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Anonymous function and local variables


Anonymous function and local variables

By : Howie Zhang
Date : November 18 2020, 03:49 PM
may help you . Half of the point of anonymous functions are that they can capture the context in which they're specified. It's extremely convenient to be able to do so - that's the "why" part.
The way the compiler does this is to create a new class in cases where it needs to. So your code would be converted to something like:
code :
void Test()
{
    TestHelper helper = new TestHelper();
    helper.x = 10;

    btn.Click += helper.Method;
}

private class TestHelper
{
    public int x = 10;

    public void Method(object sender, EventArgs e)
    {
        MessageBox.Show(x.ToString());
    }
}
for (int i = 0; i < 10; i++)
{
    int x = i;
    // Use with some anonymous function
}


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how to pass local variables when assigning mouseover via anonymous function?

how to pass local variables when assigning mouseover via anonymous function?


By : Prakash
Date : March 29 2020, 07:55 AM
Does that help I have a setup function that runs onload to add some behaviours to elements. The setup function passes arguments to the mouseover event but those arguments are being changed during the for loop because they are local references. , Try surrounding the contents of your for loop in a closure:
code :
for (var lot_id in lots) {
    (function(lid){
        //contents of for loop - use lid instead of lot_id    
    })(lot_id);
}
(function(lid){
    area.onmouseover = function(){ showLot(lid, area, coords, details, image, map, areas, lots) };
})(lot_id);
How can I access local variables from inside a C++11 anonymous function?

How can I access local variables from inside a C++11 anonymous function?


By : user3430474
Date : March 29 2020, 07:55 AM
I hope this helps . I'm doing a simple normalization on a vector (weights), trying to make use of STL algorithms to make the code as clean as possible (I realize this is pretty trivial with for loops): , You need a closure.
code :
float tot = std::accumulate(weights.begin(), weights.end(), 0);
std::transform(weights.begin(), weights.end(), [tot](float x)->float{return(x/tot);});
local variables scope in anonymous function objects in Ruby

local variables scope in anonymous function objects in Ruby


By : Joeri DC
Date : March 29 2020, 07:55 AM
I wish this helpful for you When you create an anonymous function (a lambda or Proc), you give it a block, which is the body of the function, like so:
code :
-> { this_is_the_function_body }
Proc.new { this_is_the_function_body }
def my_lambda
  text = 'foo bar baz'
  -> { "text is: #{text}" }
end

l = my_lambda
text       #=> #<NameError: undefined local variable or method `text' for main:Object>
l.inspect  #=> "#<Proc:0x007f9863865a80@(pry):3 (lambda)>"
l.call     #=> "foo bar baz"
text = 'something else'
l.call  #=> "foo bar baz"
class C
  def f; -> { g }; end
  def g; 'foo'; end
end

C.new.f.call  #=> "foo"
javascript: pass local variables to anonymous function

javascript: pass local variables to anonymous function


By : user2023838
Date : March 29 2020, 07:55 AM
will help you You can pass it in as event data
code :
for (var i in plugin.buttons) {
    var button = plugin.buttons[i];
    var icon = button.icon;
    var text = button.text;
    var shortcut = button.shortcut;
    var action = button.action; //action is a function ( or method )

    if (shortcut != null && shortcut.length > 0) {
        if ($.isFunction(action)) {

            $('div[contenteditable]').on('keydown', {shortcut : shortcut}, function (e) {

                console.log(e.data.shortcut);

            });
        }
    }
}
for (var key in plugin.buttons) {
    (function(i) {
        var button = plugin.buttons[i];
        var icon = button.icon;
        var text = button.text;
        var shortcut = button.shortcut;
        var action = button.action; //action is a function ( or method )

        if (shortcut != null && shortcut.length > 0) {
            if ($.isFunction(action)) {
                console.log(shortcut); //it's valid shortcut
                //using jQuery hotkey plugin
                $('div[contenteditable]').bind('keydown', shortcut, function () {
                    console.log(shortcut); //it's undefined
                    action.call(); //it's undefined also
                    return false;
                });
            }
        }
    })(key);
}
How can I expose local variables defined in anonymous function to the global space?

How can I expose local variables defined in anonymous function to the global space?


By : nilu desilva
Date : March 29 2020, 07:55 AM
With these it helps Use a revealing module pattern:
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