freeCodeCamp/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/deepcopy.english.md

title	id	challengeType
Deepcopy	596a8888ab7c01048de257d5	5

Description

Write a function that returns a deep copy of a given object. The copy must not be the same object that was given. This task will not test for:

• Objects with properties that are functions
• Date objects or object with properties that are Date objects
• RegEx or object with properties that are RegEx objects
• Prototype copying

Instructions

Tests

tests:
  - text: <code>deepcopy</code> should be a function.
    testString: assert(typeof deepcopy === 'function', '<code>deepcopy</code> should be a function.');
  - text: '<code>deepcopy({test: "test"})</code> should return an object.'
    testString: 'assert(typeof deepcopy(obj1) === ''object'', ''<code>deepcopy({test: "test"})</code> should return an object.'');'
  - text: Should not return the same object that was provided.
    testString: assert(deepcopy(obj2) != obj2, 'Should not return the same object that was provided.');
  - text: When passed an object containing an array, should return a deep copy of the object.
    testString: assert.deepEqual(deepcopy(obj2), obj2, 'When passed an object containing an array, should return a deep copy of the object.');
  - text: When passed an object containing another object, should return a deep copy of the object.
    testString: assert.deepEqual(deepcopy(obj3), obj3, 'When passed an object containing another object, should return a deep copy of the object.');

Challenge Seed

function deepcopy(obj) {
  // Good luck!
  return true;
}

After Test

const obj1 = { test: 'test' };
const obj2 = {
  t: 'test',
  a: ['an', 'array']
};
const obj3 = {
  t: 'try',
  o: obj2
};

Solution

function deepcopy(obj) {
  return JSON.parse(JSON.stringify(obj));
}