Question

How to loop through an array backward in JavaScript

Answer 1

const arr = [4, 8, 1, 0, 9, 7];
 
for (let i = arr.length - 1; i >= 0; i--) {
    console.log(arr[i]);
}

   
        
        
/*
run:
        
7
9
0
1
8
4
        
*/

 

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Answer 2

const arr = [4, 8, 1, 0, 9, 7];
 
arr.slice().reverse()
   .forEach(function(item) {
            console.log(item);
        });

   
        
        
/*
run:
        
7
9
0
1
8
4
        
*/

 

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Answer 3

const arr = [4, 8, 1, 0, 9, 7];
 
arr.reduceRight((_, item) => console.log(item), null);

   
        
        
/*
run:
        
7
9
0
1
8
4
        
*/

 

70+ SQL courses for beginners and professionals