Question

How to flatten nested array in JavaScript

Answer 1

let arr = [1, 2, 5, [8, 9], [3, 4, 6]];

arr = arr.flat();
  
console.log(arr); 


      
    
/*
run:
    
[1, 2, 5, 8, 9, 3, 4, 6]
    
*/

 

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Answer 2

let arr = [1, 2, 5, [8, 9, [3, 4, 6]]];

arr = arr.flat(2);
  
console.log(arr); 


      
    
/*
run:
    
[1, 2, 5, 8, 9, 3, 4, 6]
    
*/

 

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