Method to deep copy characters

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@vestaboard/vbml",
-  "version": "1.0.12",
+  "version": "1.0.13",
   "description": "The Vestaboard markup language",
   "main": "lib/index.js",
   "scripts": {

src/__tests__/characterCodesToString.spec.ts

@@ -40,15 +40,15 @@ describe("Convert array of array of characters to a string", () => {
   it("Should handle line breaks", () => {
     const result = characterCodesToString(
       [
-        [1, 1, 0, 0, 0],
-        [2, 2, 0, 0, 0],
+        [1, 2, 0, 0, 0],
+        [3, 4, 0, 0, 0],
       ],
       {
         allowLineBreaks: true,
       }
     );
 
-    expect(result).toEqual("AA\nBB");
+    expect(result).toEqual("AB\nCD");
   });
 
   it("Should assume there is no line break if the first word can fit on the previous line", () => {

src/__tests__/copyCharacterCodes.spec.ts

@@ -0,0 +1,13 @@
+import { copyCharacterCodes } from "../copyCharacterCodes";
+
+describe("Copy character codes", () => {
+  it("Should deep copy character codes", () => {
+    const characters = [[1, 2]];
+    const result = copyCharacterCodes(characters);
+    expect(result).toEqual([[1, 2]]);
+    expect(result).not.toBe(characters);
+
+    characters[0][0] = 3;
+    expect(result[0][0]).toEqual(1);
+  });
+});

src/copyCharacterCodes.ts

@@ -0,0 +1,4 @@
+// Returns a deep copy of the character codes array
+export const copyCharacterCodes = (characters: number[][]) => [
+  ...characters.map((row) => [...row]),
+];

src/index.ts

@@ -5,6 +5,7 @@ import { parseComponent } from "./parseComponent";
 import { IVBML } from "./types";
 import { characterCodesToString } from "./characterCodesToString";
 import { characterCodesToAscii } from "./characterCodesToAscii";
+import { copyCharacterCodes } from "./copyCharacterCodes";
 
 // Flagship size
 const BOARD_ROWS = 6;
@@ -24,6 +25,7 @@ export const vbml = {
   },
   characterCodesToString,
   characterCodesToAscii,
+  copyCharacterCodes,
 };
 
 export * from "./types";