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How to Replace only Part of the Variable using #define


How to Replace only Part of the Variable using #define

By : Hakan Suluoğlu
Date : January 10 2021, 01:57 PM
should help you out The pre-processor only operates on strings that are entire tokens. There would be chaos otherwise.
Try:
code :


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Is it possible to define a specific part of a string in an external file as a variable?

Is it possible to define a specific part of a string in an external file as a variable?


By : Wayne Kruger
Date : March 29 2020, 07:55 AM
seems to work fine If I understand your question correctly, you have some external data file in JSON format, whose structure has certain fields as XPath strings on which you would like to perform Ruby string interpolation.
The short answer is that yes, you can do this directly using, say Kernel#eval. There are also other options such as using erb. A solution using the simple "eval" route might look like this:
code :
xpaths = JSON.load(File.read('my-xpaths.json'))
(1..5).each do |i|
  xpath = eval(xpaths['location']['elements'].to_json)
  # => "//ul[@id='locations']/li[1]/a"
end
xpaths['location']['elements'] # => "//ul[@id='locations']/li[__INDEX__]/a"
xpath = xpaths['location']['elements'].gsub(/__INDEX__/, i.to_s)
# => "//ul[@id='locations']/li[1]/a"
.htaccess define url part as a variable

.htaccess define url part as a variable


By : Md Delower Hossain
Date : March 29 2020, 07:55 AM
like below fixes the issue In regex terms, you need to "capture" the stuff you want to later use in a "backreference".
code :
RewriteRule ^(\w{2})/support index.php?route=support/support&lang=$1 [L]
Define part of an Expression as a variable in c#

Define part of an Expression as a variable in c#


By : Sandip Panchani
Date : March 29 2020, 07:55 AM
I wish this helpful for you You can use the following helper functions (one could probably give them a better names, but that's not essential):
code :
public static class ExpressionUtils
{
    public static Expression<Func<TOuter, TResult>> Bind<TOuter, TInner, TResult>(this Expression<Func<TOuter, TInner>> source, Expression<Func<TInner, TResult>> resultSelector)
    {
        var body = new ParameterExpressionReplacer { source = resultSelector.Parameters[0], target = source.Body }.Visit(resultSelector.Body);
        var lambda = Expression.Lambda<Func<TOuter, TResult>>(body, source.Parameters);
        return lambda;
    }

    public static Expression<Func<TOuter, TResult>> ApplyTo<TInner, TResult, TOuter>(this Expression<Func<TInner, TResult>> source, Expression<Func<TOuter, TInner>> innerSelector)
    {
        return innerSelector.Bind(source);
    }

    class ParameterExpressionReplacer : ExpressionVisitor
    {
        public ParameterExpression source;
        public Expression target;
        protected override Expression VisitParameter(ParameterExpression node)
        {
            return node == source ? target : base.VisitParameter(node);
        }
    }
}
c.Criteria = x => x.Name.StartsWith("SomeTexts");
Expression<Func<Customer, string>> e = x => x.Name;
c.Criteria = e.Bind(x => x.StartsWith("SomeTexts"));
Expression<Func<string, bool>> e = x => x.StartsWith("SomeTexts");
c.Criteria = e.ApplyTo((Customer x) => x.Name);
EF + LINQ: How do I define and utilize a variable (maybe a Func variable) to define part of a Select statement?

EF + LINQ: How do I define and utilize a variable (maybe a Func variable) to define part of a Select statement?


By : Макс
Date : March 29 2020, 07:55 AM
it fixes the issue It's a completely valid question that I stumbeled across earlier and found a solution that works well for me.
The problem with your Func is that it is a delegate and that the O/R mapper has to have access to the internal expression (the multiplication of two properties in your case). But this information is compiled into the delegate and hidden forever.
code :
m => new MyViewModel { MyCalculation = customCalculation.Compile()(m) }
var customCalculation = (Expression<Func<MyEntity, decimal>>)(x => x.Column1 * x.Column2);
var selector = Express.Prepare((Expression<Func<MyEntity, MyViewModel>>)(m => new MyViewModel { MyCalculation = customCalculation.Compile()(m) }));
var result = query.Select(selector).ToList();
How to define a part of a directory path as a variable for further use using R?

How to define a part of a directory path as a variable for further use using R?


By : myadselldotcom
Date : March 29 2020, 07:55 AM
I hope this helps . I have a little question regarding the script that I would like to write using R. The problem is the following: , Something like the following should work:
code :
# Let users change this variable
personal_dir <- "C:/users/USER_1/Desktop"

# Create main folder
main_folder <- "Mainfolder"
main_folder_path <- file.path(personal_dir, main_folder)
dir.create(main_folder_path)

# Create sub folder
sub_folder <- "Subfolder"
sub_folder_path <- file.path(personal_dir, main_folder, sub_folder)
dir.create(sub_folder_path)
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