34 lines
1.2 KiB
Markdown
34 lines
1.2 KiB
Markdown
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---
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title: Catch Unclosed Parentheses, Brackets, Braces and Quotes
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localeTitle: 抓住未封闭的圆括号，括号，括号和引号
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---
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## 抓住未封闭的圆括号，括号，括号和引号
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reduce（）方法将数组减少为单个值。如果您不熟悉它，以下代码显示了使用该方法的示例：
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```
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const array1 = [1, 2, 3, 4];
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console.log(array1.reduce((accumulator, currentValue) => accumulator + currentValue)); // expected output: 10
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```
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您还可以将reduce方法的参数定义为变量或常量，并将其移交给函数，例如，
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```
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const array1 = [1, 2, 3, 4];
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const reducer = (accumulator, currentValue) => accumulator + currentValue;
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// 1 + 2 + 3 + 4
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console.log(array1.reduce(reducer)); // expected output: 10
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// 5 + 1 + 2 + 3 + 4
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console.log(array1.reduce(reducer, 5)); // expected output: 15
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```
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您可以在[Array.prototype.reduce（）中](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce)查看并运行此代码。
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## 解：
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```javascript
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let myArray = [1, 2, 3];
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let arraySum = myArray.reduce((previous, current) => previous + current);
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console.log(`Sum of array values is: ${arraySum}`);
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```
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