Go or Golang is a strongly typed language. So, basically the compiler needs to know what kind of data type it is dealing with.
There are 3 ways of declaring a variable.
1.
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var i int
Here i is the variable name and the data type is int.
The default value of the variable would be 0.
2.
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var s = "Hello World"
Here, s is the variable name and it is of the data type string.
Although it is not mentioned that the data type is string, the compiler implies from the value assigned to the variable that it is of type string.
3.
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s := "Hello World"
Here again, s is the variable name and it is of type string.
In this method you don’t have to use the keyword var. But if you look closely, the assignment operator is a bit different.
This method uses the operator := instead of =.
4.
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var a, b, c int
You can declare multiple variables together like above, if they are of the same data type.
You could use a similar mechanism when declaring functions as well.
For example:
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func Foo(a, b, c string) {
fmt.Println(a, b, c)
}
5.
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var (
i = 0
j = "hello world"
k = false
)
You can use this method to initialize multiple variables of different datatype, but together.
References: Effective Go, Go By Example
