Mark array() method as deprecated with warning message

src/math/p5.Vector.js

@@ -2934,9 +2934,12 @@ class Vector {
     return this.sub(surfaceNormalCopy.mult(2 * this.dot(surfaceNormalCopy)));
   }
 
+
+
   /**
-   * Returns the vector's components as an array of numbers.
+   * Returns the vector's first three components as an array of three numbers.
    *
+   * @deprecated array() will be removed in a future version of p5.js; use the more flexible v.values instead of v.array()
    * @return {Number[]} array with the vector's components.
    * @example
    * <div class = "norender">
@@ -2952,6 +2955,7 @@ class Vector {
    * </div>
    */
   array() {
+    this._showArrayDeprecationWarning();
     return [this.x || 0, this.y || 0, this.z || 0];
   }
 
@@ -3781,6 +3785,7 @@ class Vector {
    * method to copy into your own vector.
    */
   /**
+   * @deprecated
    * @static
    * @param  {p5.Vector} v the vector to convert to an array
    * @return {Number[]} an Array with the 3 values
@@ -3900,6 +3905,17 @@ function vector(p5, fn) {
    */
   p5.Vector = Vector;
 
+  let arrayDeprecationWarningShown = false;
+  Vector.prototype._showArrayDeprecationWarning = function() {
+    if (p5._friendlyError && !arrayDeprecationWarningShown) {
+      p5._friendlyError(
+        'array() is deprecated and will be removed in a future version of p5.js; use the more flexible v.values instead of v.array()',
+        'p5.Vector.array'
+      );
+      arrayDeprecationWarningShown = true;
+    }
+  };
+
   /**
    * The x component of the vector
    * @type {Number}

test/unit/math/p5.Vector.js

@@ -5,7 +5,8 @@ suite('p5.Vector', function () {
   var v;
 
   const mockP5 = {
-    _validateParameters: vi.fn()
+    _validateParameters: vi.fn(),
+    _friendlyError: vi.fn()
   };
   const mockP5Prototype = {};
 
@@ -2072,5 +2073,22 @@ suite('p5.Vector', function () {
         -4.10759023698152e-16, -2.23606797749979, 2
       ]);
     });
+    suite('deprecation warnings', function () {
+      test('array() should trigger deprecation warning', function () {
+        v = new mockP5.Vector(1, 2, 3);
+        v.array();
+        expect(mockP5._friendlyError).toHaveBeenCalledWith(
+          'array() is deprecated and will be removed in a future version of p5.js; use the more flexible v.values instead of v.array()',
+          'p5.Vector.array'
+        );
+      });
+
+      test('static array() should delegate to instance array()', function () {
+        v = new mockP5.Vector(1, 2, 3);
+        const spy = vi.spyOn(v, 'array');
+        mockP5.Vector.array(v);
+        expect(spy).toHaveBeenCalled();
+      });
+    });
   });
 });