Node js dynamic variable name. Mar 4, 2021 · Node.

Node js dynamic variable name. // function for handling a dynamic list of variables using REST parameters. ” For example, if we want to define any string property on obj: type obj = { [key: string]: string } Note that the syntax is similar to how we’d use a variable object property in standard JavaScript: const variable = "name" const obj = { [variable]: "Freecodecamp" } Use an object. 17. You can read more about why here: Define const variable using eval(). The name of the class will be related to the variable - eg. R's comment above, I was able to set a js object property name from a variable in Google Apps Script (which does not support ES6 yet) by defining the object then defining another key/value outside of the object: Are you looking for a code example or an answer to a question «node js dynamic variable name»? Examples from various sources (github,stackoverflow, and others). Every Tom, Dick, and Harry uses the array-style, which is fine. Email. log('Item4 = ' + item4); Output: "Item1 = 1" Apr 19, 2024 · However, when working with loops, it's crucial to understand how to effectively name and manage dynamic variables. Apr 16, 2023 · Node. Mar 21, 2023 · The dynamic import is supported by both Node. replace also accepts strings as input, so you can do "fox". Required, but never shown Post Your node. js file and here is the related code: const environment = {} Dec 18, 2015 · Dynamic node. Here's what I tried: var User = {}; User. js, the keys as the parameter names and the If value is a variable and you want a dynamic regular expression then you can't use this notation; use the alternative notation. Until you're working with arrays and dynamic variables, oh boy! Eye-bleed overload. This way, you can always "hijack" your env variables, for testing, for example. It's Sep 7, 2017 · you can't use parameters to specify a table name in SQL Server (or most other DBMSs). In this tutorial, I am going to show you how to create a dynamic variable and then how to use it in JavaScript. A script would call the function find() in the object User if the function exists. Example: May 21, 2024 · These conventions encompass variable names, function names, constants, file names, and more. We will look at a couple of ways to use dynamic variable names in JavaScript. What I want is to dynamically pass the partial that I want to render (basically I want the first Jul 31, 2017 · How can i pass table name as variable. parameters in a URL in Node. Oct 12, 2014 · I want to dynamically call a function from a string like "User. It is possible to create a dynamic variable in JavaScript and then using it for a specific task. passing 'Two' will create ClassTwo. How to declare/call here. It is a static object that is created when the module is evaluated. May 4, 2017 · As epascarello points out, you usually don't need "window" - "dyn_functions['populate_Colours'](arg1,arg2);" will work. Example: Oct 1, 2024 · However, we can also substitute the name property for a “variable type. The reason is that the variable object of the global object is the window object itself. log('Item1 = ' + item1); . We can’t access the Activation Object in the function’s Context . A simple function then allows us to pick up the dynamic variables Node: function getEnvVar(key, Hi, my name is Yasir, and I’m a full-stack developer with Very clear and practical answers. I want to import some module at a runtime depending on values provided in a config: import something from '. replace("fox", "bear"); Jun 6, 2017 · I am trying to dynamically assign variable names using the user's input. js app, the challenge is that when a function is executed, it is self aware of the country so, we can (and must) use the "current" country and the current country_iso_code ("fr" for example), and with this we must use the pricing that match this country. rename("newName") etc. Let's say I have an object named myobject. But I'm facing a weird problem. NEXT_PUBLIC_CURRENCY_ES=Euros NEXT_PUBLIC_CURRENCY_MX=Pesos NEXT_PUBLIC_CURRENCY_GB=Pounds CURRENCY_ES=Euros CURRENCY_MX=Pesos CURRENCY_GB=Pounds Feb 25, 2022 · by using module. defineProperty(data, key, withValue(value)); where data is your object, key is the variable to store the key name and value is the variable to store the value. Dec 22, 2020 · I have a webapp in Nextjs both in server and client mode, access to process. Aug 5, 2015 · I'm using nodejs-mysql module to do query in node. When you try to access an object's property, you need to use a type keyof. Create a config JS file which collects all env variables and exports a config Object which you can pass to your application. You can set dynamic properties on an object no problem. One of the most common ways of using dynamic variable names is via eval function, which evaluates any expression and returns its result. console. Jul 27, 2019 · Dynamic variable and content ejs. So let’s continue following this tutorial. I needed to call them using another variable that held a string with the name of one of these variables like this: var c = 'a'; // holds the name of the wanted content, but can also be 'b' or 'c' $('someSelector'). In fact not including the global object's name will make code more portable if you are writing routines that might ever be used in a JS environment other than a web browser. . js recently, and in my working case I could only use the parameter-binding syntax like:. html(count); Var dynamicVariable = 'Person'+'Count A dynamic variable name is auto-generated while running the program. Whatever programming problem you are trying to solve can likely be solved in a much better way since you really shouldn't be introducing dynamically named local variables. In this blog post, we'll explore best practices for naming dynamic variables in loops, with a focus on readability, performance, and maintainability. Oct 1, 2020 · First of all, one thing to note, if you want to use env variables on the client then you need to prefix them with NEXT_PUBLIC_, or use the older way of exposing them to the client inside next. I create a env. const dynamicVars = (theArgs) => {. I was getting weird undefined values in from index 0 - 20 when I tried to set a new value at the index 21 on a new array. Feb 2, 2024 · Use eval() to Create Dynamic Variable Name in JavaScript. js, camelCase is the most widely adopted convention for naming variables and functions. env file. I want to fill a variable with this name and use the variable to access the object. Basically i want to make e function in which i will take table name as a parameter and object insert record in mysql database in using nodejs My function will Feb 8, 2020 · That’s because import/export aim to provide a backbone for the code structure. There are many ways to implement dynamic express routes. e. /file. exports = var; and const var = require(". Just basing this off of the syntax, but if the set method takes in two strings, or a string and some other value, then there shouldn't be any reason you couldn't pass a variable as the first parameter, The called really doesn't know if the caller gave it a static string or a variable. const obj = {}; const dynamicName = "abcd"; obj[dynamicName] = 5; But in your case, it sounds like you want an array if your variable names are just a series of numbers. That’s a good thing, as code structure can be analyzed, modules can be gathered and bundled into one file by special tools, unused exports can be removed (“tree-shaken”). In our node. Is there something like this in I am able to call function in my code. May 21, 2011 · I want to use the value of a variable to access an object. 2 and above) and most modern browsers. Dec 5, 2017 · This is my Code: function NewPerson() { var count = parseInt($('#HiddenField'). Modified 3 years, 8 months ago. html(eval(c)) // this will just use the content of var c defined above Just use eval to get the variable data. Viewed 2k times 0 I'd like to run an SVG-PDF Sep 9, 2018 · For just keeping an indicator/flag for a seen video, you could use Set or if you need more stored information, take a Map instead of using dynamically created variables where you still need to create an accessor for the variable as well. js variables that point to objects. I have tried many ways of Aug 27, 2012 · Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand Jun 18, 2020 · "OK" is a string, and str is implicitly taking the type string in your code. Asking for help, clarification, or responding to other answers. log('Item2 = ' + item2); . How to Use Dynamic Variable Names in JavaScript. TypeScript then knows you are not assigning a random string; you are assigning strings compatible with the properties (keys) for the object. JavaScript Code: var j = 'item'; var i = 0; for (i = 1; i < 5; i++) { eval('var ' + j + i + '= ' + i + ';'); } . Below are some key naming conventions in Node. Sep 26, 2012 · One possible solution may be: Using REST parameter, one can create an array and add each dynamic variable (REST parameter item) as an object to that array. Aug 9, 2015 · The below code working fine but routes / and /signup will show same thing (except title) because the first argument in the res. I don't want to just use a switch clause like this: In regards to iterative variable names, I like making dynamic variables using Template literals. Sep 27, 2017 · I'm trying to dynamically create node. Provide details and share your research! But avoid …. Aug 19, 2024 · A module namespace object is an object that describes all exports from a module. LOCATIONS_HOST or process. Consistency is key in coding. ArrayTop[] ArrayLeft[] ArrayRight[] ArrayWidth[] I am trying to set the name dynamically in a function and then set value. For example: var input = document. js; mongodb; mongoose; How to pass variable name as collection name for mongo db in nodejs. This involves using an object (like window or an ordinary object) and assigning a value to a property using a string as the key. Dec 22, 2019 · You should only read your environment variables from one place in your application. Ask Question Asked 3 years, 8 months ago. } The variables can now be referenced as row1, row2, etc dynamically. however I want to make my calling function name as variable so that it can call any function based on my variable value . Jun 18, 2015 · Along the lines of Sainath S. The only way to vary it is through string concatenation of the variable into your SQL. js: Variables and Functions in camelCase. length; i++) { let name = ‘row‘ + i; window[name] = rows[i]; . Oct 27, 2017 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. There are two ways to access the module namespace object of a module: through a namespace import (import * as name from moduleName), or through the fulfillment value of a dynamic import. org Feb 3, 2024 · Node. What other interesting use cases of the dynamic import do you know? Share your idea in a comment below! Feb 2, 2024 · The technique above to create dynamic variable names works for Global Object only. Share Improve this answer May 27, 2019 · Table names and column names cannot be parameterized for similar reasons that you can't parameterize a variable name in a programming language; they're part of the fixed structure of a program. In maven . SELECT * FROM table WHERE name May 30, 2021 · You can not specify a module name that is constructed dynamically with the standard import syntax because of the static nature of the ESM module system - the dependency graph is actually built ahead of actual code execution, at which point the module names should be known. js; ejs; or ask your own question. I know I can create a variable dynamically in scope using eval: var vars = ['a','b'] for(var n=0; n&lt;vars. html()); count++; $('#HiddenField'). let tempDynamicVars = []; See full list on geeksforgeeks. Aug 20, 2018 · To use dynmamic variables, keep the variableNames in an Object, whenever you create the variable name dynamically, refer the object to get the variable's value. /utils/' + variableName; Note that I’m using Node. accounts()['catType']() so here I want to make catType as variable, so that I can pass any value. It depends to a great extent on the structure you have implemented in your project, here I leave an example of dynamic routes and I hope it will be useful. js, but answers must take compatibility with ECMAScript modules into consideration. render doesn't do anything and because in the layout I have {{< index}} which render the view with the name index. json. find". In Node. node. env like this always returns me "undefined":. name } Thanks! Apr 30, 2017 · There is a feature from maven I miss a lot in package. Name. ipID = { name : value, anotherName : anotherValue } Oct 31, 2018 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Jan 7, 2016 · Depending on the value of the variable, a different class will be created. find() db[colName]. var name; var value; var temp = {}; tmp[name] = value My question is, how can I add these name value pairs/ tmp to my ipID objects so that my outcome turns out like. config. js and I have an abstract base class with a class factory where I pass the class type I want in as a parameter, which itself comes from the environment. Here’s how you could handle dynamic variable names in a Node. Even more. Feb 1, 2021 · How to create dynamic object names in NodeJs [duplicate] Ask Question Asked 3 years, Add a property to a JavaScript object using a variable as the name? 980. This isn't specific to nodeJS. When working server-side, you might need to dynamically create variables based on request data, configurations, or environment variables. Sep 2, 2019 · But, alas you can't do this with const. Mar 4, 2021 · Node. String. js JavaScript Class Based Dynamic Function Name. Hope this helps! you can use the variable as an iterating variable identifier, in the spot that I suggested; I used this method to build DOM nodes, to create a dynamically built HTML table. I hope this helps! Jun 11, 2013 · I'd like to clarify that if you're trying to make a query concerning a nested field only (not its value), like if you want to query the field "name" from this document: I have a few arrays with like names. js (version 13. Is it possible to import something into a module providing a variable name while using ES6 import? I. js. If table and column names were allowed to be parameterized then several optimisations that are possible to make when you know the structure of input and Aug 26, 2019 · So I'm trying to think of a solution to select specific npm's env variables for instance: process. log('Item3 = ' + item3); . js configurations. SOME_OTHER_API_HOST Then I can write a function to get that like getSpecificHost(name) { return process. js module: Nov 4, 2023 · Dynamic variables allow you to programmatically generate the names: for (let i = 0; i < rows. reportPage. Function / method name is useful as it's inferred from variable and properties now. Example - I have 2 classes, ClassOne, ClassTwo. env. if your key is also dynamic you can define using the Object class with: Object. length;i++ . querySelector('input'); for(var i = 0; i < 10; i++){ var newVariableName = //input Use the function to get the model dynamically. js"); we can access a variable from another file but the imported variable is static and cannot change even if the original variable changes in the original file, how can I export an array that can be updated at any time and accessible in real time in another file? Aug 1, 2022 · In this article, we will learn how to use dynamic variable names in JavaScript. File: Schema. length; n++) When I am sending variable dynamically then it's not retrieving value of a variable. I just did Jul 28, 2015 · I have variable: var variableDynamic = 1; // or var variableDynamic = 1 + i++; Is there any way to use that to create dynamic variable names, for example something like this: var variableNam I then need to add dynamic/variable name value pairs to each ip so I am using code like this. pom file you can define variables in parent project and use them in child project's pom files. This will help you keep your collection name dynamic and can even update it keeping your commands same. Jul 14, 2020 · Is there a simple way to instantiate an object when the class name you want to instantiate is in a variable? I'm porting an existing app to TS/Node. var colName = "mytest" and then execute all the operations on collections as below: db[colName]. In JavaScript, you can create dynamic variable names using bracket notation. js isn’t left out of the dynamic variable party. Apr 9, 2021 · I create a NodeJS server and trying to setup environment variables dynamically. js - How to write variable file names. Sep 6, 2016 · You can create variable using var for collection name. I want to be able to pass a variable to a function and get a new class back. Sep 16, 2008 · var myPanels=new Array("Email","News","Finance"); // object, often used like associative array var div = {}; // array var dynamic = []; for (i=0;i<myPanels. qdkye pbcqr qyssbb vbbxemsl tpfni eadba ijjx vcinbffd txdee aiqr