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Can you convert a string to an integer in JavaScript?
Obviously, converting to a Number gives you a value that might be a float rather than an integer, so if you want an integer, you need to modify it. There are a few ways of doing this:
How to convert user input to a number?
All user input will be read as a String, so in order to treat user input as numbers, you’ll need to convert the input: const num = prompt (‘Enter a number: ‘); console.log (‘Your number + 4 =’); console.log (Number (num) + 4);
How to get user input in Node.js?
The prompt-sync module is a function that creates prompting functions, so you need to call prompt-sync in order to get your actual prompting function. Once you’ve loaded the prompt-sync module and called it, using it to retrieve user input is relatively straightforward: const prompt = require(‘prompt-sync’) ();
How does synchronous input work in Node.js?
Synchronous Input Node.js allows you to run JavaScript code outside of a browser window, offering powerful tools to interact with a computer filesystem, run web servers, and create terminal applications.
How to convert a string to a number?
So adding a debug node to the output of the MATT in node will show you the msg type and you can see if you need/want to run it thru a ‘JSON’ node before using it (this has bit me in the past) As you can see, the values comming from topic Umidade (MQTT) I see as string I need to convert to number, because the chart does not change
Is there a way to get a string on Node RED?
The command node-red-log should show you the log if you are not running node-red in a terminal. Indeed – simple strings do seem to work on latest. Thanks for opening my eyes to JSONata. This is easy and makes the Flow very understandable and reusable without writing a function.
How to parse a string and return an integer?
The parseInt () function parses a string argument and returns an integer of the specified radix (the base in mathematical numeral systems). or parseFloat () The parseFloat () function parses an argument and returns a floating point number.