https://tmijs.org/forums/index.php?/topic/101-h

index-1.js

//...

client.on('message', (channel, user, message, fromSelf) => {
    // Ignore bot's messages.
    if(fromSelf) {
        return false;
    }
    
    // The name of the user. (Will default to the lower case if the display name
    // is missing from the user object.)
    let name = user['display-name'] || user.username,
        // A pre-formatted string to go at the beginning of command outputs.
        greeting = `@${name},`
        // The text in the message split by spaces for easy use.
        params = message
                    // Remove extra whitespace on ends.
                    .trim()
                    // Replace multiple spaces with 1.
                    .replace(/\s{2,}/g, ' ')
                    // Split the string at spaces.
                    .split(' '),
        // Remove and return the first element.
        command = params.shift(),
        // Are there reamining parameters?
        hasParams = params.length > 0,
        // Default to the user if there's no first parameter.
        userParam = hasParams ? params[0] : user.username;
    
    // Is it a command?
    if(command[0] === '!') {
        // Remove the exclamation mark
        command = command.replace(/^!+/, '');
    }
    // Wasn't a command, ignore this normal message.
    else {
        return false;
    }
    
    // Check that the command was !logs
    if(command === 'logs') {
        // Make the reply to `channel` using the greeting, the link, and first
        // parameter or the username of the user if there's no parameter
        client.say(channel,
            `${greeting} http://logsplaceholder.com/userlogs/${userParam}`
            // Comes out like this:
            // @<name>, http://logsplaceholder.com/userlogs/<param[0] || name>
        );
    }
    
});

index-2-babel-ES5.js

'use strict';

//...

client.on('message', function (channel, user, message, fromSelf) {
    // Ignore bot's messages.
    if (fromSelf) {
        return false;
    }

    // The name of the user. (Will default to the lower case if the display name
    // is missing from the user object.)
    var name = user['display-name'] || user.username,

        // A pre-formatted string to go at the beginning of command outputs.
        greeting = '@' + name + ',';
        // The text in the message split by spaces for easy use.
        params = message
            // Remove extra whitespace on ends.
            .trim()
            // Replace multiple spaces with 1.
            .replace(/\s{2,}/g, ' ')
            // Split the string at spaces.
            .split(' '),
        // Remove and return the first element.
        command = params.shift(),
        // Are there reamining parameters?
        hasParams = params.length > 0,
        // Default to the user if there's no first parameter.
        userParam = hasParams ? params[0] : user.username;

    // Is it a command?
    if (command[0] === '!') {
        // Remove the exclamation mark
        command = command.replace(/^!+/, '');
    }
    // Wasn't a command, ignore this normal message.
    else {
        return false;
    }

    // Check that the command was !logs
    if (command === 'logs') {
        // Make the reply to `channel` using the greeting, the link, and first
        // parameter or the username of the user if there's no parameter
        client.say(channel,
            greeting + ' http://logsplaceholder.com/userlogs/' + userParam
            // Comes out like this:
            // @<name>, http://logsplaceholder.com/userlogs/<param[0] || name>
        );
    }
});