what is the difference between assertQueue and send To Queue in RabbitMq

Question

I have found Example for Sending String in rabittMq and Receiving from the queue but I am not clear about about these methods - assertQueue , sendToQueue

send.js

var amqp = require('amqplib/callback_api');

amqp.connect('amqp://localhost', function(err, conn) {
  conn.createChannel(function(err, ch) {

              var q = 'hello';
                var msg = 'Hello World! - '+i;

                ch.assertQueue(q, {durable: false});                    
                ch.sendToQueue(q, new Buffer(msg));
                console.log(" [x] Sent %s", msg);
  });
  setTimeout(function() { conn.close(); process.exit(0) }, 1000);
});

receive.js

var amqp = require('amqplib/callback_api');

amqp.connect('amqp://localhost', function(err, conn) {          //amqp://localhost
  conn.createChannel(function(err, ch) {
    var q = 'hello';

    ch.assertQueue(q, {durable: false});
    console.log(" [*] Waiting for messages in %s. To exit press CTRL+C", q);
    ch.consume(q, function(msg) {
      console.log(" [x] Received %s", msg.content.toString());
    }, {noAck: true});
  });
});

Answer 1

From your example,

assertQueue checks for "hello" queue, if it doesn't exist then it will create one.

sendToQueue put a message onto "hello" queue.

Answer 2

assertQueue is an declaration of queue and sendToQueue is pushing your message in the queue

To be noted : Declaring a queue is idempotent - it will only be created if it doesn't exist already