> For the complete documentation index, see [llms.txt](https://trizen.gitbook.io/sidef-lang/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://trizen.gitbook.io/sidef-lang/programming_tasks/d/dot_product.md).

# Dot product

```ruby
func dot_product(a, b) {
    (a »*« b)«+»;
}
say dot_product([1,3,-5], [4,-2,-1]);   # => 3
```