Example: Using import/export
Let's create a file named module.js (filename can be anything) with the following content:
// program to include JS file into another JS file
const message = 'hello world';
const number = 10;
function multiplyNumbers(a, b) {
return a * b;
}
// exporting variables and function
export { message, number, multiplyNumbers };
In order to include these variables and functions in another file, say main.js, you can use the import keyword as:
// import the variables and function from module.js
import { message, number, multiplyNumbers } from './modules.js';
console.log(message); // hello world
console.log(number); // 10
console.log(multiplyNumbers(3, 4)); // 12
console.log(multiplyNumbers(5, 8)); // 40
To include another file, you have to export the code that you want to use in another file using the export statement. For example,
export { message, number, multiplyNumbers };
You could also do individual export. For example,
export const message = 'hello world';
export const number = 10;
To include code from another file, you have to use the import statement and import using the file path. For example,
// importing codes from module file
import { message, number, multiplyNumbers } from './modules.js';
Then, you can use these codes as they are a part of the same file.
This helps in writing cleaner, maintainable, and modular code.
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