Question

How to cyclically rotate the elements of int array left by one in JavaScript

Answer 1

function rotate_left_by_one(arr) {
    const arr_size = arr.length;
    const first = arr[0];
    
	for (let i = 0; i < arr_size - 1; i++) {
     	arr[i] = arr[i + 1];
	}
      
	arr[arr_size - 1] = first;
}

let arr = [4, 7, 2, 9, 3];

rotate_left_by_one(arr);
  
console.log(arr);
  
    
      
      
/*
run:
      
[7, 2, 9, 3, 4]
      
*/

 

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