Typescript and Javascript global variables

Question

Typescript and Javascript global variables

I am looking to set up a global variable with a default value

const Months = [
{ name: 'January' },
{ name: 'February' },
{ name: 'March' },
{ name: 'April' },
{ name: 'May' },
{ name: 'June' },
{ name: 'July' },
{ name: 'August' },
{ name: 'September' },
{ name: 'October' },
{ name: 'November' },
{ name: 'December' }
];

and I want to be able to access the Months Variable in multiple files without having to declare it again.

In file1.tsx: Months.map(x => x.name);

In file2.tsx: Months.map(x => x.name);

What is the best way to achieve this?

javascript typescript

Answer 1

Answer №1

Avoiding the use of global variables in your code can significantly reduce the occurrence of bugs and enhance the overall clarity of your program.

I am interested in utilizing the Months Variable across multiple files without having to redeclare it each time.

This dilemma is effectively resolved through the concept of JavaScript modules, which involve the utilization of the `export` and `import` keywords:

./constants.ts:

export const months = [
  { name: 'January' },
  { name: 'February' },
  { name: 'March' },
  { name: 'April' },
  { name: 'May' },
  { name: 'June' },
  { name: 'July' },
  { name: 'August' },
  { name: 'September' },
  { name: 'October' },
  { name: 'November' },
  { name: 'December' },
] as const;

./another_module.ts:

import { months } from './constants.js';

console.log(months.map(obj => obj.name)); // ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"]

Answer 2

Avoiding the use of global variables in your code can significantly reduce the occurrence of bugs and enhance the overall clarity of your program.

I am interested in utilizing the Months Variable across multiple files without having to redeclare it each time.

This dilemma is effectively resolved through the concept of JavaScript modules, which involve the utilization of the `export` and `import` keywords:

./constants.ts:

export const months = [
  { name: 'January' },
  { name: 'February' },
  { name: 'March' },
  { name: 'April' },
  { name: 'May' },
  { name: 'June' },
  { name: 'July' },
  { name: 'August' },
  { name: 'September' },
  { name: 'October' },
  { name: 'November' },
  { name: 'December' },
] as const;

./another_module.ts:

import { months } from './constants.js';

console.log(months.map(obj => obj.name)); // ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"]

Answer 3

Answer №2

To implement this functionality, simply insert the following code snippet into your primary file (commonly named app.js):

const colors = [
{ name: 'Red' },
{ name: 'Blue' },
{ name: 'Green' },
{ name: 'Yellow' }
];

Also, remember to update the declarations in typings.d.ts:

declare var Colors: { name: string }[]

Answer 4

To implement this functionality, simply insert the following code snippet into your primary file (commonly named app.js):

const colors = [
{ name: 'Red' },
{ name: 'Blue' },
{ name: 'Green' },
{ name: 'Yellow' }
];

Also, remember to update the declarations in typings.d.ts:

declare var Colors: { name: string }[]

Typescript and Javascript global variables

Answer №1

Answer №2

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