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 8 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 8 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 8 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 8 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 8 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 8 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 8 mins ago
hannad rehmanhannad rehman
1011
asked 8 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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