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Printing all global variables/local variables?

How can I print all global variables/local variables? Is that possible in gdb?

MySQL: @variable vs. variable. Whats the difference?

In another question I posted someone told me that there is a difference between:

@variable

and:

variable

in MySQL. He also mentioned how MSSQL has batch scope and MySQL has session scope. Can someone elaborate on this for me?

Check if a variable is an object in javascript

How to check in JavaScript if a variable is an object?

Capturing multiple line output to a bash variable

I've got a script 'myscript' that outputs the following:

abc
def
ghi

in another script, I call:

declare RESULT=$(./myscript)

and $RESULT gets the value

abc def ghi

Is there a way to store the result either with the newlines, or with '\n' character so I can output it with 'echo -e'?

What is the purpose of the single underscore "_" variable in Python?

What is the meaning of _ after for in this code?

if tbh.bag:
   n = 0
   for _ in tbh.bag.atom_set():
      n += 1

Is there any way I can define a variable in LaTeX?

In LaTeX, how can I define a string variable whose content is used instead of the variable in the compiled PDF?

Let's say I'm writing a tech doc on a software and I want to define the package name in the preamble or somewhere so that if its name changes, I don't have to replace it in a lot of places but only in one place.

How do you check if a variable is an array in JavaScript? [duplicate]

I would like to check whether a variable is either an array or a single value in JavaScript.

I have found a possible solution...

if (variable.constructor == Array)...

Is this the best way this can be done?

Is there a better way of writing v = (v == 0 ? 1 : 0);

I want to toggle a variable between 0 and 1. If it's 0 I want to set it to 1, else if it's 1 I want to set it to 0.

This is such a fundamental operation that I write so often I'd like to investigate the shortest, clearest possible way of doing it. Here's my best so far:

v = (v == 0 ? 1 : 0);

Can you improve on this?

Edit: the question is asking how to write the above statement in the fewest characters while retaining clarity - how is this 'not a real question'? This wasn't intended to be a code-golf exercise, though some interesting answers have come out of people approaching it as golf - it's nice to see golf being used in a constructive and thought-provoking manner.

How to trim whitespace from a Bash variable?

I have a shell script with this code:

var=`hg st -R "$path"`
if [ -n "$var" ]; then
    echo $var
fi

But the conditional code always executes, because hg st always prints at least one newline character.

• Is there a simple way to strip whitespace from $var (like trim() in PHP)?

or

• Is there a standard way of dealing with this issue?

I could use sed or AWK, but I'd like to think there is a more elegant solution to this problem.

Semantic Issue: Property's synthesized getter follows Cocoa naming convention for returning 'owned' objects

I'm currently using the iOS 5 SDK trying to develop my app. I'm trying to make an NSString a property, and then to synthesize it in the .m file (I have done this before with no issues). Now, I came across this: "Semantic Issue: Property's synthesized getter follows Cocoa naming convention for returning 'owned' objects."

This is my code: .h

@interface ViewController : UIViewController {
     NSString *newTitle;
}
@property (strong, nonatomic) NSString *newTitle;

.m

@synthesize newTitle;

Does anyone have a clue how I could fix this? Thanks!!

Will using 'var' affect performance?

Earlier I asked a question about why I see so many examples use the varkeyword and got the answer that while it is only necessary for anonymous types, that it is used nonetheless to make writing code 'quicker'/easier and 'just because'.

Following this link ("C# 3.0 - Var Isn't Objec") I saw that var gets compiled down to the correct type in the IL (you will see it about midway down article).

My question is how much more, if any, IL code does using the var keyword take, and would it be even close to having a measurable level on the performance of the code if it was used everywhere?

How does an underscore in front of a variable in a cocoa objective-c class work?

I've seen in a few iPhone examples that attributes have used an underscore _ in front of the variable. Does anyone know what this means? or how it works?

an interface file I'm using looks like:

@interface MissionCell : UITableViewCell {
    Mission *_mission;
    UILabel *_missionName;
}

@property (nonatomic, retain) UILabel *missionName;

- (Mission *)mission;

I'm not sure exactly what the above does but when I try to set the mission name like:

aMission.missionName = missionName;

I get the error: request for member 'missionName' in something not a structure or union

How to check a not-defined variable in JavaScript

Possible Duplicate:
Detecting an undefined object property in JavaScript

I wanted to check whether the variable is defined or not. For example, the following throws a not-defined error

alert( x );

How can I catch this error?

How to check if type of a variable is string in python?

Is there a way to check if the type of a variable in python is string.. like

isinstance(x,int);

for integer values?

JavaScript check if variable exists (is defined/initialized)

Which method of checking if a variable has been initialized is better/correct? (Assuming the variable could hold anything (string, int, object, function, etc.))

if (elem) { // or !elem

or

if (typeof(elem) !== 'undefined') {

or

if (elem != null) {