# Sort an array of composite structures

```ruby
# Declare an array of pairs
var people = [['joe', 120], ['foo', 31], ['bar', 51]]
 
# Sort the array in-place by name
people.sort! {|a,b| a[0] <=> b[0] }
 
# Alternatively, we can use the `.sort_by{}` method
var sorted = people.sort_by { |item| item[0] }
 
# Display the sorted array
say people
```

#### Output:

```
[["bar", 51], ["foo", 31], ["joe", 120]]
```


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