useless assignment to variable ruby

I have a Ruby function that returns a single variable subsequently used by the caller however I get the following warning warning: assigned but unused variable I have put together a contrived ... Understanding "Useless assignment to variable" Ask Question Asked 9 years, 11 months ago. Modified 9 years, 11 months ago. Viewed 15k times

1. RuboCop is trying to tell you that a useless variable exists in your code, but before fix that we need to talk about a bug happening right here: (user_age, user_name) = user_input. In Ruby, a method returns the last line of code. Looking at the method user_input we can see that it returns only the user_name variable.

= is assignment and since 'Y' is true the if block will always run and the else block will never run. == is a comparison operator and will be conditional. basically you are stating if true # do something rather than if something == true #do something -

Checks for every useless assignment to local variable in every scope. The basic idea for this cop was from the warning of 'ruby -cw`: source,console assigned but unused variable - foo. Currently this cop has advanced logic that detects unreferenced reassignments and properly handles varied cases such as branch, loop, rescue, ensure, etc. ...

Checks for every useless assignment to local variable in every scope. The basic idea for this cop was from the warning of ruby -cw: assigned but unused variable - foo. Currently this cop has advanced logic that detects unreferenced reassignments and properly handles varied cases such as branch, loop, rescue, ensure, etc.

main.rb:6:3: W: Lint/UselessAssignment: Useless assignment to variable - a. a = 1. This also happens with block. Lint/UnusedMethodArgument is ... behavior. If parentheses don't exist, some_method a { puts 1 } is interpreted same as some_method(a { puts 1 }) by Ruby. So, the a identifier is not used as a local variable. It is used as a method ...

This was a problem with Enumerator#each_with_object. Behavior Useless assignment to variable - s. Use just operator |. (Lint/UselessAssignment) Reproduction printf "s = Set.new\ns |= [:a, :b]" > test.rb && \ bundle exec rubocop test.rb Expected It not to say that, |= is like | when it's no...

Overview. This cop checks for every useless assignment to local variable in every scope. The basic idea for this cop was from the warning of ruby -cw: assigned but unused variable - foo. Currently this cop has advanced logic that detects unreferenced reassignments and properly handles varied cases such as branch, loop, rescue, ensure, etc.

The following code produces an error "Lint/UselessAssignment: Useless assignment to variable - x" when it shouldn't. x = Thread.current['x'] || Object module x::Foo ...

Expected behavior When assigning to a variable in a rails model, it should check its schema to see if "new variables" are declared for the model. Actual behavior I assign a value to a variable in a...

You create variables by associating a Ruby object with a variable name. We call this "variable assignment". Example: age = 32. Now when you type age Ruby will translate that into 32. Try it! There is nothing special about the word age. You could use bacon = 32 & the value would still be 32. Variables are just names for things.

Assignment. In Ruby, assignment uses the = (equals sign) character. This example assigns the number five to the local variable v: v = 5. Assignment creates a local variable if the variable was not previously referenced. An assignment expression result is always the assigned value, including assignment methods.

This cop checks for every useless assignment to local variable in every scope. The basic idea for this cop was from the warning of 'ruby -cw`: assigned but unused variable-foo. Currently this cop has advanced logic that detects unreferenced reassignments and properly handles varied cases such as branch, loop, rescue, ensure, etc.

Rubocopエラー「Useless assignment to variable」の解決例. 上記エラーを調べると、「使っていないローカル変数の定義がある」というエラーのようで 削除すれば解決するとの事でした。 しかし、今回はちゃんと使っている内容で、書き方の問題のようでした。

Precision: very-high. Tags: - maintainability. - external/cwe/cwe-563. Query suites: - csharp-security-and-quality.qls. Click to see the query in the CodeQL repository. A value is assigned to a local variable, but either that variable is never read later on, or its value is always overwritten before being read.

Successfully merging a pull request may close this issue. [Fix #9762] Update VariableForce to be able to handle case-match nodes dvandersluis/rubocop. 2 participants. Expected behavior In the following example, res is obviously needed: def f case '0' in String res = 1 else res = 2 end res end puts f so Lint/UselessAssignment should not claim it ...

The following example shows a simple struct type wrapping an integer counter with a method reset that sets the counter to zero. package main type counter struct { val int } func (c counter) reset() { c.val = 0 } However, the receiver variable of reset is declared to be of type counter, not *counter, so the receiver value is passed into the ...

Removing the output would make sense if the text box is just used to display a result like the "pass" and "fail" in the thread Luc had linked to. In this case its useless to have to assign the textbox to a variable which we do not intend to use. Of course we can assign the box to a dummy variable and then hide and collapse the left hand side of ...

rubocop / ruby-style-guide Public. Notifications Fork 3.4k; Star 16.4k. Code; Issues 53; Pull requests 8; Actions; Projects 0; Security; Insights New issue Have a question about this project? ... Issue with "Useless assignment to variable". #388. Closed akarmes opened this issue Nov 21, 2014 · 1 comment Closed Issue with "Useless assignment to ...

Yes, it will. It's an instance variable. In ruby, if you prefix your variable with @, it makes the variable an instance variable that will be available outside the block. In addition to that, Ruby does not have block scope (block in the traditional sense, if/then/else in this case).

…eference! The modifier `if` and `unless` expressions were fixed in [fca7d43][], but it didn't also fix it for the modifier forms of `while` and `until`.This commit builds on that commit so that the following code no longer fails the Lint/UselessAssignment cop: ``` middleware = nil middleware.call(env) while (middleware = rack_middleware.next) ``` [fca7d43]: rubocop@fca7d43