34 lines
1.1 KiB
Markdown
34 lines
1.1 KiB
Markdown
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---
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title: Catch Unclosed Parentheses, Brackets, Braces and Quotes
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---
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## Catch Unclosed Parentheses, Brackets, Braces and Quotes
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The reduce() method reduces an array to a single value. If you're not familiar with it, the following code shows an example of using the the method:
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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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You can also define the argument to the reduce method as a variable or constant and hand that in to the function, e.g.,
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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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You can see and run this code at [Array.prototype.reduce()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce).
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## Solution:
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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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