JS - clone array of objects and deep clone

 for array of objects of 1 level best to use 

https://stackoverflow.com/questions/597588/how-do-you-clone-an-array-of-objects-in-javascript

clonedArray = nodesArray.map(a => {return {...a}})

For multiple depth

best to use 

let clonedArray = JSON.parse(JSON.stringify(nodesArray))

note: do not use JSON.pares(..JSON.stringify) for 1 level as JSON.stringify will return {} for some cases :

https://medium.com/@pmzubar/why-json-parse-json-stringify-is-a-bad-practice-to-clone-an-object-in-javascript-b28ac5e36521

JSON.stringify({ key: undefined });
JSON.stringify({ key: Symbol() });
JSON.stringify({ key: function(){} });// all will be converted to just "{}"

deep clone function :

https://stackoverflow.com/questions/597588/how-do-you-clone-an-array-of-objects-in-javascript

function deepClone (item) {
  if (Array.isArray(item)) {
    var newArr = [];
    for (var i = item.length; i-- > 0;) {
      newArr[i] = deepClone(item[i]);
    }
    return newArr;
  }
  if (typeof item === 'function' && !(/\(\) \{ \[native/).test(item.toString())) {
    var obj;
    eval('obj = '+ item.toString());
    for (var k in item) {
      obj[k] = deepClone(item[k]);
    }
    return obj;
  }
  if (item && typeof item === 'object') {
    var obj = {};
    for (var k in item) {
      obj[k] = deepClone(item[k]);
    }
    return obj;
  }
  return item;
}