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How to use reduceRight function

不言Original: 2019-02-21 13:29:262432browse

array.reduceright() is a built-in function in javascript that converts the elements of a given array from right to left into a single value. So let's take a look at the specific use of the reduceRight function.

Let’s take a look at the basic syntax of the reduceRight function

array.reduceRight(previousValue, currentValue)

The two parameters previousValue and currentValue represent the previous sum of the given input array The current element.

Let’s look at two specific examples

Example 1:

The code is as follows

<!DOCTYPE html>
<html>
<head>
  <title></title>
</head>
<body>
<script> 
  
const A = [ [ 1, 2, 3 ], [ 4, 5, 6 ], [ 7, 8 ] ]; 
  
a = A.reduceRight((previousValue, currentValue) => previousValue.concat(currentValue)); 

document.write(a); 
  
</script> 
</body>
</html>

The output result is: 7,8,4,5 ,6,1,2,3

Example 2:

The code is as follows

<!DOCTYPE html>
<html>
<head>
  <title></title>
</head>
<body>
<script> 
const A = [ [ 1, 2, 3 ], [ "a", "b", "c" ], [ 7, 8 ] ]; 
a = A.reduceRight((previousValue, currentValue) => previousValue.concat(currentValue)); 
document.write(a); 
  
</script>
</body>
</html>

The output result is: 7,8,a,b,c,1,2, 3

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