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+# 목차
+
+1. **[폴리필](#폴리필)**
+
+---
+
+## 폴리필
+
+[폴리필 링크](https://github.com/tc39/proposal-object-values-entries/blob/main/polyfill.js)
+
+아래 네 개의 문법이 선행되어야 합니다.
+- `Array.prototype.reduce`
+- `Object.prototype.propertyIsEnumerable`
+- `Array.prototype.concat`
+- `Reflect.ownKeys`
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