Category: JavaScript

To properly add 1 month from now to current date in moment.js and JavaScript, we call the add method.

For instance, we write

const d = moment().add(1, "months").calendar();

to call moment to create a moment object with the current date and time.

Then we call add to add 1 month to the date.

And we call calendar to return the date string with the date.

To check if a variable exists with Node Jade Template Engine, we use an if statement.

For instance, we write

if locals.username
  p= username
else
  p No Username!

to check is the locals.username variable exists with if locals.username.

To send a success status to browser from Node.js and Express, we call the sendStatus method.

For instance, we write

res.sendStatus(200)

to call the sendStatus method to send a 200 response code.

To run Node.js app with ES6 features enabled, we set the presets option.

For instance, in package.json, we write

{
  "dependencies": {
    "babel-cli": "^6.0.0",
    "babel-preset-es2015": "^6.0.0"
  },
  "scripts": {
    "start": "babel-node --presets es2015 app.js"
  }
}

to add the babel-preset-es2015 package.

And we set the --presets option when we run babel-node to enable the ES6 features.

To read and write a text file in TypeScript and Node.js, we call the readFileSync function.

For instance, we write

import { readFileSync } from "fs";

const file = readFileSync("./filename.txt", "utf-8");

to call readFileSync to read filename.txt into a Unicode string.