Using immutability-helper, how to set the property of an instance of a class without cloning other fields?
0
Here is an example:
class ExampleClass {
private x: number;
private ary: number;
constructor(x, ary = ) {
this.x = x;
this.ary = ary;
}
public getX() {
return this.x;
}
public setX(x) {
this.x = x;
}
}
const elemArray = [new ExampleClass(10, [10, 20]), new ExampleClass(20, [20, 30])];
I want to set the elemArray's second element's x to 30 using the setX function. The simplest way would be:
const newElemArray = update(elemArray, {1: {$apply: function (x: ExampleClass) {
const y = _.cloneDeep(x);
y.setX(30);
return y;
}}});
But I want to be able to do this without cloning the array ary, since that can itself be large and cloning maybe costly. How can I do this?
Thanks
javascript reactjs typescript redux immutability-helper
asked Jan 2 at 9:12
Sagar B HathwarSagar B Hathwar
301111
add a comment |
0
Here is an example:
class ExampleClass {
private x: number;
private ary: number;
constructor(x, ary = ) {
this.x = x;
this.ary = ary;
}
public getX() {
return this.x;
}
public setX(x) {
this.x = x;
}
}
const elemArray = [new ExampleClass(10, [10, 20]), new ExampleClass(20, [20, 30])];
I want to set the elemArray's second element's x to 30 using the setX function. The simplest way would be:
const newElemArray = update(elemArray, {1: {$apply: function (x: ExampleClass) {
const y = _.cloneDeep(x);
y.setX(30);
return y;
}}});
But I want to be able to do this without cloning the array ary, since that can itself be large and cloning maybe costly. How can I do this?
Thanks
javascript reactjs typescript redux immutability-helper
asked Jan 2 at 9:12
Sagar B HathwarSagar B Hathwar
301111
I think the idea behind immutability is that you can’t alter an object from outside it’s own scope. It seems you are jumping through hoops to get around this, but then why are you using an immutability library?
– Kokodoko
Jan 2 at 9:23
I have an array in redux store, an array of instances. Rather than cloning the entire array, I want to be able to change one field of one item of the array. Any simpler suggestion(not using an immutability library, perhaps?) is welcome
– Sagar B Hathwar
Jan 2 at 9:43
add a comment |
0
0
0
Here is an example:
class ExampleClass {
private x: number;
private ary: number;
constructor(x, ary = ) {
this.x = x;
this.ary = ary;
}
public getX() {
return this.x;
}
public setX(x) {
this.x = x;
}
}
const elemArray = [new ExampleClass(10, [10, 20]), new ExampleClass(20, [20, 30])];
I want to set the elemArray's second element's x to 30 using the setX function. The simplest way would be:
const newElemArray = update(elemArray, {1: {$apply: function (x: ExampleClass) {
const y = _.cloneDeep(x);
y.setX(30);
return y;
}}});
But I want to be able to do this without cloning the array ary, since that can itself be large and cloning maybe costly. How can I do this?
Thanks
javascript reactjs typescript redux immutability-helper
asked Jan 2 at 9:12
Sagar B HathwarSagar B Hathwar
301111
Here is an example:
class ExampleClass {
private x: number;
private ary: number;
constructor(x, ary = ) {
this.x = x;
this.ary = ary;
}
public getX() {
return this.x;
}
public setX(x) {
this.x = x;
}
}
const elemArray = [new ExampleClass(10, [10, 20]), new ExampleClass(20, [20, 30])];
I want to set the elemArray's second element's x to 30 using the setX function. The simplest way would be:
const newElemArray = update(elemArray, {1: {$apply: function (x: ExampleClass) {
const y = _.cloneDeep(x);
y.setX(30);
return y;
}}});
But I want to be able to do this without cloning the array ary, since that can itself be large and cloning maybe costly. How can I do this?
Thanks
javascript reactjs typescript redux immutability-helper
javascript reactjs typescript redux immutability-helper
asked Jan 2 at 9:12
Sagar B HathwarSagar B Hathwar
301111
asked Jan 2 at 9:12
Sagar B HathwarSagar B Hathwar
301111
asked Jan 2 at 9:12
Sagar B HathwarSagar B Hathwar
301111
asked Jan 2 at 9:12
Sagar B HathwarSagar B Hathwar
301111
asked Jan 2 at 9:12
Sagar B HathwarSagar B Hathwar
301111
301111
I think the idea behind immutability is that you can’t alter an object from outside it’s own scope. It seems you are jumping through hoops to get around this, but then why are you using an immutability library?
– Kokodoko
Jan 2 at 9:23
I have an array in redux store, an array of instances. Rather than cloning the entire array, I want to be able to change one field of one item of the array. Any simpler suggestion(not using an immutability library, perhaps?) is welcome
– Sagar B Hathwar
Jan 2 at 9:43
add a comment |
I think the idea behind immutability is that you can’t alter an object from outside it’s own scope. It seems you are jumping through hoops to get around this, but then why are you using an immutability library?
– Kokodoko
Jan 2 at 9:23
I have an array in redux store, an array of instances. Rather than cloning the entire array, I want to be able to change one field of one item of the array. Any simpler suggestion(not using an immutability library, perhaps?) is welcome
– Sagar B Hathwar
Jan 2 at 9:43
I think the idea behind immutability is that you can’t alter an object from outside it’s own scope. It seems you are jumping through hoops to get around this, but then why are you using an immutability library?
– Kokodoko
Jan 2 at 9:23
I think the idea behind immutability is that you can’t alter an object from outside it’s own scope. It seems you are jumping through hoops to get around this, but then why are you using an immutability library?
– Kokodoko
Jan 2 at 9:23
I have an array in redux store, an array of instances. Rather than cloning the entire array, I want to be able to change one field of one item of the array. Any simpler suggestion(not using an immutability library, perhaps?) is welcome
– Sagar B Hathwar
Jan 2 at 9:43
I have an array in redux store, an array of instances. Rather than cloning the entire array, I want to be able to change one field of one item of the array. Any simpler suggestion(not using an immutability library, perhaps?) is welcome
– Sagar B Hathwar
Jan 2 at 9:43
add a comment |
0
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I think the idea behind immutability is that you can’t alter an object from outside it’s own scope. It seems you are jumping through hoops to get around this, but then why are you using an immutability library?
– Kokodoko
Jan 2 at 9:23
I have an array in redux store, an array of instances. Rather than cloning the entire array, I want to be able to change one field of one item of the array. Any simpler suggestion(not using an immutability library, perhaps?) is welcome
– Sagar B Hathwar
Jan 2 at 9:43