js clone object deep code example

Example 1: deep clone object javascript

JSON.parse(JSON.stringify(object))

Example 2: deep clone javascript object

const deepCopyFunction = (inObject) => {
  let outObject, value, key

  if (typeof inObject !== "object" || inObject === null) {
    return inObject // Return the value if inObject is not an object
  }

  // Create an array or object to hold the values
  outObject = Array.isArray(inObject) ? [] : {}

  for (key in inObject) {
    value = inObject[key]

    // Recursively (deep) copy for nested objects, including arrays
    outObject[key] = deepCopyFunction(value)
  }

  return outObject
}

Example 3: how to deep copy an object in javascript

const obj1 = { a: 1, b: 2, c: 3 };
// this converts the object to string so there will be no reference from 
// this first object
const s = JSON.stringify(obj1);

const obj2 = JSON.parse(s);

Example 4: deep copy js

//recursive deep copy of object
function dup(o) {
    // "string", number, boolean
    if(typeof(o) != "object") {
        return o;
    }
    
     // null
    if(!o) {
        return o; // null
    }
    
    var r = (o instanceof Array) ? [] : {};
    for(var i in o) {
        if(o.hasOwnProperty(i)) {
            r[i] = dup(o[i]);
        }
    }
    return r;
}