add: Color contrast snippet

public/data/javascript.json

@@ -355,7 +355,33 @@
         ],
         "tags": ["javascript", "utility", "throttle", "performance"],
         "author": "dostonnabotov"
-      }
+      },
+     {
+  "title": "Get Contrast Color",
+  "description": "Returns either black or white text color based on the brightness of the provided hex color.",
+  "code": [
+    "const getContrastColor = (hexColor) => {",
+    "  // Expand short hex color to full format",
+    "  if (hexColor.length === 4) {",
+    "    hexColor = `#${hexColor[1]}${hexColor[1]}${hexColor[2]}${hexColor[2]}${hexColor[3]}${hexColor[3]}`;",
+    "  }",
+    "  const r = parseInt(hexColor.slice(1, 3), 16);",
+    "  const g = parseInt(hexColor.slice(3, 5), 16);",
+    "  const b = parseInt(hexColor.slice(5, 7), 16);",
+    "  const brightness = (r * 299 + g * 587 + b * 114) / 1000;",
+    "  return brightness >= 128 ? \"#000000\" : \"#FFFFFF\";",
+    "};",
+    "",
+    "// Usage:",
+    "console.log(getContrastColor('#fff')); // Output: #000000 (black)",
+    "console.log(getContrastColor('#123456')); // Output: #FFFFFF (white)",
+    "console.log(getContrastColor('#ff6347')); // Output: #000000 (black)",
+    "console.log(getContrastColor('#f4f')); // Output: #000000 (black)"
+  ],
+  "tags": ["color", "hex", "contrast", "brightness", "utility"],
+  "author": "yaya12085"
+}
+
     ]
   },
   {