Is this a valid/safe way to clone any object/function/etc. in ES6?












0














I'm wondering whether this is a safe approach to cloning a variable that could be anything:



// the original variable definition:

let varIWantToCopy = 'hello world'



// the clone variable's definition:

let {varIWantToCopy: cloneOfVarIWantToCopy} = {varIWantToCopy}



// mutating the original value:

varIWantToCopy = 'goodbye world'



// should log out 'hello world':

console.log(cloneOfVarIWantToCopy)


Thank you for taking the time to look this over.



Kind regards,



Harry






javascript variables ecmascript-6 clone immutability







share|improve this question


















  • 2




    No, because no clone or copy is made by that code. There is no native facility for a general-case "clone" or "copy" from an object because what that means is subjective.
    – Pointy
    Nov 14 '18 at 1:17












  • strings are immutable. You can just do let clone = varIWantToCopy and then you can modify clone without affecting varIWantToCopy
    – Doug Coburn
    Nov 14 '18 at 1:19
















0














I'm wondering whether this is a safe approach to cloning a variable that could be anything:



// the original variable definition:

let varIWantToCopy = 'hello world'



// the clone variable's definition:

let {varIWantToCopy: cloneOfVarIWantToCopy} = {varIWantToCopy}



// mutating the original value:

varIWantToCopy = 'goodbye world'



// should log out 'hello world':

console.log(cloneOfVarIWantToCopy)


Thank you for taking the time to look this over.



Kind regards,



Harry






javascript variables ecmascript-6 clone immutability







share|improve this question


















  • 2




    No, because no clone or copy is made by that code. There is no native facility for a general-case "clone" or "copy" from an object because what that means is subjective.
    – Pointy
    Nov 14 '18 at 1:17












  • strings are immutable. You can just do let clone = varIWantToCopy and then you can modify clone without affecting varIWantToCopy
    – Doug Coburn
    Nov 14 '18 at 1:19














0












0








0







I'm wondering whether this is a safe approach to cloning a variable that could be anything:



// the original variable definition:

let varIWantToCopy = 'hello world'



// the clone variable's definition:

let {varIWantToCopy: cloneOfVarIWantToCopy} = {varIWantToCopy}



// mutating the original value:

varIWantToCopy = 'goodbye world'



// should log out 'hello world':

console.log(cloneOfVarIWantToCopy)


Thank you for taking the time to look this over.



Kind regards,



Harry






javascript variables ecmascript-6 clone immutability







share|improve this question













I'm wondering whether this is a safe approach to cloning a variable that could be anything:



// the original variable definition:

let varIWantToCopy = 'hello world'



// the clone variable's definition:

let {varIWantToCopy: cloneOfVarIWantToCopy} = {varIWantToCopy}



// mutating the original value:

varIWantToCopy = 'goodbye world'



// should log out 'hello world':

console.log(cloneOfVarIWantToCopy)


Thank you for taking the time to look this over.



Kind regards,



Harry






javascript variables ecmascript-6 clone immutability




javascript variables ecmascript-6 clone immutability






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 14 '18 at 1:16









Harry Solovay

156




156








  • 2




    No, because no clone or copy is made by that code. There is no native facility for a general-case "clone" or "copy" from an object because what that means is subjective.
    – Pointy
    Nov 14 '18 at 1:17












  • strings are immutable. You can just do let clone = varIWantToCopy and then you can modify clone without affecting varIWantToCopy
    – Doug Coburn
    Nov 14 '18 at 1:19














  • 2




    No, because no clone or copy is made by that code. There is no native facility for a general-case "clone" or "copy" from an object because what that means is subjective.
    – Pointy
    Nov 14 '18 at 1:17












  • strings are immutable. You can just do let clone = varIWantToCopy and then you can modify clone without affecting varIWantToCopy
    – Doug Coburn
    Nov 14 '18 at 1:19








2




2




No, because no clone or copy is made by that code. There is no native facility for a general-case "clone" or "copy" from an object because what that means is subjective.
– Pointy
Nov 14 '18 at 1:17






No, because no clone or copy is made by that code. There is no native facility for a general-case "clone" or "copy" from an object because what that means is subjective.
– Pointy
Nov 14 '18 at 1:17














strings are immutable. You can just do let clone = varIWantToCopy and then you can modify clone without affecting varIWantToCopy
– Doug Coburn
Nov 14 '18 at 1:19




strings are immutable. You can just do let clone = varIWantToCopy and then you can modify clone without affecting varIWantToCopy
– Doug Coburn
Nov 14 '18 at 1:19












1 Answer
1






active

oldest

votes


















1














I think you should use lodash if you really want to clone an object.
There are several clone functions in lodash that you can use depending on your requirements.



// or you can use lodash/clone

import cloneDeep from 'lodash/cloneDeep';



var objects = [{ 'a': 1 }, { 'b': 2 }];



var cloned = cloneDeep(objects);



console.log(cloned[0] === objects[0]); // this will be false


So if you change the value of cloned[0], the value of object[0] won't change.






share|improve this answer























  • Thank you @xeiton! Would this work if a function was assigned to objects?
    – Harry Solovay
    Nov 14 '18 at 13:01










  • @HarrySolovay, I am not 100% sure, but my guess is that it should work with functions too, since functions are a type of object in JS. If this answer helped you please accept as an answer or up-vote, or both :P ... Thank you!
    – xeiton
    Nov 14 '18 at 22:28











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1 Answer
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1 Answer
1






active

oldest

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active

oldest

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active

oldest

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1














I think you should use lodash if you really want to clone an object.
There are several clone functions in lodash that you can use depending on your requirements.



// or you can use lodash/clone

import cloneDeep from 'lodash/cloneDeep';



var objects = [{ 'a': 1 }, { 'b': 2 }];



var cloned = cloneDeep(objects);



console.log(cloned[0] === objects[0]); // this will be false


So if you change the value of cloned[0], the value of object[0] won't change.






share|improve this answer























  • Thank you @xeiton! Would this work if a function was assigned to objects?
    – Harry Solovay
    Nov 14 '18 at 13:01










  • @HarrySolovay, I am not 100% sure, but my guess is that it should work with functions too, since functions are a type of object in JS. If this answer helped you please accept as an answer or up-vote, or both :P ... Thank you!
    – xeiton
    Nov 14 '18 at 22:28
















1














I think you should use lodash if you really want to clone an object.
There are several clone functions in lodash that you can use depending on your requirements.



// or you can use lodash/clone

import cloneDeep from 'lodash/cloneDeep';



var objects = [{ 'a': 1 }, { 'b': 2 }];



var cloned = cloneDeep(objects);



console.log(cloned[0] === objects[0]); // this will be false


So if you change the value of cloned[0], the value of object[0] won't change.






share|improve this answer























  • Thank you @xeiton! Would this work if a function was assigned to objects?
    – Harry Solovay
    Nov 14 '18 at 13:01










  • @HarrySolovay, I am not 100% sure, but my guess is that it should work with functions too, since functions are a type of object in JS. If this answer helped you please accept as an answer or up-vote, or both :P ... Thank you!
    – xeiton
    Nov 14 '18 at 22:28














1












1








1






I think you should use lodash if you really want to clone an object.
There are several clone functions in lodash that you can use depending on your requirements.



// or you can use lodash/clone

import cloneDeep from 'lodash/cloneDeep';



var objects = [{ 'a': 1 }, { 'b': 2 }];



var cloned = cloneDeep(objects);



console.log(cloned[0] === objects[0]); // this will be false


So if you change the value of cloned[0], the value of object[0] won't change.






share|improve this answer














I think you should use lodash if you really want to clone an object.
There are several clone functions in lodash that you can use depending on your requirements.



// or you can use lodash/clone

import cloneDeep from 'lodash/cloneDeep';



var objects = [{ 'a': 1 }, { 'b': 2 }];



var cloned = cloneDeep(objects);



console.log(cloned[0] === objects[0]); // this will be false


So if you change the value of cloned[0], the value of object[0] won't change.







share|improve this answer














share|improve this answer



share|improve this answer








edited Nov 16 '18 at 12:54

























answered Nov 14 '18 at 2:01









xeiton

2216




2216












  • Thank you @xeiton! Would this work if a function was assigned to objects?
    – Harry Solovay
    Nov 14 '18 at 13:01










  • @HarrySolovay, I am not 100% sure, but my guess is that it should work with functions too, since functions are a type of object in JS. If this answer helped you please accept as an answer or up-vote, or both :P ... Thank you!
    – xeiton
    Nov 14 '18 at 22:28


















  • Thank you @xeiton! Would this work if a function was assigned to objects?
    – Harry Solovay
    Nov 14 '18 at 13:01










  • @HarrySolovay, I am not 100% sure, but my guess is that it should work with functions too, since functions are a type of object in JS. If this answer helped you please accept as an answer or up-vote, or both :P ... Thank you!
    – xeiton
    Nov 14 '18 at 22:28
















Thank you @xeiton! Would this work if a function was assigned to objects?
– Harry Solovay
Nov 14 '18 at 13:01




Thank you @xeiton! Would this work if a function was assigned to objects?
– Harry Solovay
Nov 14 '18 at 13:01












@HarrySolovay, I am not 100% sure, but my guess is that it should work with functions too, since functions are a type of object in JS. If this answer helped you please accept as an answer or up-vote, or both :P ... Thank you!
– xeiton
Nov 14 '18 at 22:28




@HarrySolovay, I am not 100% sure, but my guess is that it should work with functions too, since functions are a type of object in JS. If this answer helped you please accept as an answer or up-vote, or both :P ... Thank you!
– xeiton
Nov 14 '18 at 22:28


















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