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Fixed Go questions

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Added answers for go questions
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Noskov Artem 2020-02-12 10:20:30 +05:00 committed by GitHub
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@ -4765,6 +4765,11 @@ func main() {
}
```
</summary><br><b>
Constants in Go can only be declared using constant expressions.
But `x`, `y` and their sum is variable.
<br>
<code>const initializer x + y is not a constant</code>
</b></details>
<details>
@ -4788,10 +4793,21 @@ func main() {
}
```
</summary><br><b>
Go's iota identifier is used in const declarations to simplify definitions of incrementing numbers. Because it can be used in expressions, it provides a generality beyond that of simple enumerations.
<br>
`x` and `y` in the first iota group, `z` in the second.
<br>
[Iota page in Go Wiki](https://github.com/golang/go/wiki/Iota)
</b></details>
<details>
<summary>What _ is used for in Go?</summary><br><b>
It avoids having to declare all the variables for the returns values.
It is called the [blank identifier](https://golang.org/doc/effective_go.html#blank).
<br>
[answer in SO](https://stackoverflow.com/questions/27764421/what-is-underscore-comma-in-a-go-declaration#answer-27764432)
</b></details>
<details>
@ -4812,6 +4828,8 @@ func main() {
}
```
</summary><br><b>
Since the first iota is declared with the value `3` (` + 3`), the next one has the value `4`
</b></details>
## Mongo