From 95b5f4d19e47f9f150748beda11e5a808feeaf5f Mon Sep 17 00:00:00 2001
From: jobo322 <jose.bolanos@correounivalle.edu.co>
Date: Mon, 7 Jul 2025 08:55:56 -0500
Subject: [PATCH 1/3] refactor: optimize to2DArray method to use Float64Array
 and improve performance

---
 src/index.js | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/src/index.js b/src/index.js
index 6c23c82..8b0223d 100644
--- a/src/index.js
+++ b/src/index.js
@@ -64,16 +64,16 @@ export class SparseMatrix {
   }
 
   /**
-   * @returns {number[][]}
+   * @returns {Float64Array[]}
    */
   to2DArray() {
-    const copy = new Array(this.rows);
-    for (let i = 0; i < this.rows; i++) {
-      copy[i] = new Array(this.columns);
-      for (let j = 0; j < this.columns; j++) {
-        copy[i][j] = this.get(i, j);
-      }
-    }
+    const copy = Array.from({ length: this.rows }, () =>
+      Float64Array.from({ length: this.columns }),
+    );
+    this.withEachNonZero((i, j, v) => {
+      copy[i][j] = v;
+    });
+
     return copy;
   }
 

From a80cfea33c9cd258e9b54d155a67bbf3c5435752 Mon Sep 17 00:00:00 2001
From: jobo322 <jose.bolanos@correounivalle.edu.co>
Date: Mon, 7 Jul 2025 08:57:24 -0500
Subject: [PATCH 2/3] chore: keep output typing

---
 src/index.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/index.js b/src/index.js
index 8b0223d..160fa09 100644
--- a/src/index.js
+++ b/src/index.js
@@ -64,11 +64,11 @@ export class SparseMatrix {
   }
 
   /**
-   * @returns {Float64Array[]}
+   * @returns {number[][]}
    */
   to2DArray() {
     const copy = Array.from({ length: this.rows }, () =>
-      Float64Array.from({ length: this.columns }),
+      Array.from({ length: this.columns }, () => 0),
     );
     this.withEachNonZero((i, j, v) => {
       copy[i][j] = v;

From cc9de1e93522f4550700ca8d625f8ec35838b873 Mon Sep 17 00:00:00 2001
From: jobo322 <jose.bolanos@correounivalle.edu.co>
Date: Mon, 7 Jul 2025 16:55:16 -0500
Subject: [PATCH 3/3] chore: avoid the use of callbacks to fill the rows

---
 src/index.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/index.js b/src/index.js
index 160fa09..22ceb43 100644
--- a/src/index.js
+++ b/src/index.js
@@ -68,7 +68,7 @@ export class SparseMatrix {
    */
   to2DArray() {
     const copy = Array.from({ length: this.rows }, () =>
-      Array.from({ length: this.columns }, () => 0),
+      new Array(this.columns).fill(0),
     );
     this.withEachNonZero((i, j, v) => {
       copy[i][j] = v;