Array, string de duplication

Array weight removal

Method 1 ：
Extension operators and Set The combination of structure , You can remove duplicate members of the array .

//  Remove duplicate members of the array 
[...new Set(array)]

let arr = [3, 5, 2, 2, 5, 5];
let unique = [...new Set(arr)];
// [3, 5, 2]

Method 2 ：
Array.from Method can Set Structure to array .

const items = new Set([1, 2, 3, 4, 5]);
const array = Array.from(items);

This provides another way to remove duplicate members of an array .

function dedupe(array) {
    
  return Array.from(new Set(array));
}

dedupe([1, 1, 2, 3]) // [1, 2, 3]

String de duplication

Remove duplicate characters from the string .

[...new Set('ababbc')].join('')
// "abc"