> For the complete documentation index, see [llms.txt](https://ploegert.gitbook.io/til/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ploegert.gitbook.io/til/programmy/ruby/are-they-all-true.md).

# Are They All True?

There is a method on `Enumerable` that allows you to check against everything in a collection. This is the `all?` method. For instance, if you want to check if an array of values are all truthy, you can call it without arguments:

```ruby
> [true, 1, ''].all?
# true
> [true, false, true].all?
# false
```

You can also pass it a block which is helpful if you want to check an attribute or method on a collection of objects, like so:

```ruby
> employees.all?(&:salaried?)
# true
> [1,2,3,4,5].all?(&:odd?)
# false
```