javascript - Arrays and Objects In Prototypes - Not Treated as References -

i have prototype object in javascript, when initialise new instance of prototype , update properties in prototype, updates elements. understand arrays , objects passed reference , wondering of solution around this?

let test = function () {}  test.prototype = {     array: [],     add: function (value) {         this.array.push(value)     } }  let test1 = new test(); let test2 = new test();  test1.add(1); test1.add(2);  // prints [1, 2] console.log(test2.array); 

one solution be:

class test {      constructor() {         this.array = []     }      add(value) {         this.array.push(value)     } }  let test1 = new test(); let test2 = new test();  test1.add(1); test1.add(2);  // prints [] console.log(test2.array); 

but not looking es6 approach, more "native" javascript.

thanks help!

that's thing: are treated references.

when this:

test.prototype = {     array: [], // <- creates new array , it's being used in instances     add: function (value) {         this.array.push(value)     } } 

what want getting different array instances different class instances. in case, this.array = [] in constructor:

let test = function () { this.array = []; } 

let test = function () { this.array = []; }    test.prototype = {      array: [],      add: function (value) {          this.array.push(value)      }  }    let test1 = new test();  let test2 = new test();    test1.add(1);  test1.add(2);    console.log(test1.array);  // => [1, 2]    console.log(test2.array);  // => []