CODEWITHSUNDEEP
javascriptnode.js
Santiago D'Antuoni
Santiago D'Antuoni

Reputation: 162

Throttle a function in NodeJS

i have a problem, i need to make a interval of five second when you can execute a function or not. Why? Because i has listening a Arduino serial port, so the arduino serial port returns a lot of signals when i press a button, but in my node code, i want to handle just one signal every five seconds, and execute the sound() function, how i can made that?

serialport.on("open", function() {
  console.log("Serial Port Opend");
  serialport.on("data", function(data) {
    var start = Date.now();
    if (data[0]) {
      sound();
    }
  });
});

function sound() {
  //...
}

Upvotes: 0

Views: 2218

Answers (1)

Tarwin Stroh-Spijer
Tarwin Stroh-Spijer

Reputation: 353

Try a throttle function such as the one in lodash

https://lodash.com/docs/4.17.4#throttle

var _ = require('lodash');

serialport.on("open", function() {
  console.log("Serial Port Opend");
  serialport.on("data", function(data) {
    var start = Date.now();
    if (data[0]) {
      sound();
    }
  });
});

var sound = _.throttle(function () {
  //...
}, 5000);

Upvotes: 1

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