Instance Method

# min(by:)

Returns the minimum element in the sequence, using the given predicate as the comparison between elements.

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## Parameters

`areInIncreasingOrder`

A predicate that returns `true` if its first argument should be ordered before its second argument; otherwise, `false`.

## Return Value

The sequence’s minimum element, according to `areInIncreasingOrder`. If the sequence has no elements, returns `nil`.

## Discussion

The predicate must be a strict weak ordering over the elements. That is, for any elements `a`, `b`, and `c`, the following conditions must hold:

• `areInIncreasingOrder(a, a)` is always `false`. (Irreflexivity)

• If `areInIncreasingOrder(a, b)` and `areInIncreasingOrder(b, c)` are both `true`, then `areInIncreasingOrder(a, c)` is also `true`. (Transitive comparability)

• Two elements are incomparable if neither is ordered before the other according to the predicate. If `a` and `b` are incomparable, and `b` and `c` are incomparable, then `a` and `c` are also incomparable. (Transitive incomparability)

This example shows how to use the `min(by:)` method on a dictionary to find the key-value pair with the lowest value.

Complexity: O(n), where n is the length of the sequence.