# The for loop — Go (Golang)

Source: https://www.geekswithgeeks.com/en/go/go-for

> Explain The for loop, test a small program, and use the result to build confidence.

## The essential idea

**The for loop** becomes clear when you identify its job before memorising syntax. In Go, small explicit pieces combine into programs that are easy to read, build, and change.

## Trace each loop pass

Keep the path from source file to compiled program in mind as you learn this part.

```go
sum := 0
for n := 1; n <= 3; n++ {
  sum += n
}
fmt.Println(sum)
```

Output:

```
6
```

- Line 1: The running total exists before the loop starts.
- Line 2: The first valid n enters the loop body.
- Line 3: The body changes the accumulated value.
- Line 5: After the last pass, the final total prints once.

## A useful habit

Do not copy a solution blindly. For **The for loop**, change one value, run `go test` or `go run`, and explain why the result changed.

Quick check

**Quiz:** How should you learn The for loop?

- [x] Run one focused example and inspect the result.
- [ ] Memorize it without writing code.
- [ ] Skip compiler and test feedback.

*Answer:* Run one focused example and inspect the result.. Small experiments reveal cause and effect.