms later. Or you can pass module name as atom and function as a reference to function.
Also note that the name of a module is an atom so doing String.to_existing_atom isn't usually needed. Consider this code:
defmodule T do
def first([]), do: nil
def first([h|t]), do: h
end
In this case you can simply do the apply in this fashion:
apply(T,:first,[[1,2,3]])
#=> 1
Or this example (List below is the Elixir List module):
apply(List,:first,[[1,2,3]])
#=> 1
I mean to say that if you know the name of the module, it's not necessary to pass it as a string and then convert the string to an existing atom. Simply use the name without quotation marks.