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The type is not necessary because the Go compiler is able to infer the type based on the literal value you assign the variable.(Since you are assigning a string literal, Generally you should use this shorter form whenever possible.
It's also more clear, where I'd see the "for range s" and think "for range what?
I'm iterating over something and not using it?
In computer programming, an assignment statement sets and/or re-sets the value stored in the storage location(s) denoted by a variable name; in other words, it copies a value into the variable.
In most imperative programming languages, the assignment statement (or expression) is a fundamental construct.
The set of values allowed to store in variable is determined by the variable’s type.
Because of that arbitrary data can’t be just assigned as in dynamically typed language like Python.
Let's change the program we wrote in chapter 2 so that it uses a variable: symbol we have a tendency to read that as “x equals the string Hello World”.
There's nothing wrong with reading our program that way, but it's better to read it as “x takes the string Hello World” or “x is assigned the string Hello World”.
The Go compiler doesn't care what you name a variable so the name is meant for your (and others) benefit.
Pick names which clearly describe the variable's purpose.