Use one javascript variable into another javascript file

1. How do I pass a variable from one JavaScript file to another?
2. How do I run a JavaScript file from another JS file?
3. How do you import a variable in JavaScript?
4. How is a variable accessed from another file?
5. How do you use a variable declared in one file and can be used in other file?
6. Should I have multiple JavaScript files?
7. How do you read a file in JavaScript?
8. How do you link a file in JavaScript?
9. What does import do in JavaScript?
10. What is import and export in JavaScript?
11. What are JavaScript modules?

How do I pass a variable from one JavaScript file to another?

In JavaScript, variables can be accessed from another file using the <script> tags or the import or export statement. The script tag is mainly used when we want to access variable of a JavaScript file in an HTML file. This works well for client-side scripting as well as for server-side scripting.

How do I run a JavaScript file from another JS file?

Answer: Use the export and import Statement

Since ECMAScript 6 (or ES6) you can use the export or import statement in a JavaScript file to export or import variables, functions, classes or any other entity to/from other JS files.

How do you import a variable in JavaScript?

1. Importing named exports: import x [as y], ... from "module"
2. Importing the default export: import x from "module" import default as x from "module"
3. Import all: import * as obj from "module"
4. Import the module (its code runs), but do not assign any of its exports to variables: import "module"

How is a variable accessed from another file?

It is possible to create a global variable in one file and access it from another file. In order to do this, the variable must be declared in both files, but the keyword extern must precede the "second" declaration. A static variable can be either a global or local variable.

How do you use a variable declared in one file and can be used in other file?

It is possible to create a global variable in one file and access it from another file. In order to do this, the variable must be declared in both files, but the keyword extern must precede the "second" declaration. global static variable is one that can only be accessed in the file where it is created.

Should I have multiple JavaScript files?

To avoid multiple server requests, group your JavaScript files into one. Whatever you use for performance, try to minify JavaScript to improve the load time of the web page. If you are using single page application, then group all the scripts in a single file.

How do you read a file in JavaScript?

Read a file's content #

To read a file, use FileReader , which enables you to read the content of a File object into memory. You can instruct FileReader to read a file as an array buffer, a data URL, or text. // Check if the file is an image.

How do you link a file in JavaScript?

If you want to run the same JavaScript on several pages in a web site, you should create an external JavaScript file, instead of writing the same script over and over again. Save the script file with a . js extension, and then refer to it using the src attribute in the <script> tag.

What does import do in JavaScript?

Import an entire module's contents

This inserts myModule into the current scope, containing all the exports from the module in the file located in /modules/my-module. js .

What is import and export in JavaScript?

In JavaScript ES6, you can import and export functionalities from modules. These can be functions, classes, components, constants, essentially anything you can assign to a JavaScript variable. ... The import and export statements in JavaScript help you to share code across multiple files.

What are JavaScript modules?

JS modules (also known as “ES modules” or “ECMAScript modules”) are a major new feature, or rather a collection of new features. You may have used a userland JavaScript module system in the past. Maybe you used CommonJS like in Node. js, or maybe AMD, or maybe something else.