How to use promise.all and map in javascript?

Sabina Wyman asked a question: How to use promise.all and map in javascript?
Asked By: Sabina Wyman
Date created: Wed, Jul 28, 2021 8:42 AM
Date updated: Wed, Jun 22, 2022 9:14 PM


Top best answers to the question «How to use promise.all and map in javascript»

  • In this quick example, we'll learn how to use Promise.all () and map () with Async/Await in JavaScript to impelemt certain scenarios that can't be implemented with for loops with async/await.


Those who are looking for an answer to the question «How to use promise.all and map in javascript?» often ask the following questions:

💻 Can javascript connect with mysql?

  • Simple answer is: no. JavaScript is a client-side language that runs in the browser ( node.js notwithstanding) and MySQL is a server-side technology that runs on the server. That means you typically use a server-side language like ASP.NET or PHP to connect to the database.

💻 What is map () in javascript?

Map is a collection of elements where each element is stored as a Key, value pair. Map object can hold both objects and primitive values as either key or value. When we iterate over the map object it returns the key,value pair in the same order as inserted.

💻 Does javascript map allow duplicate keys?

Map Keys. Maps accept any data type as a key, and do not allow duplicate key values.

Your Answer

We've handpicked 23 related questions for you, similar to «How to use promise.all and map in javascript?» so you can surely find the answer!

How do you map an object in javascript?

function map(obj, callback) { var result = {}; Object. keys(obj). forEach(function (key) { result[key] = callback. call(obj, obj[key], key, obj); }); return result; } newObject = map(myObject, function(x) { return x * x; });

How does a source map work in javascript?
  • Well now you can through the magic of source maps. Basically it's a way to map a combined/minified file back to an unbuilt state. When you build for production, along with minifying and combining your JavaScript files, you generate a source map which holds information about your original files.
How to access sql database from javascript test?
  • The values we expect to show up in the database are taken from the Scenario. To have them accessible in the last step, we have to preserve them in the previous step; by putting them into the context’s userData space. In the last step’s implementation, we start with establishing a connection to our SQL database.
How to add google maps javascript api key?
  • You’ll need the following APIs: Google Maps JavaScript API, Places API, Geocoding API. Let’s add them in order. Google Maps JavaScript API – in the search field type ‘Maps JavaScript API’ and click on it. You’ll be navigated to the added API dashboard. Go back to the list of APIs to continue enabling them.
How to connect database in php using javascript?

How do I access my MySQL database?

  • In order to access your MySQL database, please follow these steps: Log into your Linux web server via Secure Shell. Open the MySQL client program on the server in the /usr/bin directory. Type in the following syntax to access your database:
How to connect to mysql server in javascript?
  • First, import the mysql module by using the following statement: let mysql = require ('mysql'); Code language: JavaScript (javascript) Second, create a connection to the MySQL database by calling the createConnection () method and providing the detailed information on MySQL server such as host, user, password and database as follows:
How to hide features in google maps javascript?
  • Select an option in this example to hide or show business points of interest (POIs) and public transit icons on the map. Read the documentation. // Add controls to the map, allowing users to hide/show features. // Apply new JSON when the user chooses to hide/show features. Note: Read the guide on using TypeScript and Google Maps.
How to load google maps data in javascript?
  • The Google Maps Data Layer provides a container for arbitrary geospatial data (including GeoJSON). If your data is in a file hosted on the same domain as your Maps JavaScript API application, you can load it using the () method.
How to run javascript file / program in browser?
  • So you can use FireFox console which you can open by pressing Ctrl+Shift+K Or by going under Web Developer option and choosing Web Console. And For the permanent part, you can make an HTML file of your javascript code and open that HTML file that file with FireFox.
How to store nested javascript objects in redis?
  • Back to our previous example, by using flat you can convert your nested objects to something like: With this, you can simply store it in Redis by doing: Now, if you just want to get the family name, you can: You can also do cool things like: Try that with JSON! Flat is not perfect. I’m not crazy about how it handles arrays.
What software can i use to write javascript?

Firstly JavaScript is a client side scripting. The language run by the web browsers. To write programs in this language we can use the following softwares: Chrome as web browser + browser console for debug.

Which is the best program to run javascript?

If you want to practice just the javascript; the famous REPL site; HackerRank is the best place to practice it. If you are practicing the JavaScript with Browser in mind, pick any system with latest browser.

Why do you need source maps in javascript?
  • Namely, because they are used to display your original JavaScript while debugging, which is a lot easier to look at than minified production code. In a sense, source maps are the decoder ring to your secret (minified) code. However, they can be tricky to get working properly.
Can a javascript application interact with a mongodb database?
  • If you’re building applications using NodeJS and the Express framework, you may want to interact with a MongoDB database from your code. Fortunately, this task is easy to accomplish using the Mongoose package for Javascript. In this first article of our two-part series, we’ll show you how to create an application using NodeJS, Express and MongoDB.
How fetch data from database and display in javascript?

Approach: First make the necessary JavaScript file, HTML file and CSS file. Then store the API URL in a variable (here api_url). Define a async function (here getapi()) and pass api_url in that function. Define a constant response and store the fetched data by await fetch() method.

How is a map created using the javascript api?
  • A web page or application that displays a map using the Maps JavaScript API. A map is created with the google.maps.Map () class. User interactions with the map, such as panning, zooming, or switching map layers, do not generate additional map loads.
How is the array map method used in javascript?
  • It is a non-mutating method. Generally map () method is used to iterate over an array and calling function on every element of array. Parameters: This method accepts two parameters as mentioned above and described below: function (currentValue, index, arr): It is required parameter and it runs on each element of array.
How to change the heading in google maps javascript?
  • Drag the markers on the map to see the origin, destination and heading change accordingly. Read the documentation. // This example requires the Geometry library. Include the libraries=geometry // parameter when you first load the API. For example: Note: Read the guide on using TypeScript and Google Maps.
How to connect login page to database in javascript?

Follow the following steps and create registration and login system in node js with MySQL DB:

  1. Step 1: Install Node Express JS Setup.
  2. Step 2: Connect Node Express Js App with DB.
  3. Step 3: Import Packages and routes in app. js.
  4. Step 4: Create Route.
  5. Step 5: Create Login & Registration Views.
  6. Step 6: Run Development Server.
How to find the size of map in javascript?
  • I want to print the size of map in javascript. I used the command map.size but the answer is coming 0 which is not correct.
How to get started with google maps javascript api?
  • Get Started with Google Maps Platform API Picker Billing Account Credits Billing Reporting FAQ Support and Resources Incident Management Maps Maps JavaScript API
What is the use of map function in javascript?

The map() method in JavaScript creates an array by calling a specific function on each element present in the parent array. It is a non-mutating method. Generally map() method is used to iterate over an array and calling function on every element of array.

What is the use of map values in javascript?
  • JavaScript Map values() method The JavaScript map values()method returns an object of new Mapiterator. This object contains the value for each element. It maintains insertion order.