![nodejs map nodejs map](https://i.stack.imgur.com/DoWod.png)
#Nodejs map how to
Hopefully this article has been useful for you to understand how to obtain a sorted map in your JavaScript code. Map(4) Īs you can see, the map is now sorted by values. sorted_map_by_keys = new Map(.sort((a, b) => String(a).localeCompare(b)))
#Nodejs map code
We can get a sorted map by keys in our JavaScript code with the sort function applied to the keys in the following way. We can easily get a sorted map in our JavaScript code with the JavaScript sort() function. Since the default order for a JavaScript map object is by order of insertion, we need to write our own code if we want to sort the map by the keys or the values to get a sorted map. By default, the map object orders the key-value pairs by the order of insertion. In JavaScript, the map object is useful for holding key-value pairs. Sorted_map_by_str_values = new Map(.sort((a, b) => String(a).localeCompare(b))) Sorted_map_by_num_values = new Map(.sort((a, b) => a - b)) MongoClient.With JavaScript, we can easily sort a map by keys or get a sorted map by values using the JavaScript sort() function. Var MongoClient = require('mongodb').MongoClient Var url_parts = url.parse(req.url, true) Inserting values into the collection passengers var http = require('http') In the sequence using the created client, called MongoClient, where we will create a document in the JSON format with the name, latitude and longitude values and finally perform the insertion in MongoDB. The first few lines of Listing 5, as indicated by the comments, connect to MongoDB. That is, we retrieve the name of the passenger, his or her latitude and length, then we insert them in the passenger collection via the driver.
#Nodejs map driver
With the driver installed, we can create a new file Node.js (to start this file execute nodejs insert.js) responsible for sending the information to MongoDB. Nodejs insert.js // Start the node.js script
#Nodejs map install
Npm install jquery // Installs the integration of Node.js with JQuery The first step is to install Node.js and the driver called MongoJS: sudo apt-get install nodejs // Installs Node.js
![nodejs map nodejs map](https://raw.githubusercontent.com/SalatielSauer/OGZ-Editor/master/images/screenshot-3.png)
Next we will integrate the Google Maps API using the Node.js driver for MongoDB. Insertion of values in the collection passengers, named insert.js db.passageiros.insert( In this example, we created a point using latitude and longitude values, however, GeoJSON allows you to also create lines and polygons. This insert uses the standard called GeoJSON to insert the position of the passenger retrieved in Listing 3. Through the command line we can insert values to this collection, as shown in Listing 4. This collection will receive JSON documents that will represent the position of the passengers inserted in Listing 2. Geo-positioning function function getLatLong() ) The values returned by this function will be sent to the Node.js server via a GET call that will insert them into the MongoDB shown later. The returned value of this method is added to the final. It is called for each of the array arr elements. user, which will contain the name of the passenger. Syntax of map: The syntax of JavaScript map method is defined as like below : let finalArray arr.map(callback( currentValue, index, array), arg) Following are the meanings of these parameters : callback: This is the callback method.location, which will contain the address of the passenger and.Listing 2 shows how to create the page using geocoder, which will return latitude and longitude values from the address entered on a page, in which case we do not display the HTML code, but we expect that there will be of the text boxes: We should add the CSS, the jQuery library and, most importantly, the API to which we must pass the key - put your call in - created earlier, as explained in Listing 1. Once we have the access key, we’ll import the Google Maps API scripts into the new page. On this page, we can create a Google Maps API access key.
#Nodejs map registration
To use the Google Maps API, we must have a previous Google registration and go to. The process of discovering geographic position from the address is called geo-positioning, and the Google Maps API helps us in this process. This page will receive the name and address of the passenger. Getting Started with Geo-Positioningįirst, let’s create the HTML page to enter the passenger data. In addition, MongoDB uses JSON to describe and store documents. sortedmapbystrvalues new Map(.map.sort((a, b) > String(a1).localeCompare(b1. Its code is open and can be used across platforms and language clients. MongoDB, whose name comes from “humongous” in American slang to describe something very large, was created in 2009 and is currently the most-used NoSQL-like database in the world. The Google Maps API allows you to use most of the features available to create applications with the ability to retrieve the latitude and longitude of an address, add a marker to a map, create an area (a polygon or a circle) and calculate the distance between two points, and more.