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

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

asked Nov 14 '18 at 1:16

Harry Solovay

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

add a comment |

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

asked Nov 14 '18 at 1:16

Harry Solovay

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

add a comment |

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

asked Nov 14 '18 at 1:16

Harry Solovay

156

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

asked Nov 14 '18 at 1:16

Harry Solovay

156

asked Nov 14 '18 at 1:16

Harry Solovay

156

asked Nov 14 '18 at 1:16

Harry Solovay

156

asked Nov 14 '18 at 1:16

Harry Solovay

156

asked Nov 14 '18 at 1:16

Harry Solovay

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

add a comment |

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

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

add a comment |

1 Answer
1

active

oldest

votes

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.

edited Nov 16 '18 at 12:54

answered Nov 14 '18 at 2:01

xeiton

2666

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

add a comment |

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1 Answer
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1 Answer
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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.

edited Nov 16 '18 at 12:54

answered Nov 14 '18 at 2:01

xeiton

2666

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

add a comment |

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.

edited Nov 16 '18 at 12:54

answered Nov 14 '18 at 2:01

xeiton

2666

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

add a comment |

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.

edited Nov 16 '18 at 12:54

answered Nov 14 '18 at 2:01

xeiton

2666

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.

edited Nov 16 '18 at 12:54

answered Nov 14 '18 at 2:01

xeiton

2666

edited Nov 16 '18 at 12:54

answered Nov 14 '18 at 2:01

xeiton

2666

answered Nov 14 '18 at 2:01

xeiton

2666

answered Nov 14 '18 at 2:01

xeiton

2666

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

add a comment |

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

add a comment |

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