I am brand new to Java Script and was trying to condense my code down by a lot. Here is my original code:

function createColoredCalendarEvent() {
  let events = SpreadsheetApp.getActiveSpreadsheet().getRangeByName("events").getValues();
  events.forEach(function(e){
    if (e[7] === "Weekly" && e[5].includes(":") === true) {
      CalendarApp.getCalendarById("59a4dd9d635128eacd6e298dd977b68f7d8ee9aa9b779e9a58cc3c745eec23a2@group.calendar.google.com").createEvent(
        e[0].concat(", ", e[3], ", ", e[6]),
        new Date(e[5]),
        new Date(e[5]),
        {description: e[1].concat(", last compleated: ", e[4])},
      ).setColor(CalendarApp.EventColor.PALE_BLUE);
    } else if (e[7] === "Monthly" && e[5].includes(":") === true) {
      CalendarApp.getCalendarById("59a4dd9d635128eacd6e298dd977b68f7d8ee9aa9b779e9a58cc3c745eec23a2@group.calendar.google.com").createEvent(
        e[0].concat(", ", e[3], ", ", e[6]),
        new Date(e[5]),
        new Date(e[5]),
        {description: e[1].concat(", last compleated: ", e[4])},
      ).setColor(CalendarApp.EventColor.GREEN);
    } else if (e[7] === "Quarterly" && e[5].includes(":") === true) {
      CalendarApp.getCalendarById("59a4dd9d635128eacd6e298dd977b68f7d8ee9aa9b779e9a58cc3c745eec23a2@group.calendar.google.com").createEvent(
        e[0].concat(", ", e[3], ", ", e[6]),
        new Date(e[5]),
        new Date(e[5]),
        {description: e[1].concat(", last compleated: ", e[4])},
      ).setColor(CalendarApp.EventColor.MAUVE)
    } else if (e[7] === "Biannually" && e[5].includes(":") === true) {
      CalendarApp.getCalendarById("59a4dd9d635128eacd6e298dd977b68f7d8ee9aa9b779e9a58cc3c745eec23a2@group.calendar.google.com").createEvent(
        e[0].concat(", ", e[3], ", ", e[6]),
        new Date(e[5]),
        new Date(e[5]),
        {description: e[1].concat(", last compleated: ", e[4])},
      ).setColor(CalendarApp.EventColor.BLUE);
    } else if (e[7] === "Annually" && e[5].includes(":") === true) {
      CalendarApp.getCalendarById("59a4dd9d635128eacd6e298dd977b68f7d8ee9aa9b779e9a58cc3c745eec23a2@group.calendar.google.com").createEvent(
        e[0].concat(", ", e[3], ", ", e[6]),
        new Date(e[5]),
        new Date(e[5]),
        {description: e[1].concat(", last compleated: ", e[4])}
      ).setColor(CalendarApp.EventColor.GRAY);
    } else if (e[5] === "N/A" || e[5] === "12/30/1899" || e[5].includes(":") === false) {
        console.log(e[0], " is not an applicable event. This event was not added to your Calendar")
    }
  })
}

As you can see it can be condensed a lot, I am just too new to this language to know the correct syntax and methods.

This was my attempt at condensing it (that failed quite badly)

function createColoredCalendarEvent() {
  let events = SpreadsheetApp.getActiveSpreadsheet().getRangeByName("events").getValues();
  events.forEach(function(e){
    createCalendarEvent.apply(null, e).setColor(CalendarApp.EventColor.RED)
  })
}

function createCalendarEvent(a, b, c, d, e, f, g){
  CalendarApp.getCalendarById("59a4dd9d635128eacd6e298dd977b68f7d8ee9aa9b779e9a58cc3c745eec23a2@group.calendar.google.com").createEvent(
    {a}.concat(", ", {d}, ", ", {g}),
    new Date({f}),
    new Date({f}),
    {description: {b}.concat(", last completed: ", {e})},
  )
}

I keep getting an error that says

“TypeError: {(intermediate value)}.concat is not a function”.

How can I effectively condense my code?