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shallow copy vs deep copy

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Excited Elk answered on August 22, 2020 Popularity 10/10 Helpfulness 3/10

answer shallow copy vs deep copy

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shallow copy vs deep copy

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FOR JAVASCRIPT:

	- Shallow Copy: 
        object2 = object1  

    - Deep Copy:
        object2 = {...object1}       //for arrays: array2 = [...array1]

    - Deep Copy (for Objects with nested Objects):
        object2 = JSON.parse(JSON.stringify(object1));

    - Deep Copy (for objects with nested 'Date object' OR functions):
        1- npm i loadash
        2- const _ = require('loadash');
        3- object2 = _.cloneDeep(object1);

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Tags: deep-copy javascript shallow-copy whatever

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Contributed on May 28 2022

Excited Elk

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/*

Search Results
Featured snippet from the web
A deep copy means that all of the values of the new variable
are copied and disconnected from the original variable. 
A shallow copy means that certain (sub-)values are still connected
to the original variable. To really understand copying,
you have to get into how JavaScript stores values


/*

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Source: www.freecodecamp.org

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Contributed on Aug 22 2020

our Supreme Lord and Savior

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shallow copy vs deep copy

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-1

from copy import copy, deepcopy

# Class of Car
class Car:
    def __init__(self, name, colors):
        self.name = name
        self.colors = colors
        
honda = Car("Honda", ["Red", "Blue"])
# Deepcopy of Honda
deepcopy_honda = deepcopy(honda)
deepcopy_honda.colors.append("Green")
print(deepcopy_honda.colors,honda.colors)
print(id(deepcopy_honda),id(honda))              #different address for main class
print(id(deepcopy_honda.colors),id(honda.colors))#different storage for attributes of the shallow copied class

# Shallow Copy of Honda
copy_honda = copy(honda)
copy_honda.colors.append("Green")
print(copy_honda.colors,honda.colors)
print(id(copy_honda),id(honda))                  #different address for main class
print(id(copy_honda.colors),id(honda.colors))    #same storage for attributes of the shallow copied class

#OUTPUTS
['Red', 'Blue', 'Green'] ['Red', 'Blue']
1909026397440 1909026397344
1908994536832 1908995605376
['Red', 'Blue', 'Green'] ['Red', 'Blue', 'Green']
1909026471312 1909026397344
1908995605376 1908995605376

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Tags: deep-copy deep

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Contributed on Jul 14 2022

Enthusiastic Echidna

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shallow copy vs deep copy

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