# control

If you end with a complete statement, lexer puts `;` so `{`/`else` must be on same line

## If

```go
if x < 0 && err == nil{
    result = "Greater"
} else if x == 0 {
    result = "Equal"
} else {
    result = "Less"
}
```

### Scoping

Can scope to conditonal block

```go
if x := 42; x < 0 {
    //....
}
fmt.Println(x) //WONT WORK
```

## Switch

Like C/Java, but evaluates any simple type and no breaks needed jumps after block fround

```go
//switch dow {
switch dow := rand.Intn(6); dow {
    case 1:
        //..
    case 7:
        //..
    default:
        //..
}
```

Can do if like stuff

```go
x := -42;
switch {
    case x > 0:
        result = "Greater"
    case x < 0:
        result = "Less"
        fallthrough //execute everything below too
    default:
        result = "Equal or Less"
}
```

## For

#### Basic

```go
for i := 0; i < 10; i++ {
    sum += i
}
```

#### Over a collections

```go
for i := 0; i < len(colors); i++ {
    fmt.Println(colors[i])
}

for i := range colors { //set i to current index    
    fmt.Println(colors[i])
}
```

#### While

```go
for sum < 1000 {
    sum += sum
    if sum > 500 {
        break
    }
}
```

## GO-TO!!!

with labels and jumps

```go
endofprogram : fmt.Println("start of program")

if sum > 200 {
    sum -= sum
    goto endofprogram
}
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://openai.gitbook.io/code-cheatsheets/all/go/control.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.