JavaScript deep copy an array containing nested objects, arrays & functions?
I have an array structured like this and I'm trying to get a copy of it (to modify and use for React setState()). In Python I can use copy.deepcopy() but I can't find an easy way to do this in JavaScript.
notes=[
{
contents: "Hello World 1",
function: console.log,
children: [
{
contents: "Hello World A",
function: console.log,
children:
},
]
},
{
contents: "Hello World 2",
function: console.log,
children:
}
]
I found this article and similar solutions on stackoverflow, but none of them work for me.
https://medium.com/@Farzad_YZ/3-ways-to-clone-objects-in-javascript-f752d148054d
Two solutions are only a shallow copy, and JSON.parse doesn't work on functions.
I'd like to have a function that can deep copy any array or object containing any arbitrary structure of nested JavaScript datatypes.
I'd rather not reinvent the wheel writing a complex recursive function to traverse and clone everything, is there any existing solution?
javascript arrays json copy deep-copy
add a comment |
I have an array structured like this and I'm trying to get a copy of it (to modify and use for React setState()). In Python I can use copy.deepcopy() but I can't find an easy way to do this in JavaScript.
notes=[
{
contents: "Hello World 1",
function: console.log,
children: [
{
contents: "Hello World A",
function: console.log,
children:
},
]
},
{
contents: "Hello World 2",
function: console.log,
children:
}
]
I found this article and similar solutions on stackoverflow, but none of them work for me.
https://medium.com/@Farzad_YZ/3-ways-to-clone-objects-in-javascript-f752d148054d
Two solutions are only a shallow copy, and JSON.parse doesn't work on functions.
I'd like to have a function that can deep copy any array or object containing any arbitrary structure of nested JavaScript datatypes.
I'd rather not reinvent the wheel writing a complex recursive function to traverse and clone everything, is there any existing solution?
javascript arrays json copy deep-copy
add a comment |
I have an array structured like this and I'm trying to get a copy of it (to modify and use for React setState()). In Python I can use copy.deepcopy() but I can't find an easy way to do this in JavaScript.
notes=[
{
contents: "Hello World 1",
function: console.log,
children: [
{
contents: "Hello World A",
function: console.log,
children:
},
]
},
{
contents: "Hello World 2",
function: console.log,
children:
}
]
I found this article and similar solutions on stackoverflow, but none of them work for me.
https://medium.com/@Farzad_YZ/3-ways-to-clone-objects-in-javascript-f752d148054d
Two solutions are only a shallow copy, and JSON.parse doesn't work on functions.
I'd like to have a function that can deep copy any array or object containing any arbitrary structure of nested JavaScript datatypes.
I'd rather not reinvent the wheel writing a complex recursive function to traverse and clone everything, is there any existing solution?
javascript arrays json copy deep-copy
I have an array structured like this and I'm trying to get a copy of it (to modify and use for React setState()). In Python I can use copy.deepcopy() but I can't find an easy way to do this in JavaScript.
notes=[
{
contents: "Hello World 1",
function: console.log,
children: [
{
contents: "Hello World A",
function: console.log,
children:
},
]
},
{
contents: "Hello World 2",
function: console.log,
children:
}
]
I found this article and similar solutions on stackoverflow, but none of them work for me.
https://medium.com/@Farzad_YZ/3-ways-to-clone-objects-in-javascript-f752d148054d
Two solutions are only a shallow copy, and JSON.parse doesn't work on functions.
I'd like to have a function that can deep copy any array or object containing any arbitrary structure of nested JavaScript datatypes.
I'd rather not reinvent the wheel writing a complex recursive function to traverse and clone everything, is there any existing solution?
javascript arrays json copy deep-copy
javascript arrays json copy deep-copy
edited Nov 13 '18 at 3:29
asked Nov 13 '18 at 3:10
Esostack
3841315
3841315
add a comment |
add a comment |
3 Answers
3
active
oldest
votes
I'm answering my own question with the solution I found. Someone posted this in the comment section of the article I linked and it seems to work
notes=[
{
contents: "Hello World 1",
function: console.log,
children: [
{
contents: "Hello World A",
function: console.log,
children:
},
]
},
{
contents: "Hello World 2",
function: console.log,
children:
}
]
function deepCopy(src) {
let target = Array.isArray(src) ? : {};
for (let key in src) {
let v = src[key];
if (v) {
if (typeof v === "object") {
target[key] = deepCopy(v);
} else {
target[key] = v;
}
} else {
target[key] = v;
}
}
return target;
}
This doesn't clone functions...
– hev1
Nov 13 '18 at 3:38
See my answer below... One line solution...const copy = notes.map(a => ({ ...a }));
– SakoBu
Nov 13 '18 at 3:42
@hev1 What do you mean it doesn't clone functions? It works for me screencast.com/t/WWaBe9Rloe
– Esostack
Nov 13 '18 at 3:52
add a comment |
shortest way if you can not find better answer
var note2 = JSON.parse(JSON.stringify(notes))
but it didnt copy functions
so check
function iterationCopy(src) {
let target = {};
for (let prop in src) {
if (src.hasOwnProperty(prop)) {
target[prop] = src[prop];
}
}
return target;
}
const source = {a:1, b:2, c:3};
const target = iterationCopy(source);
console.log(target); // {a:1, b:2, c:3}
// Check if clones it and not changing it
source.a = 'a';
console.log(source.a); // 'a'
console.log(target.a); // 1
and
function bestCopyEver(src) {
return Object.assign({}, src);
}
const source = {a:1, b:2, c:3};
const target = bestCopyEver(source);
console.log(target); // {a:1, b:2, c:3}
// Check if clones it and not changing it
source.a = 'a';
console.log(source.a); // 'a'
console.log(target.a); // 1
from Deep copy using iteration
add a comment |
you should use for loop iterate it and judge item type, when it is object type, use recursion. the function like:
function copy(obj1, obj2) {
var obj2=obj2||{};
for(var name in obj1) {
if(typeof obj1[name] === "object") {
obj2[name]= (obj1[name].constructor===Array)?:{};
copy(obj1[name],obj2[name]);
} else {
obj2[name]=obj1[name];
}
}
return obj2;
}
add a comment |
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
I'm answering my own question with the solution I found. Someone posted this in the comment section of the article I linked and it seems to work
notes=[
{
contents: "Hello World 1",
function: console.log,
children: [
{
contents: "Hello World A",
function: console.log,
children:
},
]
},
{
contents: "Hello World 2",
function: console.log,
children:
}
]
function deepCopy(src) {
let target = Array.isArray(src) ? : {};
for (let key in src) {
let v = src[key];
if (v) {
if (typeof v === "object") {
target[key] = deepCopy(v);
} else {
target[key] = v;
}
} else {
target[key] = v;
}
}
return target;
}
This doesn't clone functions...
– hev1
Nov 13 '18 at 3:38
See my answer below... One line solution...const copy = notes.map(a => ({ ...a }));
– SakoBu
Nov 13 '18 at 3:42
@hev1 What do you mean it doesn't clone functions? It works for me screencast.com/t/WWaBe9Rloe
– Esostack
Nov 13 '18 at 3:52
add a comment |
I'm answering my own question with the solution I found. Someone posted this in the comment section of the article I linked and it seems to work
notes=[
{
contents: "Hello World 1",
function: console.log,
children: [
{
contents: "Hello World A",
function: console.log,
children:
},
]
},
{
contents: "Hello World 2",
function: console.log,
children:
}
]
function deepCopy(src) {
let target = Array.isArray(src) ? : {};
for (let key in src) {
let v = src[key];
if (v) {
if (typeof v === "object") {
target[key] = deepCopy(v);
} else {
target[key] = v;
}
} else {
target[key] = v;
}
}
return target;
}
This doesn't clone functions...
– hev1
Nov 13 '18 at 3:38
See my answer below... One line solution...const copy = notes.map(a => ({ ...a }));
– SakoBu
Nov 13 '18 at 3:42
@hev1 What do you mean it doesn't clone functions? It works for me screencast.com/t/WWaBe9Rloe
– Esostack
Nov 13 '18 at 3:52
add a comment |
I'm answering my own question with the solution I found. Someone posted this in the comment section of the article I linked and it seems to work
notes=[
{
contents: "Hello World 1",
function: console.log,
children: [
{
contents: "Hello World A",
function: console.log,
children:
},
]
},
{
contents: "Hello World 2",
function: console.log,
children:
}
]
function deepCopy(src) {
let target = Array.isArray(src) ? : {};
for (let key in src) {
let v = src[key];
if (v) {
if (typeof v === "object") {
target[key] = deepCopy(v);
} else {
target[key] = v;
}
} else {
target[key] = v;
}
}
return target;
}
I'm answering my own question with the solution I found. Someone posted this in the comment section of the article I linked and it seems to work
notes=[
{
contents: "Hello World 1",
function: console.log,
children: [
{
contents: "Hello World A",
function: console.log,
children:
},
]
},
{
contents: "Hello World 2",
function: console.log,
children:
}
]
function deepCopy(src) {
let target = Array.isArray(src) ? : {};
for (let key in src) {
let v = src[key];
if (v) {
if (typeof v === "object") {
target[key] = deepCopy(v);
} else {
target[key] = v;
}
} else {
target[key] = v;
}
}
return target;
}
edited Nov 13 '18 at 3:48
answered Nov 13 '18 at 3:28
Esostack
3841315
3841315
This doesn't clone functions...
– hev1
Nov 13 '18 at 3:38
See my answer below... One line solution...const copy = notes.map(a => ({ ...a }));
– SakoBu
Nov 13 '18 at 3:42
@hev1 What do you mean it doesn't clone functions? It works for me screencast.com/t/WWaBe9Rloe
– Esostack
Nov 13 '18 at 3:52
add a comment |
This doesn't clone functions...
– hev1
Nov 13 '18 at 3:38
See my answer below... One line solution...const copy = notes.map(a => ({ ...a }));
– SakoBu
Nov 13 '18 at 3:42
@hev1 What do you mean it doesn't clone functions? It works for me screencast.com/t/WWaBe9Rloe
– Esostack
Nov 13 '18 at 3:52
This doesn't clone functions...
– hev1
Nov 13 '18 at 3:38
This doesn't clone functions...
– hev1
Nov 13 '18 at 3:38
See my answer below... One line solution...
const copy = notes.map(a => ({ ...a }));
– SakoBu
Nov 13 '18 at 3:42
See my answer below... One line solution...
const copy = notes.map(a => ({ ...a }));
– SakoBu
Nov 13 '18 at 3:42
@hev1 What do you mean it doesn't clone functions? It works for me screencast.com/t/WWaBe9Rloe
– Esostack
Nov 13 '18 at 3:52
@hev1 What do you mean it doesn't clone functions? It works for me screencast.com/t/WWaBe9Rloe
– Esostack
Nov 13 '18 at 3:52
add a comment |
shortest way if you can not find better answer
var note2 = JSON.parse(JSON.stringify(notes))
but it didnt copy functions
so check
function iterationCopy(src) {
let target = {};
for (let prop in src) {
if (src.hasOwnProperty(prop)) {
target[prop] = src[prop];
}
}
return target;
}
const source = {a:1, b:2, c:3};
const target = iterationCopy(source);
console.log(target); // {a:1, b:2, c:3}
// Check if clones it and not changing it
source.a = 'a';
console.log(source.a); // 'a'
console.log(target.a); // 1
and
function bestCopyEver(src) {
return Object.assign({}, src);
}
const source = {a:1, b:2, c:3};
const target = bestCopyEver(source);
console.log(target); // {a:1, b:2, c:3}
// Check if clones it and not changing it
source.a = 'a';
console.log(source.a); // 'a'
console.log(target.a); // 1
from Deep copy using iteration
add a comment |
shortest way if you can not find better answer
var note2 = JSON.parse(JSON.stringify(notes))
but it didnt copy functions
so check
function iterationCopy(src) {
let target = {};
for (let prop in src) {
if (src.hasOwnProperty(prop)) {
target[prop] = src[prop];
}
}
return target;
}
const source = {a:1, b:2, c:3};
const target = iterationCopy(source);
console.log(target); // {a:1, b:2, c:3}
// Check if clones it and not changing it
source.a = 'a';
console.log(source.a); // 'a'
console.log(target.a); // 1
and
function bestCopyEver(src) {
return Object.assign({}, src);
}
const source = {a:1, b:2, c:3};
const target = bestCopyEver(source);
console.log(target); // {a:1, b:2, c:3}
// Check if clones it and not changing it
source.a = 'a';
console.log(source.a); // 'a'
console.log(target.a); // 1
from Deep copy using iteration
add a comment |
shortest way if you can not find better answer
var note2 = JSON.parse(JSON.stringify(notes))
but it didnt copy functions
so check
function iterationCopy(src) {
let target = {};
for (let prop in src) {
if (src.hasOwnProperty(prop)) {
target[prop] = src[prop];
}
}
return target;
}
const source = {a:1, b:2, c:3};
const target = iterationCopy(source);
console.log(target); // {a:1, b:2, c:3}
// Check if clones it and not changing it
source.a = 'a';
console.log(source.a); // 'a'
console.log(target.a); // 1
and
function bestCopyEver(src) {
return Object.assign({}, src);
}
const source = {a:1, b:2, c:3};
const target = bestCopyEver(source);
console.log(target); // {a:1, b:2, c:3}
// Check if clones it and not changing it
source.a = 'a';
console.log(source.a); // 'a'
console.log(target.a); // 1
from Deep copy using iteration
shortest way if you can not find better answer
var note2 = JSON.parse(JSON.stringify(notes))
but it didnt copy functions
so check
function iterationCopy(src) {
let target = {};
for (let prop in src) {
if (src.hasOwnProperty(prop)) {
target[prop] = src[prop];
}
}
return target;
}
const source = {a:1, b:2, c:3};
const target = iterationCopy(source);
console.log(target); // {a:1, b:2, c:3}
// Check if clones it and not changing it
source.a = 'a';
console.log(source.a); // 'a'
console.log(target.a); // 1
and
function bestCopyEver(src) {
return Object.assign({}, src);
}
const source = {a:1, b:2, c:3};
const target = bestCopyEver(source);
console.log(target); // {a:1, b:2, c:3}
// Check if clones it and not changing it
source.a = 'a';
console.log(source.a); // 'a'
console.log(target.a); // 1
from Deep copy using iteration
answered Nov 13 '18 at 3:30
hossein sedighian
4816
4816
add a comment |
add a comment |
you should use for loop iterate it and judge item type, when it is object type, use recursion. the function like:
function copy(obj1, obj2) {
var obj2=obj2||{};
for(var name in obj1) {
if(typeof obj1[name] === "object") {
obj2[name]= (obj1[name].constructor===Array)?:{};
copy(obj1[name],obj2[name]);
} else {
obj2[name]=obj1[name];
}
}
return obj2;
}
add a comment |
you should use for loop iterate it and judge item type, when it is object type, use recursion. the function like:
function copy(obj1, obj2) {
var obj2=obj2||{};
for(var name in obj1) {
if(typeof obj1[name] === "object") {
obj2[name]= (obj1[name].constructor===Array)?:{};
copy(obj1[name],obj2[name]);
} else {
obj2[name]=obj1[name];
}
}
return obj2;
}
add a comment |
you should use for loop iterate it and judge item type, when it is object type, use recursion. the function like:
function copy(obj1, obj2) {
var obj2=obj2||{};
for(var name in obj1) {
if(typeof obj1[name] === "object") {
obj2[name]= (obj1[name].constructor===Array)?:{};
copy(obj1[name],obj2[name]);
} else {
obj2[name]=obj1[name];
}
}
return obj2;
}
you should use for loop iterate it and judge item type, when it is object type, use recursion. the function like:
function copy(obj1, obj2) {
var obj2=obj2||{};
for(var name in obj1) {
if(typeof obj1[name] === "object") {
obj2[name]= (obj1[name].constructor===Array)?:{};
copy(obj1[name],obj2[name]);
} else {
obj2[name]=obj1[name];
}
}
return obj2;
}
answered Nov 13 '18 at 3:36
echoLC
1
1
add a comment |
add a comment |
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