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Learn how to obtain an array containing all the methods of a JavaScript object. To accomplish this, we can utilize the Object.getOwnPropertyNames() function. This function allows us to retrieve all the property names associated with an object. Once we have the resulting array, we can filter it to only include property names that represent functions. To determine if a property is a function, we can use the typeof operator. Here’s an example of how we can create a utility function to achieve our goal:...

How to List All Users in PostgreSQL Discover how to retrieve a comprehensive list of all users existing in a PostgreSQL database, along with their permissions. To achieve this, follow these steps: Open the psql interface. Execute the \du command. Upon executing the command, you will receive a detailed overview of all users in the system. This includes their role attributes and the associated role groups they belong to. Image: List all users in PostgreSQL...

Listing files and folders in a directory is a common task in Python programming. In this tutorial, we will explore different methods to accomplish this. Using the os.listdir() Method The built-in os module in Python provides the listdir() method, which can be used to retrieve a list of files and folders in a given directory. Here’s an example: import os dirname = '/users/Flavio/dev' files = os.listdir(dirname) print(files) In the above code, we import the os module and set the dirname variable to the desired directory path....

In PostgreSQL, there are multiple ways to list tables in the current database. In this article, we will explore two methods: using the psql tool and running an SQL query. Method 1: Using psql To list the tables in the current database using the psql tool, follow these steps: Open the psql tool in your terminal or command prompt. Connect to your PostgreSQL database by running the following command: psql -U username -d database_name Replace username with your PostgreSQL username and database_name with the name of your database....

In modern JavaScript web development workflows, it’s common to install JavaScript via npm packages. However, there are situations where you may need to include an external JavaScript file, which can be a bit tricky with modern tools. In this blog post, we’ll explore how to include an external JavaScript file in a Gatsby site. The Challenge Let’s say we want to embed a video from Wistia in our Gatsby site. Wistia provides an HTML snippet to embed the video....

When working with the canvas npm package to draw images server-side using the Canvas API, you may need to load an image onto the canvas. Here’s a step-by-step guide on how to achieve this in Node.js: Start by loading the loadImage() function from the canvas package: const { createCanvas, loadImage } = require('canvas'); Create the canvas with the desired width and height: const width = 1200; const height = 630; const canvas = createCanvas(width, height); const context = canvas....

Logging all incoming requests in an Express app can be a useful way to track and analyze traffic. In this blog post, we will explore a simple method of achieving this by logging requests to the console. To implement this solution, we will use the express-requests-logger package, which provides a convenient middleware for logging requests. Let’s get started! First, you need to install the express-requests-logger package by running the following command in your terminal:...

When it comes to logging objects in Node.js, things can be a bit trickier compared to doing so in a browser environment. The console.log() function in Node.js simply outputs the object as a string representation, which may not be ideal, especially for complex objects with nested properties. By default, Node.js will print [Object] as a placeholder when an object goes beyond two levels of nesting. However, there are a couple of ways to overcome this limitation and log the object in a readable format....

In this tutorial, we will learn how to perform a loop inside a React component using JSX. Let’s say we have an items array and we want to iterate over it to display all the items. To accomplish this, follow these steps: Start by creating a <ul> element inside the returned JSX. This will serve as the container for the list of items. return ( <ul> </ul> ) Within the <ul> element, add a JavaScript snippet using curly brackets {} to include dynamic code....

In this tutorial, you will learn how to loop over an array in the Bash shell script. Whether you are a beginner or an experienced Bash developer, iterating over elements in an array is a fundamental skill that you’ll find useful in many situations. Let’s start with an example array that contains three strings: list=( "first" "second" "third" ) Now, let’s loop over the elements in the list array: for i in "${list[@]}" do : echo $i done In the example above, the for loop iterates over each element of the array using the "${list[@]}" syntax....