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Difference between ref and out parameters in .NET [duplicate]
What is the difference between ref and out parameters in .NET? What are the situations where one can be more useful than the other? What would be a code snippet where one can be used and another can't?
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rails simple_form - hidden field - create?
... this:
= simple_form_for @movie do |f|
= f.hidden :title, :value => params[:movie][:title]
= f.button :submit
Again only use my answer is you do not want to reset the value submitted by the user.
I hope this makes sense.
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git difftool, open all diff files immediately, not in serial
...-cached
git diffall rev1..rev2
etc...
Notes: The key to it is the & param which tells the external diff command to run in a background task so files are processed immediately. In the case of BeyondCompare this opens one screen with each file in its own tab.
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Facebook Open Graph not clearing cache
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param fbrefresh might not be necessary as the debug tool refreshes the object without it.
– alexandru.topliceanu
Mar 25 '12 at 20:23
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How to get city name from latitude and longitude coordinates in Google Maps?
...gitude;
}
@Override
protected String doInBackground(String... params) {
String result = "";
Geocoder geocoder = new Geocoder(act, Locale.getDefault());
try {
List<Address> addresses = geocoder.getFromLocation(latitude,
longit...
What are the most common naming conventions in C?
...me, method name, typedef
this_is_my_convention global and local variables,
parameters, struct and union elements
thisismyconvention [optional] very local and temporary variables (such like a for() loop index)
And that's it.
It gives
class MyClass {
enum TheEnumeration {
FIRST_ELEMEN...
Getting the name of a variable as a string
...ets the name of var. Does it from the out most frame inner-wards.
:param var: variable to get name from.
:return: string
"""
for fi in reversed(inspect.stack()):
names = [var_name for var_name, var_val in fi.frame.f_locals.items() if var_val is var]
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Ruby on Rails form_for select field with class
...or html options. So all you need is to give default empty options as first param after list of items and then add your class to html_options.
http://api.rubyonrails.org/classes/ActionView/Helpers/FormOptionsHelper.html#method-i-select
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git command to show all (lightweight) tags creation dates
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@revelt git >= 2.0 provides a sort param. Put a minus in to reverse the order. git tag -l --sort=-creatordate --format='%(creatordate:short)|%(refname:short)'
– con--
Apr 4 '19 at 13:24
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How does one use rescue in Ruby without the begin and end block
...n a lot with ActiveRecord validations:
def create
@person = Person.new(params[:person])
@person.save!
redirect_to @person
rescue ActiveRecord::RecordInvalid
render :action => :new
end
I think this is very lean code!
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