Arrays

In Go, an array is a numbered sequence of elements of a specific length.

var a [5]int creates an array that will hold exactly 5 int(s). The type of elements and length are both part of the arrays type. By default an array is zero-valued, which for int(s) means 0.

We can set a value at an index using the array[index] = value syntax, and get a value with array[index].

The built-in len() returns the length of an array.

Use arrName := [n]int{1,3,4,5,6...n} syntax to declare and initialize an array in one line.

Array types are 1 dimensional but multi-dimensional types can be composed to build multidimensional data structures.

Slices are more common in Go.

I tried but I can't have multi-type data arrays such as var twoDTwo [2]int[3]string

part 2

Go's arrays are values. An array variable denotes the entire array; it is not a pointer to the first array element (as would be the case in C). This means that when you assign or pass around an array value you will make a copy of its contents. (To avoid the copy you could pass a pointer to the array, but then that's a pointer to an array, not an array). One way to think about arrays is as a sort of struct but with indexed rather than named fields: a fixed size composite value.

An array literal can be specified as so: b := [2]string{"Penn", "Teller"} Or you can have the compiler count the array elements for you: b := [...]string{"Penn", "Teller"} in both cases the type of b is [2]string