Returning a new object reference when mutation happens
$begingroup$
i attempted to create a way (not sure if already implemented by someone) by which when i update a property of an object. it returns a new reference of the object with the new value.
i have a usecase in my mind for that purpose you can say i want to use it.
for some example reference you can consider redux reducer where you have to return a new reference everytime store is updated.
here is my small code which attempts to do it.
kindly ignore the setIn implementation its the first attempt.
function NewRef(jsObj) {
Object.keys(jsObj).forEach((key) => {
this[key] = jsObj[key];
});
}
NewRef.prototype.set = function set(key, value) {
let copyValue = null;
if (typeof value === 'object') copyValue = { ...value };
else if (Array.isArray(value)) copyValue = [...value];
else copyValue = value;
if (this[key] || ['object', 'boolean', 'number'].includes(typeof this[key])) {
return Object.assign(Object.create(Object.getPrototypeOf(this)), {
...this,
[key]: copyValue,
});
}
throw new Error(`invalide key ${key} in object`);
};
NewRef.prototype.setIn = function set(nested, value) {
let copyValue = null;
if (typeof value === 'object') copyValue = { ...value };
else if (Array.isArray(value)) copyValue = [...value];
else copyValue = value;
if (!Array.isArray(nested)) {
throw new Error('setIn requires array of strings as first argument');
} else {
if (this[nested[0]] || ['object', 'boolean', 'number'].includes(typeof this[nested[0]])) {
if (this[nested[0]][nested[1]] || ['object', 'boolean', 'number'].includes(typeof this[nested[0]][nested[1]])) {
return Object.assign(Object.create(Object.getPrototypeOf(this)), {
...this,
[nested[0]]: {
...this[nested[0]],
[nested[1]]: copyValue,
},
});
}
}
throw new Error(`invalid properties maybe ${nested.join(',')}`);
}
};
NewRef.prototype.get = function get(key) {
return this[key];
};
export default function NObject(jsObj) {
const store = new NewRef(jsObj);
return store;
}
with this piece of code i am able to do this.
const d1 = NObject({
type: 'bool',
data: {key:'value'}
meta: {
user: 'john doe'
}
})
const n1 = d1.set('type','mutated').set('data',[1,2])
const n2 = n1.setIn(['meta','user'],'foo bar');
both n1,n2 and d1 have different references. it works and is tested well.
please feel free to review it and give your suggestions. i am open to everything
javascript ecmascript-6 redux
asked 19 mins ago
hannad rehmanhannad rehman
1011
New contributor
hannad rehman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
add a comment |
$begingroup$
i attempted to create a way (not sure if already implemented by someone) by which when i update a property of an object. it returns a new reference of the object with the new value.
i have a usecase in my mind for that purpose you can say i want to use it.
for some example reference you can consider redux reducer where you have to return a new reference everytime store is updated.
here is my small code which attempts to do it.
kindly ignore the setIn implementation its the first attempt.
function NewRef(jsObj) {
Object.keys(jsObj).forEach((key) => {
this[key] = jsObj[key];
});
}
NewRef.prototype.set = function set(key, value) {
let copyValue = null;
if (typeof value === 'object') copyValue = { ...value };
else if (Array.isArray(value)) copyValue = [...value];
else copyValue = value;
if (this[key] || ['object', 'boolean', 'number'].includes(typeof this[key])) {
return Object.assign(Object.create(Object.getPrototypeOf(this)), {
...this,
[key]: copyValue,
});
}
throw new Error(`invalide key ${key} in object`);
};
NewRef.prototype.setIn = function set(nested, value) {
let copyValue = null;
if (typeof value === 'object') copyValue = { ...value };
else if (Array.isArray(value)) copyValue = [...value];
else copyValue = value;
if (!Array.isArray(nested)) {
throw new Error('setIn requires array of strings as first argument');
} else {
if (this[nested[0]] || ['object', 'boolean', 'number'].includes(typeof this[nested[0]])) {
if (this[nested[0]][nested[1]] || ['object', 'boolean', 'number'].includes(typeof this[nested[0]][nested[1]])) {
return Object.assign(Object.create(Object.getPrototypeOf(this)), {
...this,
[nested[0]]: {
...this[nested[0]],
[nested[1]]: copyValue,
},
});
}
}
throw new Error(`invalid properties maybe ${nested.join(',')}`);
}
};
NewRef.prototype.get = function get(key) {
return this[key];
};
export default function NObject(jsObj) {
const store = new NewRef(jsObj);
return store;
}
with this piece of code i am able to do this.
const d1 = NObject({
type: 'bool',
data: {key:'value'}
meta: {
user: 'john doe'
}
})
const n1 = d1.set('type','mutated').set('data',[1,2])
const n2 = n1.setIn(['meta','user'],'foo bar');
both n1,n2 and d1 have different references. it works and is tested well.
please feel free to review it and give your suggestions. i am open to everything
javascript ecmascript-6 redux
asked 19 mins ago
hannad rehmanhannad rehman
1011
New contributor
hannad rehman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
add a comment |
$begingroup$
i attempted to create a way (not sure if already implemented by someone) by which when i update a property of an object. it returns a new reference of the object with the new value.
i have a usecase in my mind for that purpose you can say i want to use it.
for some example reference you can consider redux reducer where you have to return a new reference everytime store is updated.
here is my small code which attempts to do it.
kindly ignore the setIn implementation its the first attempt.
function NewRef(jsObj) {
Object.keys(jsObj).forEach((key) => {
this[key] = jsObj[key];
});
}
NewRef.prototype.set = function set(key, value) {
let copyValue = null;
if (typeof value === 'object') copyValue = { ...value };
else if (Array.isArray(value)) copyValue = [...value];
else copyValue = value;
if (this[key] || ['object', 'boolean', 'number'].includes(typeof this[key])) {
return Object.assign(Object.create(Object.getPrototypeOf(this)), {
...this,
[key]: copyValue,
});
}
throw new Error(`invalide key ${key} in object`);
};
NewRef.prototype.setIn = function set(nested, value) {
let copyValue = null;
if (typeof value === 'object') copyValue = { ...value };
else if (Array.isArray(value)) copyValue = [...value];
else copyValue = value;
if (!Array.isArray(nested)) {
throw new Error('setIn requires array of strings as first argument');
} else {
if (this[nested[0]] || ['object', 'boolean', 'number'].includes(typeof this[nested[0]])) {
if (this[nested[0]][nested[1]] || ['object', 'boolean', 'number'].includes(typeof this[nested[0]][nested[1]])) {
return Object.assign(Object.create(Object.getPrototypeOf(this)), {
...this,
[nested[0]]: {
...this[nested[0]],
[nested[1]]: copyValue,
},
});
}
}
throw new Error(`invalid properties maybe ${nested.join(',')}`);
}
};
NewRef.prototype.get = function get(key) {
return this[key];
};
export default function NObject(jsObj) {
const store = new NewRef(jsObj);
return store;
}
with this piece of code i am able to do this.
const d1 = NObject({
type: 'bool',
data: {key:'value'}
meta: {
user: 'john doe'
}
})
const n1 = d1.set('type','mutated').set('data',[1,2])
const n2 = n1.setIn(['meta','user'],'foo bar');
both n1,n2 and d1 have different references. it works and is tested well.
please feel free to review it and give your suggestions. i am open to everything
javascript ecmascript-6 redux
asked 19 mins ago
hannad rehmanhannad rehman
1011
New contributor
hannad rehman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
i attempted to create a way (not sure if already implemented by someone) by which when i update a property of an object. it returns a new reference of the object with the new value.
i have a usecase in my mind for that purpose you can say i want to use it.
for some example reference you can consider redux reducer where you have to return a new reference everytime store is updated.
here is my small code which attempts to do it.
kindly ignore the setIn implementation its the first attempt.
function NewRef(jsObj) {
Object.keys(jsObj).forEach((key) => {
this[key] = jsObj[key];
});
}
NewRef.prototype.set = function set(key, value) {
let copyValue = null;
if (typeof value === 'object') copyValue = { ...value };
else if (Array.isArray(value)) copyValue = [...value];
else copyValue = value;
if (this[key] || ['object', 'boolean', 'number'].includes(typeof this[key])) {
return Object.assign(Object.create(Object.getPrototypeOf(this)), {
...this,
[key]: copyValue,
});
}
throw new Error(`invalide key ${key} in object`);
};
NewRef.prototype.setIn = function set(nested, value) {
let copyValue = null;
if (typeof value === 'object') copyValue = { ...value };
else if (Array.isArray(value)) copyValue = [...value];
else copyValue = value;
if (!Array.isArray(nested)) {
throw new Error('setIn requires array of strings as first argument');
} else {
if (this[nested[0]] || ['object', 'boolean', 'number'].includes(typeof this[nested[0]])) {
if (this[nested[0]][nested[1]] || ['object', 'boolean', 'number'].includes(typeof this[nested[0]][nested[1]])) {
return Object.assign(Object.create(Object.getPrototypeOf(this)), {
...this,
[nested[0]]: {
...this[nested[0]],
[nested[1]]: copyValue,
},
});
}
}
throw new Error(`invalid properties maybe ${nested.join(',')}`);
}
};
NewRef.prototype.get = function get(key) {
return this[key];
};
export default function NObject(jsObj) {
const store = new NewRef(jsObj);
return store;
}
with this piece of code i am able to do this.
const d1 = NObject({
type: 'bool',
data: {key:'value'}
meta: {
user: 'john doe'
}
})
const n1 = d1.set('type','mutated').set('data',[1,2])
const n2 = n1.setIn(['meta','user'],'foo bar');
both n1,n2 and d1 have different references. it works and is tested well.
please feel free to review it and give your suggestions. i am open to everything
javascript ecmascript-6 redux
javascript ecmascript-6 redux
asked 19 mins ago
hannad rehmanhannad rehman
1011
New contributor
hannad rehman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 19 mins ago
hannad rehmanhannad rehman
1011
New contributor
hannad rehman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 19 mins ago
hannad rehmanhannad rehman
1011
New contributor
hannad rehman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 19 mins ago
hannad rehmanhannad rehman
1011
asked 19 mins ago
hannad rehmanhannad rehman
1011
1011
New contributor
hannad rehman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
hannad rehman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
hannad rehman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
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