feat: add reverse method.

Author: ghosind

src/dynamicBuffer.ts

@@ -691,6 +691,30 @@ export class DynamicBuffer {
     return this.compare(otherBuffer, 0, otherBuffer.length, 0, this.length) === 0;
   }
 
+  /**
+   * Reverses the buffer in place and returns the reference to the buffer. The first byte in the
+   * buffer now becoming the last, and the last byte in the buffer becoming the first.
+   *
+   * ```js
+   * const buf = new DynamicBuffer('ABC');
+   * console.log(buf.reverse().toString());
+   * // CBA
+   * console.log(buf.toString());
+   * // CBA
+   * ```
+   *
+   * @returns The reference to this buffer.
+   */
+  reverse(): DynamicBuffer {
+    if (!this.buffer || this.length === 0) {
+      return this;
+    }
+
+    this.buffer.subarray(0, this.length).reverse();
+
+    return this;
+  }
+
   /**
    * Write data into internal buffer with the specified offset.
    *

test/array.spec.ts

@@ -0,0 +1,22 @@
+import assert from 'assert';
+import { describe, it } from 'mocha';
+
+import { DynamicBuffer } from '../src';
+
+describe('Reverse tests', () => {
+  it('Reverse buffer', () => {
+    const buf = new DynamicBuffer('hello');
+    const ref = buf.reverse();
+
+    assert.equal(buf.toString(), 'olleh');
+    assert.equal(ref.toString(), 'olleh');
+  });
+
+  it('Reverse empty buffer', () => {
+    const buf = new DynamicBuffer();
+    const ref = buf.reverse();
+
+    assert.equal(buf.toString(), '');
+    assert.equal(ref.toString(), '');
+  });
+});