given an integer array (of length n), find and return all the subsets of input array. code example

Example: find all subsets of an array javascript

const getAllSubsets = 
      theArray => theArray.reduce(
        (subsets, value) => subsets.concat(
         subsets.map(set => [value,...set])
        ),
        [[]]
      );

console.log(getAllSubsets([1,2,3]));