From 17fc9fe64f4de1bc58596034c54ddb487f992c9f Mon Sep 17 00:00:00 2001
From: sanine <sanine.not@pm.me>
Date: Mon, 30 Oct 2023 01:00:53 -0500
Subject: add mut_genome_delete

---
 src/genome/genome.js      |  9 +++++++++
 src/genome/genome.test.js | 25 +++++++++++++++++++++++++
 2 files changed, 34 insertions(+)

(limited to 'src')

diff --git a/src/genome/genome.js b/src/genome/genome.js
index d35b68c..16b5e4d 100644
--- a/src/genome/genome.js
+++ b/src/genome/genome.js
@@ -120,3 +120,12 @@ export function mut_genome_insert(
     [...genome, [source, sink, weight]],
   ];
 }
+
+
+export function mut_genome_delete(
+  [n_input, n_internal, n_output, genome], r
+) {
+  const del_idx = Math.floor(r * genome.length);
+  const new_genome = genome.filter((_, idx) => idx != del_idx);
+  return [n_input, n_internal, n_output, new_genome];
+}
diff --git a/src/genome/genome.test.js b/src/genome/genome.test.js
index d7dbe72..a021073 100644
--- a/src/genome/genome.test.js
+++ b/src/genome/genome.test.js
@@ -8,6 +8,7 @@ import {
   mut_gene_weight,
   mut_genome_expand,
   mut_genome_insert,
+  mut_genome_delete,
 } from './genome';
 
 
@@ -186,3 +187,27 @@ test('insert new genes', () => {
     [[0, 2, -4], [2, 1, 4]]
   ]);
 });
+
+
+test('remove genes', () => {
+  const n_input = 0;
+  const n_output = 0;
+  const n_internal = 3;
+  const genome = [
+    [0, 1, 0], [1, 2, 0],
+  ];
+
+  expect(mut_genome_delete([
+    n_input, n_internal, n_output, genome
+  ], 0.0)).toEqual([
+    n_input, n_internal, n_output, 
+    [[1, 2, 0]],
+  ]);
+
+  expect(mut_genome_delete([
+    n_input, n_internal, n_output, genome
+  ], 0.99)).toEqual([
+    n_input, n_internal, n_output, 
+    [[0, 1, 0]],
+  ]);
+});
-- 
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