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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.
The zero value of slice is nil.
Non-nil 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.
lowIndex, highIndex, or both can be omitted to use the entire array on that side of the colon.
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 as well as an array of 3 messages. You've been provided with constants representing the plan types at the top of the file.