clone-deep-object.js

const { assign, cloneDeep } = require('lodash');

let obj = {
  type: {
    values: {
      results: [1, 2]
    }
  }
};
let copy;

// simple assignment => doesn't work
copy = obj;
copy
copy.type.values.results.push(3);
console.log(JSON.stringify(copy))
console.log(JSON.stringify(obj))

// spread => mutation => doesn't work
obj = {
  type: {
    values: {
      results: [1, 2]
    }
  }
};
copy = {
  ...obj
}
copy
copy.type.values.results.push(3);
console.log(JSON.stringify(copy))
console.log(JSON.stringify(obj))

// lodash assing => mutation => doesn't work
obj = {
  type: {
    values: {
      results: [1, 2]
    }
  }
};
copy = assign(obj, {});
copy
copy.type.values.results.push(3);
console.log(JSON.stringify(copy))
console.log(JSON.stringify(obj))

// cloneDeep => works
obj = {
  type: {
    values: {
      results: [1, 2]
    }
  }
};
copy = cloneDeep(obj);
copy
copy.type.values.results.push(3);
console.log(JSON.stringify(copy))
console.log(JSON.stringify(obj))