Slices in Go

99 times out of 100 you will use a slice instead of an array when working with ordered lists.

Arrays are fixed in size. Once you make an array like [10]int you can't add an 11th element.

A slice is a dynamically-sized, flexible view of the elements of an array.

Slices always have an underlying array, though it isn't always specified explicitly. To explicitly create a slice on top of an array we can do:

primes := [6]int{2, 3, 5, 7, 11, 13}
mySlice := primes[1:4]
// mySlice = {3, 5, 7}

The syntax is:

arrayname[lowIndex:highIndex]
arrayname[lowIndex:]
arrayname[:highIndex]
arrayname[:]

Where lowIndex is inclusive and highIndex is exclusive

Either lowIndex or highIndex or both can be omitted to use the entire array on that side.

Assignment

Retries are a premium feature now! Textio's free users only get 1 retry message, while pro members get an unlimited amount.

Complete the getMessageWithRetriesForPlan function. It takes a plan variable as input, and you've been provided with constants for the plan types at the top of the program.

• If the plan is a pro plan, return all the strings from getMessageWithRetries().
• If the plan is a free plan, return the first 2 strings from getMessageWithRetries().
• If the plan isn't either of those, return an error that says unsupported plan.