what is difference beetween make(map[string]int) and map[string]int

[alio...@gmail.com]

what is difference of these in go lang

    array := make(map[string]int)

    array2 := map[string]int

i am printing both variables like `fmt.Println(array, array2)` then i cannot any differences beetween these

is the only difference make function have second parameter that we can define number of instance ?

[Shawn Milochik]

On Fri, Apr 17, 2015 at 11:04 AM, <alio...@gmail.com> wrote:

what is difference of these in go lang

    array := make(map[string]int)

    array2 := map[string]int

Make allocates memory. The "array2" line doesn't compile as shown. It's an incomplete map literal.

You can make it compile by changing it to "var array2 map[string]int," but then when you try assigning something to it you'll get a panic because it's a "nil map." So you'd have to "make" a map and assign it to that variable.

To complete the literal, you could do something like this:

a1 := map[string]int{"foo": 42}

fmt.Println(a1)

[Nigel Tao]

The make form lets you supply a size hint. The literal form lets you
specify initial elements. If you're doing neither, then

m0 := make(map[string]int)
m1 := map[string]int{}

are equivalent.