Use string as variable name No, using string as variable name is not possible in C#. Sep 25, 2023 · Example 2: Using globals () and locals () Here, we utilize the globals () function to create a global variable with a name defined by the string variable_name. Learn more about bash use variable in string and be more productive in bash scripting. Jul 21, 2015 · Hi all, There is a question that maybe someone could help us with. How can I convert string values into python variables? The setup is the following: I have variable_names = ['a', 'b', 'c'] and I would like to create for each item in variable_name a variable which I can assign a value to (like this a = 10, b = 20, c = 30). This also lets you handle duplicates and lookups cleanly. Apr 10, 2024 · Use a formatted string literal to create a file name using variables, e. Unlike C-style character arrays (char []), std::string handles memory management automatically and provides a wide range of built-in functions for ease of use. I can do: mtcars %>% filter(cyl == 4) In my work, I need to pass a string variable as my co Aug 25, 2013 · I already read How to get a function name as a string?. symbol()), and unquote it using !! Simulating OP's data we can do : Explore whether it's possible to use a string as a variable name in Java, including key concepts and best practices. format() call instead. If you have variable of different types, solution exists, as in boost::variant Oct 13, 2019 · I have a variable that has a pin number assigned to it . Jul 23, 2025 · In this article we will discuss how to convert a character string to the variable name in the R programming language i. Jul 23, 2025 · Example: In this example, we define a function greet that logs a greeting to the console, and a variable functionName with the value "greet", which is the name of the function. , from user input, configuration files, or API responses)? Apr 15, 2025 · Using a string value to access a variable with that name Converting a string representation to a different data type (like integers or floats) Let’s explore both approaches with clear examples. You assign a value for each name in the keyword arguments of the str. Assign String to a Variable Assigning a string to a variable is done with the variable name followed by an equal sign and the string: Nov 20, 2023 · Using a string variable as a variable name in an Learn more about string, variable, eqn, cell array MATLAB May 2, 2017 · I have a dataset like this: string_var | var1 | var2 | var3 var2 | 8 | 8 | 4 var3 | 7 | 5 | 7 var2 | 10 | 10 | 5 I need to test whether var1 is equal to either var2 or var3, depending on the string that is contained in string_var. May 24, 2021 · String Manipulation is defined as performing several operations on a string resulting change in its contents. In other words, if I have a Home statistics Learn How to Use String Variables as Column Names in dplyr . However, this problem has been handled in many ways for example, static properties of objects, eval (), and modern ways such as Map can be used to achieve the essential effect of dynamic variable creation, such methods are appropriate for managing dynamic variables Jun 9, 2023 · Convert String to Variable Name in Python will help you improve your python skills with easy to follow examples and tutorials. Formatted string literals enable us to include expressions and variables inside of a string by prefixing the string with f. Here are different ways to use dynamic variables in JavaScript. Have you tried quoting it? Always double quote your variables. Later in the program I will receive that variable's name as a string. Jun 9, 2010 · I'm trying to use a string as a variable name but I don't know how. The idiomatic way now would be to convert to a symbol the string that the variable contains, using sym() (which is almost the same as base aliases as. Can automatically grow and shrink as you add or remove characters, unlike fixed-size C-style strings. Unfortunately the method differs between ksh, bash and zsh. This replaces aes_ () and aes_string () which are now soft-deprecated (but will remain around for a long time). Format("{Name} from {Address. Apr 12, 2012 · How can I convert it into a variable? It might not make sense to define a string with a variable and try to convert it to the variable itself but it will be helpful in my code. Then we use eval () method to execute the function by constructing a string of code that calls the function by name, passing in the argument "Alice". This function takes an argument and returns its string representation. Using the str() Function The most straightforward way to convert a variable name to a string in Python 3 is by using the built-in str() function. For example, if x = "Python", we can loop through globals () or locals () and compare values using the is operator to find that the name x points to "Python". Aug 5, 2025 · In JavaScript, if we consider the variable names as string values, it is difficult to transform a variable’s name into a string. Learn more about char, variable, bad idea, anti-pattern, antipattern, slow, inefficient Jan 3, 2013 · Hi, Is it possible to use a string as a variable name to which I can assign values??? Trying to explain the problem below in a better way: Let's assume we have a variable X = 'omega' How to use a character string as variable name - 2 R programming example codes - Converting characters into data objects - Turn string into variable original_string <- "variable_name=variable_value" First, I extract the variable name and value from the original string and convert the value to numeric class. Start variables with lower case, start classes with uppercase. But the latter gives me the error: Nov 10, 2019 · Each struct has the same underlying structure and variable names. I want to generate a structure based on the string of variable *name *and then create fields in this structure. (sprintf('x%d', i)) = i; Jul 23, 2025 · In this article, we will see how to call a function of a module by using its name (a string) in Python. Example of lazy creation and normalization to avoid duplicate keys like "Bob" vs "bob ": This MATLAB function constructs a string or character vector varname that is similar to or the same as the str input, and can be used as a valid variable name. Nov 7, 2024 · 1. 2 days ago · How to Dynamically Convert a String to a Variable Name in Python: Step-by-Step Guide In Python, variable names are typically defined explicitly by the developer. May 17, 2010 · In other words… I need to build a variable name from a string and integer value… then I need to evaluate that actual variable. You can easily Your variable can be overwritten by function argument names, for loop variables, and simply by assigning a new value to that variable. Identifiers are fixed at compile time. Thus, suppose you have a list of strings that you would like to turn into variable names for integers. data pronoun, Data Manipulation, dplyr, FILTER function, get () function, non-standard evaluation, programmatic column selection, R functions, R programming, R tips, string variable, string variable column name, tidyverse May 9, 2019 · So basically you type in the string “QuestKillKing” for the variable ‘ActiveQuest’ on the dialogue script and it would then use that string to reference the QuestKillKing variable in the quests script. 1. But the name of each struct is different, yet predicable by the filename I want to programatically load the files (no problem), create a string from information in the filename (no problem), and then use this string as the structname. City}, {Address. I would like to mutate a existing column based on string input: var <- 'vs' my_mtcars <- m Aug 23, 2021 · I started reading on converting strings to variable names and found the deprecated function genvarname (), which points to matlab. When I print(a) I should get 10. The idiomatic way is to index your Player objects by name in a map and add them dynamically as you parse the file. Dec 8, 2011 · Use string as variable name in BASH script Asked 13 years, 10 months ago Modified 13 years, 10 months ago Viewed 15k times use Btn or Button in the end of the name of variables reffering to buttons, str for strings and so on. Does that make more sense? I really need a working answer with some sample code please if you can help. Sep 15, 2016 · Use strings in a list as variable names in Python Asked 9 years, 1 month ago Modified 7 years, 10 months ago Viewed 22k times Nov 6, 2024 · Explore effective ways to dynamically access variable values using their names in Python with practical examples. Jan 24, 2014 · is it possible in C# to use a String like a variable name ? I have got a: I want to instantiate a new List , and name it according to a variable value. May 6, 2025 · What Is a String Variable? Meaning, Examples, and Use in Data Analysis In research and data analysis, especially when using statistical software like SPSS, R, or Python, understanding the different types of variables is essential. I need to know how to use variable with name specified in string. My problem is how how can I use tha string as the variable name. By passing the variable name as the argument, you can obtain its string representation. I want to know how I can access a named variable within my program using this string. String variables are used to store and manipulate textual data, making them essential for handling user input, processing text, and interacting with databases. Feb 21, 2017 · How can I convert a string to variable name an assign some value to this variable? In R I use assign() function for this, but I was not able to find its equivalent in Julia. I declared x as a private double Private TextBox1Store,TextBox2Store,TextBox3Store As Double I will use that as a variables Oct 23, 2015 · For simplicity this is a stripped down version of what I want to do: def foo(a): # I want to print the value of the variable # the name of which is contained in a I know how to do this in Home statistics Learn How to Use String Variables as Column Names in dplyr . Convert String to Variable Name Using globals() and locals() in Python Using globals() to Convert String Into a Variable In Python, dynamic programming can extend to the creation of variable names from strings. Python has powerful tools and data structures, use them instead. Nov 6, 2024 · Explore effective methods to dynamically convert strings to variable names in Python using dictionaries. Apr 4, 2013 · Using string as variable name Asked 15 years, 10 months ago Modified 12 years, 1 month ago Viewed 5k times Dec 4, 2024 · This article will serve as a comprehensive guide on how to come up with meaningful names for class names, variables, and functions with examples and best practices. This variable can be accessed throughout the program using the same string as its name. In Shell Scripting, this can be done in two ways: pure bash string manipulation, and string manipulation via external commands. name() / as. e. But what if you need to create variable names dynamically —for example, when variable names are determined at runtime (e. Feb 1, 2018 · I want to declare a variable, the name of which comes from the value of another variable, and I wrote the following piece of code: Also note that a variable is just a reference to an object; it is not "the name of the object" (there might actually be many variables that reference the same object). May 8, 2021 · I can't figure out how to concat a string to a variable to use in a query. Sep 20, 2025 · Strings in C++ are objects of the std::string class. post that contains a variable named, I want to do something like: somefunction(" Jun 9, 2016 · With more emphasis: you do not use a string value as a variable name in python. Feb 26, 2014 · I really discourage you from using eval to pop incremental variables in your workspace. Jun 17, 2013 · Inside a function I have a variable called name which is a char class. Feb 12, 2024 · Note: It is possible to convert a string value into a variable, but please be cautious while doing this. If you want a name create a structure: s. In this example, we will have a variable named by us and an input string. I trying to supply key and value from xml file. The contents of a string are a run-time concept (string literals are slightly different, but those won't work either). Here goes with some example data. Dec 27, 2016 · Remember that the name of a variable is nothing but a name — a way for you to refer to the variable later. Jan 31, 2013 · f = open('%s. In this blog post, we will dive deep into string variables, exploring their definition, declaration, manipulation, and use cases in various Nov 21, 2022 · This tutorial explains how to pass a string as a variable name in dplyr, including an example. Introduction Understanding string variables is crucial in programming and web development. Rules for Python variables: A variable name must start with a letter or the underscore character A variable name cannot start with a number A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ ) Variable names are case-sensitive (age, Age Dec 24, 2023 · String is a powerful type of variable in Bash. You can insert data into it by specifying Now, by using globals() or locals() function, we can change the string into a variable name and assign a value to it. csv', 'ab') %name TypeError: unsupported operand type(s) for %: 'file' and 'str' it works if I use a static filename, is there an issue with the open function, that means you can't pass a string like this? name is a string and has values such as : Apr 1, 2012 · You can use an associative container as a std::map< std::string, your_variable_type > to link a string to a variable, assuming they are all of the same type. like 'buffalo', x='buffalo' I want to convert this string to some variable name like, buffalo=4 not only this example, I want to convert any input string to some variable name Jul 1, 2025 · Getting a variable name as a string in Python means finding the label that points to a specific value. Basics of pure bash string manipulation: 1. For example, using eval with sprintf allows for the assignment of values to a variable whose name is defined as a string. They are used to represent and manipulate sequences of characters. It would be enough if I can call the variable using something similar to: Dec 31, 2023 · Javascript converts string data value to a variable in javascript using eval function and window scope object. Jun 20, 2012 · I am reading the name of a string variable from the database (e. We will then apply the exec () method with some modifiers and try to convert a string into a variable name. I have class (Customer) which holds more than 200 string variables as property. makeValidName () that takes string as the argument. I do not want a dictionary. then there is no weirdness with non standard evaluation. Just wondering if anyone had any advice on doing this. g. we are going to assign the character string to the variable as the variable name Method 1: Using assign () function We can assign character string to variable name by using assign () function. Jan 11, 2020 · I have been reading from this SO post on how to work with string references to variables in dplyr. For example, str declared as a string and gets the value of "number" and I wanted to use the value of the str to be the variable name of an integer type. In Python, these function returns a dictionary containing the variables defined in the global or the local namespace. This feature simplifies the process of string interpolation and enhances code readability. Reference General reference Object identifiers Literals and variables as identifiers Literals and variables as identifiers with IDENTIFIER () syntax In Snowflake SQL statements, in addition to referring to objects by name (see Identifier requirements), you can also use a string literal, session variable, bind variable, or Snowflake Scripting variable to refer to an object. Mar 12, 2013 · Is it possible to use a string as a name of a variable? For Example. Is it possible to convert a string to a SAS variable name at datastep execution time? We mean, for example, during execution of datastep being able of doing something like this: VAR2=str_to_varname("VAR1"); /* using the value Is there a way to get a variable name as a string in Javascript? (like NSStringFromSelector in Cocoa) I would like to do like this: Aug 2, 2024 · We then store the string "greet" in the variable func_name. The global object `window` (in browsers) allows you to use strings to reference variable names. Mar 31, 2021 · 1. Apr 21, 2016 · Smart. Bash uses the value of the variable formed from the rest of parameter as the name of the variable; this variable is then expanded and that value is used in the rest of the substitution, rather than the value of parameter itself. Jan 13, 2018 · How to convert string to variable name ?. In JavaScript, you cannot directly use a string as a variable name in the traditional sense, but you can access variables dynamically using object property access. Using exec () Method in Python to Convert a Python string to a Variable Name The Exec () methods helps us to execute the Python program dynamically. . I'm using method with parameter of key and value. I have any string. Read How to Print Strings and Variables in Python? Method 1: Use the eval () Function The eval() function evaluates a string as a Python expression. String formatting placeholders that use names (such as {element}) are not variables. Nov 6, 2024 · Learn effective methods for using string variables as variable names in Python programming, including practical examples and alternative approaches. data pronoun, Data Manipulation, dplyr, FILTER function, get () function, non-standard evaluation, programmatic column selection, R functions, R programming, R tips, string variable, string variable column name, tidyverse Jul 12, 2025 · Dynamic variable names are variable names that are not predefined but are generated dynamically during the execution of a program. Assigning content to a variable and printing its content: In bash, ' $ ' followed by the variable name is used to . Aug 6, 2008 · How do I call a function, using a string with the function's name? For example: Using a string as a variable name is only really useful if you don't have the string until runtimebut the compiled program doesn't know about variable names; it knows about memory addresses and offsets. int led = 1; String light; void setup(){ pinMode(led ,OUTPUT); } void loop(){ //this is the strong that I will receive light = led; digitalWrite(light, HIGH); //for sure this function won't work because Oct 13, 2021 · Closed 4 years ago. lang. State}", user) // The user object should at least be like that public class User { public string Name { get; set; } public Address Address { get; set; } } public class Address { public string City { get; set; } public string State { get; set; } } It is available on NuGet and has excellent documentation. Nov 17, 2008 · How do I convert a string to the variable name in Python? For example, if the program contains a object named self. For example int i=2; string listname="name"+i. To overcome this, I suggest using an Object to store all relevant data to your application (Static And/Or OOP). I tried a using dynamic sql but kept getting errors because I don't know what I'm doing. Short answer: you cannot create Java variable identifiers from data at runtime. Oct 17, 2008 · To use a string variable as a variable name in MATLAB, the eval function can be employed to dynamically create variables based on string inputs. std::unordered_map provides the same behavior that a dictionary provides in some other languages. Feb 7, 2018 · I want to use this to call a method on several variables that have similar, but not identical names without using a switch-statement. I'm accustomed to working in autohotkey where I can make variables out strings very easily. Dec 20, 2024 · Using f-string with a Variable in Python 3 Python 3 introduced a powerful string formatting technique called f-strings, which provide a concise and efficient way to embed variables within strings. Can you show me another example of how to use this to create a variable from a joined string and then assign it a value? How can I make the code that follows to work? var x = 'name'; and then, to use the value inside x, as it was a variable, and set it, so that if i want it to be NAME, i'll have the result: var na Is there any way to use string stored in variable as a column name in a new data frame? The expected result should be: Declaring (Creating) Variables To create a variable in Java, you need to: Choose a type (like int or String) Give the variable a name (like x, age, or name) Optionally assign it a value using = Here's the basic syntax: If you are not using dplyr, you can use string arguments to index the dataframe by just using df [ [name1]]. txt'. One of the foundational variable types is the string variable. f'{variable}. For example (getting data in the matrix 'age'): Dec 27, 2011 · Variable names are a compile-time construct. Jul 19, 2012 · I have a variable with a string assigned to it and I want to define a new variable based on that string. For example, you can Apr 15, 2019 · Here, we are utilizing a method that takes the name of the variable and the value to change it to - then passing it to the current vue model instance (represented by this inside of methods) to modify the value of the dynamic variable name. This means the name of a variable can be determined at runtime, rather than being explicitly written in the code. But there is certainly a way to achieve whatever you wanted, it's just still not clear to me what exactly is your goal in a bigger scope. My problem is to convert these strings into variable names to do something like: gen test=1 if var1==string_var where, after the ==, I need some kind of conversion Modern advanced shells have a method to reference the value of a variable whose name is stored in another variable. Variable Names A variable can have a short name (like x and y) or a more descriptive name (age, carname, total_volume). Basically, we use a function of any module as a string, let's say, we want to use randint () function of a random module, which takes 2 parameters [Start, End] and generates a random value between start (inclusive) and end (inclusive). May 18, 2021 · I already have variables and I want to avoid making another array from variables, here you write x=magic or random, but in my program I first will need to make that array from my varibles which have different names for each subject and different days. ToString (); List<int> listname; how can i use the listname's value as a variable name for new List? is that possible? Edit: What i am trying to do: I have a dictionary and have value for each key in the new scenario each key may have more than one value so i am trying to Dec 26, 2011 · For example if you create a dog in a variable named Fido, and then assign it to a new variable named spot, both variables, despite having different names will refer to the very same object: Jan 12, 2018 · I'm using mtcars dataset to illustrate my question. How can I do the same for a variable? As opposed to functions, Python variables do not have the __name__ attribute. Jan 30, 2012 · Related: Strings as variable references in R Possibly related: Concatenate expressions to subset a dataframe I've simplified the question per the comment request. This method works well for cases when the column name is stored in a variable. Aug 3, 2015 · Essentially, strings are just ASCII characters, and C file containing variable names can be thought of in the same way. For example, I want to subset data to 4-cyl cars. "_datafile"). In C++ it is not possible nor useful to postpone assigning the name of the variable at runtime. For this, value has Jul 23, 2025 · Method 1: Specify Column Name Dynamically Using aes_string() The aes_string() function lets you specify column names as strings. By passing func_name to eval(), we get a reference to the greet() function, which we can then call with the argument "Alice". JavaScript eval () Method The eval () function in JavaScript evaluates a string as Apr 7, 2014 · Local variable names exist only during compile-time and the values you are trying to use do not exist at compile-time at all since the program has not executed yet. vmztih iimt snymjl toyyg tucv aiktyx jkdy phhko yjtbata amdq chin tntkzz smmypj qaolkj jpjubi