# Interface EditDistance<R>

Type Parameters:
`R` - The type of similarity score unit used by this EditDistance.
All Superinterfaces:
`SimilarityScore<R>`
All Known Implementing Classes:
`CosineDistance`, `HammingDistance`, `JaccardDistance`, `JaroWinklerDistance`, `LevenshteinDetailedDistance`, `LevenshteinDistance`, `LongestCommonSubsequenceDistance`

```public interface EditDistance<R>
extends SimilarityScore<R>```
Interface for Edit Distances.

An edit distance is a formal metric on the Kleene closure (`X<sup>*</sup>`) over an alphabet (`X`). Note, that a metric on a set `S` is a function `d: [S * S] -&gt; [0, INFINITY)` such that the following hold for `x,y,z` in the set `S`:

• `d(x,y) &gt;= 0`, non-negativity or separation axiom
• `d(x,y) == 0`, if and only if, `x == y`
• `d(x,y) == d(y,x)`, symmetry, and
• `d(x,z) &lt;= d(x,y) + d(y,z)`, the triangle inequality

This is a BiFunction<CharSequence, CharSequence, R>. The `apply` method accepts a pair of `CharSequence` parameters and returns an `R` type similarity score.

Since:
1.0
• ## Method Summary

Modifier and Type Method Description
`R` ```apply​(CharSequence left, CharSequence right)```
Compares two CharSequences.
• ## Method Details

• ### apply

R apply​(CharSequence left, CharSequence right)
Compares two CharSequences.
Specified by:
`apply` in interface `SimilarityScore<R>`
Parameters:
`left` - the first CharSequence
`right` - the second CharSequence
Returns:
The similarity score between two CharSequences