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### 8. 运算符优先级 https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/Operator_Precedence

### 9. 一行代码实现数组求和 ```js var a = [1, 2, 3, 4, 5]; a.reduce((a, b) => a + b) ```

@noordawod I will be as soon

@noordawod https://github.com/jindada/blog/issues/12