# reduce

Source: https://taxilang.org/docs/language/stdlib/reduce

**Full name:** `taxi.stdlib.reduce`

## Signature

```taxi
declare extension function <T,A> reduce(collection: T[], callback: (T,A) -> A):A
```

## Description

Reduces a collection to a single value by applying a combining function to each element and the accumulated result.

Unlike `fold`, there is no initial value — the first element of the collection is used as the starting accumulator.

```taxi
// Sum a list of integers
find {
   total: Int = numbers.reduce((Int, Int) -> Int + Int)
}
```