Nodejs dynamic variable name

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Nodejs dynamic variable name

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nodejs dynamic variable name

Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. So I need to take the variable "originalTitle" in "tvseries" or "movie" object, so I need to make this :.

But, how to use the contain of "type" for this? I have try with the javascript method, and the use of "window['type']", but it's don't work in nodeJs.

How to use dynamic variable name in nodejs

Learn more. How to use dynamic variable name in nodejs Ask Question. Asked 4 years, 11 months ago. Active 4 years, 11 months ago.

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Viewed 3k times. I need a dynamic variable in nodejs. I use the allocine-api, and she return, a different object when I use it. For example : allocine. So I need to take the variable "originalTitle" in "tvseries" or "movie" object, so I need to make this : result.

What is result? Where is it defined? Still hard to understand. There is no to level window object available in node.

What are you trying to accomplish? I try to name a variable dynamic, I can have : result. I don't understand what a dynamic variable is. Active Oldest Votes. Robert Moskal Robert Moskal Sign up or log in Sign up using Google. Sign up using Facebook.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Ok, what I want to do to create element upload form every time user click on add new file group, everything is working fine except that plugin that I use for it need special variable for each upload form to trigger upload button.

In JavaScript, an object's properties can be access either by obj. In the global scope, all variables are children of the window property. So you'll be able to do:. However, if you'd like to limit the scope of this variable to a function, you would have to define a parent object and use this in place of window. Also have a look at this: Use dynamic variable names in JavaScript. For this you can use eval.

But eval is evil. You should use an array for things like this. To add to FAngels answer, you may use bracket notation anywhere. This means that in addition to using window['var']you can use this['var']. I don't think eval is evil necessarily - it just gets misused sometimes.

It's job is to take a string and " eval uate" it into JavaScript code MDNso iff you do need to set variables dynamically eval is one method for doing so:. The question is, is it the best method for what you want to achieve? Not sure abote how that could be done in function scope, but global variable could be created like this:. I don't think you can create dynamic variable names in javascript, but you can set object attributes by string.

So if you create your dynamic variables as attributes of an object, you can accomplish your goal. Learn more. Dynamic variables names in javascript Ask Question. Asked 7 years, 5 months ago. Active 4 years, 8 months ago. Viewed 60k times.

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Is it possible? In what situation would you want to do this? I dont know how many items will be in array, they will be dynamically added. Duplicates: stackoverflow. Active Oldest Votes. Connell Connell You can create dynamic variables with eval.

This is elegant and I like it very much.This post is part of a Node. In the previous post we served up some static content. Dynamic content is content that is generated at the time you request the page. To do this, we need to use a templating engine to render our dynamic data to the page.

Each has its own strengths, syntax, logic, and methods of handling data injection. In this tutorial we will be working with a templating engine named Pug, which changed its name from Jade recently after it was learned that Jade was already a registered trademark. Pug has some great features including a clean shorthand for writing HTML markup, templating logic, and the ability to write inline JavaScript.

We are going to install Pug in the same way the we installed Express earlier in this serieswith NPM, so that it saves a reference to the dependency in our package. To do that, run the following in your command line tool:. Next, we need to tell Express where to look for our template files, and what templating engine we are using. + Express - Tutorial - Insert and Get Data with MongoDB

We are going to do this by setting two Express Application Settings, 'views' and 'view engine' by using the app. This method expects two arguments. The first argument is the name of the property we want to update and the second argument is the value. The code to achieve both of these is below:. This code should come after all dependencies and constants have been defined and before the first app.

Pug uses its own special markup syntax. To nest elements, just create a new line and indent the new tagname. There are two ways to interpolate dynamic data within our template. Assuming that text is a variable that represents some text, we can interpolate its value and render it in our template like so:. The first example is preferred if the variable is the only content in a given element.You may unsubscribe at any time using the unsubscribe link in the digest email.

See our privacy policy for more information. Hosts, for example, will set a PORT variable that specifies on which port the server should listen to properly work. Accessing environment variables in Node. When your Node. This code should output all environment variables that this Node. You should see that the value of PORT is undefined on your computer.

Cloud hosts like Heroku or Azure, however, use the PORT variable to tell you on which port your server should listen for the routing to work properly. Therefore, the next time you set up a web server, you should determine the port to listen on by checking PORT first and giving it a default value otherwise:.

nodejs dynamic variable name

The output should be a message saying Server is listening on port Since process. However, keep in mind that this value is only set during the execution of this Node. Overall you should avoid overriding environment variables as much as possible though and rather initialize a config variable as shown in the PORT example. If you develop on multiple different Node.

A great way to achieve project specific configuration is by using. These files allow you to specify a variety of different environment variables and their values.

You will see in a lot of Twilio demo applications. Having an. How do we load the values from this file? The easiest way is by using an npm module called dotenv.

Simply install the module via npm:. This code will automatically load the. It will skip any variables that already have been set. You should not use. Therefore, you might want to wrap your load statement in an if-statement:. With this code we will only load the. Install dotenv in a directory as shown above. Create an dotenv-example. As you can see the value was loaded and defined using dotenv.

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Change your dotenv-example. The script should print that the current value for FOO is undefined. Now execute it with the appropriate flag to require dotenv :. The result is that FOO is now set to bar since the. If you want to learn more about dotenv make sure to check out its documentation.

As a result of these frustrations, I decided to write my own module based on dotenv to fix this problem and make loading environment variables more convenient things.The source for this interactive example is stored in a GitHub repository. Note that in non-standard, pre-ES implementations the configurable attribute was false as well. Functions created with the syntax new Function Variables and methods can infer the name of an anonymous function from its syntactic position new in ECMAScript You can define a function with a name in a function expression :.

Example below contradicts with what is said at the beginning of this section and doesn't work as described. To change it, use Object. When using get and set accessor properties, "get" or "set" will appear in the function name. You can use obj. Warning: The script interpreter will set the built-in Function. Therefore we can't obtain the class name for virtually any class with a static method property name :. With a static name method Foo. Above class definition in ES syntax will behave in Chrome or Firefox similar to the following snippet in ES5 syntax:.

Trying to obtain the class of fooInstance via fooInstance. The built-in definition in the absence of a custom static definition is read-only :. Therefore you may not rely on the built-in Function.

If a Symbol is used a function name and the symbol has a description, the method's name is the description in square brackets. Warning: Be careful when using Function. These tools are often used as part of a JavaScript build pipeline to reduce the size of a program prior to deploying it to production. Such transformations often change a function's name at build-time. In the uncompressed version, the program runs into the truthy-branch and logs "'foo' is an instance of 'Foo'".

Whereas, in the compressed version it behaves differently, and runs into the else-branch. If you rely on Function.

Get the latest and greatest from MDN delivered straight to your inbox. Sign in to enjoy the benefits of an MDN account. Property attributes of Function. The compatibility table on this page is generated from structured data. Last modified: Mar 25,by MDN contributors. Related Topics. Standard built-in objects Function Properties Function. Learn the best of web development Get the latest and greatest from MDN delivered straight to your inbox.

The newsletter is offered in English only at the moment. Sign up now. Sign in with Github Sign in with Google. Chrome Full support Edge Full support Firefox Full support 1. IE No support No. Opera Full support This article is aimed at developers who are at a beginner to intermediate skill level working with Node.

If you have never heard of global variables or worked with them, no need to worry. This article will get you up and running in no time with everything you need to know about global variables. Global variables are very similar, if not identical, to regular variables. Global variables can be initialized with a value, that value can be changed, and they can even be cleared out like a regular variable.

Working with Environment Variables in Node.js

The difference between a regular variable and a global variable comes down to their scope. When you create a variable in a JavaScript file, that variables only exists in the scope that it was declared in. Now what do I mean by this? In the code below, you can see an example of two different variables with different scopes. In the code snippet above, we can see that there are two variables, fileScope and localScope.

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The variable fileScope can be changed or called from anywhere within this file, whereas the localScope variable only exists inside the function doSomething. I'm sure at this point you are wondering what this has to do with global variables. When we talk about global variables, they exist for all of the files in a program meaning they have global scope for the program. The reason this is possible is because JavaScript programs share a global namespace between all of the files in the program.

To put it another way, imagine that your program is a giant file or container that has "imported" all the other JavaScript files. You then declare a variable in this large container file, that variable now has scope throughout the whole program. If you are not sure what a namespace is or you want to find out more about them, check out this article to learn more.

Now that we have a better understanding of what a global variable in Node is, let's talk about how we actually set up and use a global variable. To set up a global variable, we need to create it on the global object. The global object is what gives us the scope of the entire project, rather than just the file module the variable was created in.

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In the code block below, we create a global variable called globalString and we give it a value. Next, we change the value of globalStringand then finally we set it to undefined. What I have not talked about yet is another way that you can make a variable global.

The reason I have excluded this is because it is not a proper way of setting up a variable. If you declare a variable in a file without using the keyword var and then assign a value to it, the global object will set a property for this variable.

This process essentially turns it into a globally accessible variable. I strongly advise against using this method though as it is not the proper way to go about creating globals.Tag: node. So I need to take the variable "originalTitle" in "tvseries" or "movie" object, so I need to make this :.

But, how to use the contain of "type" for this? I have try with the javascript method, and the use of "window['type']", but it's don't work in nodeJs. You can either use socket. You need to change your code in two sides. First side, you will need to listen incoming socket connections on the socketIO object. You need an Express route for your form post that will finish the http request.

The multer middleware will process the file uploads and add them to the request so they are available to a route handler, but you need to have a route for the form post. From the You might want to have a look at Tornado. It is well-documented and features built-in support for WebSockets. If you want to steer clear of the Tornado-framework, there are several Python implementations of Socket.

Good luck! You have to define belongsTo relation in your Invoice model. The client doesn't get to cause arbitrary events to fire on the socket. It is always a message event.

Using the same client, try this server code in your connection handler: socket. Any values passed to webpack.

nodejs dynamic variable name

DefinePlugin as strings are treated as code fragments—that is to say, using new webpack. Redis would probably be fastest, especially if you don't need a durability guarantee - most of the game can be played out using Redis' in-memory datastore, which is probably gonna be faster than writing to any disk in the world.

Perhaps periodically, you can write the "entire game" to disk My solution to this problem was to split the two describe blocks in to 2 separate spec files. I figured this made more sense anyway, as each test had different conditions it needed to meet, and it isn't much hassle to have extra spec files. The error message spells it out for you. Create a separate file called app.


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