freeCodeCamp/guide/chinese/certifications/javascript-algorithms-and-data-structures/debugging/catch-unclosed-parentheses-brackets-braces-and-quotes/index.md

title	localeTitle
Catch Unclosed Parentheses, Brackets, Braces and Quotes	抓住未封闭的圆括号，括号，括号和引号

抓住未封闭的圆括号，括号，括号和引号

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：

const array1 = [1, 2, 3, 4]; 
 console.log(array1.reduce((accumulator, currentValue) => accumulator + currentValue));  // expected output: 10 

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，

const array1 = [1, 2, 3, 4]; 
 const reducer = (accumulator, currentValue) => accumulator + currentValue; 
 
 // 1 + 2 + 3 + 4 
 console.log(array1.reduce(reducer));      // expected output: 10 
 
 // 5 + 1 + 2 + 3 + 4 
 console.log(array1.reduce(reducer, 5));   // expected output: 15 

您可以在Array.prototype.reduce（）中查看并运行此代码。

解：

let myArray = [1, 2, 3]; 
 let arraySum = myArray.reduce((previous, current) =>  previous + current); 
 console.log(`Sum of array values is: ${arraySum}`);