Creating an SMS group forwarder in Twilio with NodeJS - node.js

Question

Here's what I'm trying to accomplish:
Set a list of names and numbers (my "group")
When a text message is sent to the Twilio number, forward it on to every member in the group
At a high-level, the idea seems straight forward enough. My programming / syntax skills are rusty, though, and I'd love some help.
I'm using Twilio Functions, and I've been able to send and receive messages successfully. Now I am stuck on how to carry this idea of iterating through a group.
Here's what I've written so far:
var groupmembers = {
jonathan:{
name: 'Jonathan',
number: '+0000000000'
},
joshua:{
name: 'Joshua',
number: '[phone]'
}
}
exports.handler = function(context, event, callback) {
// Set some values for later use
this.fromNumber = event.From
this.body = event.Body || ''
let twiml = new Twilio.twiml.MessagingResponse();
groupmembers.forEach(function(member) {
// Skip sending if it's the same number
if (member.number === this.fromNumber ) {
return;
}
// Otherwise, let's send a mesage!
twiml.message("Hello World").to( member.number );
callback(null, twiml);
});
};
The issues I believe I have:
Not being sure how to properly set my array or "dictionary"
Not knowing the proper syntax for passing the "to" variable to the message
Not knowing the proper syntax for doing a loop in NodeJS (the Functions console is telling me that 'groupmembers.forEach is not a function')
Thank you for any and all feedback and for pointing me in the right direction!

Answer 1

The mistake you have is pretty simple. groupmembers is an object, you want an array.
You may want something akin to this instead:
var groupmembers = [{
name: 'Jonathan',
number: '+0000000000'
},
{
name: 'Joshua',
number: '[phone]'
}]
Apart from that, it looks to me as okay.

Answer 2

With more searching and the point in the right direction from Slava I was able to figure it out! Here's the complete code:
/**
* Represents a search trough an array.
* #function search
* #param {Array} array - The array you wanna search trough
* #param {string} key - The key to search for
* #param {string} [prop] - The property name to find it in
* Props: https://stackoverflow.com/a/33097318/315818
*/
function search(array, key, prop){
// Optional, but fallback to key['name'] if not selected
prop = (typeof prop === 'undefined') ? 'name' : prop;
for (var i=0; i < array.length; i++) {
if (array[i][prop] === key) {
return array[i];
}
}
}
var groupmembers = [
{
name: 'Jonathan',
number: '+000000000'
},
{
name: 'Joshua',
number: '[phone]'
}
];
exports.handler = function(context, event, callback) {
let twiml = new Twilio.twiml.MessagingResponse();
// Search for the group member that matches the sender number
let sender = search(groupmembers, event.From, 'number');
// Now, loop through each of the group members
groupmembers.forEach(function(member) {
// Skip sending if it's the same number
if (member.number === event.From ) {
return;
}
// Now, forward on the message to the group member, using the sender's name
twiml.message(`${sender.name}: ${event.Body}`, {
to: member.number
});
});
// Loop ended
callback(null, twiml);
};