Updating property values dynamically is replacing the entire object












0















I'm trying to update a dataStore service I'm building and I'm hung up on the strangest problem.



public setOptions(params: Params): void {

console.log(this._dataStore.options); // always empty here!!!

for (const key of Object.keys(params)) {
this._dataStore['options'][key] = params[key];
}

console.log(this._dataStore.options); // parameter(s) added
}


Calling setOptions() with the initial set of URL parameters works and _dataStore.options contain the properties reflecting the incoming parameters.



The problem is anytime I call setOptions the options properties are replaced by the new params instead of updating them or adding new additions.



console.log(this._dataStore.options); // city: la  


This makes no sense to me, can someone help me understand and how to properly update the .options object?










share|improve this question

























  • I'm not sure what you expect to happen. Can you explain further with some examples of _dataStore.options both before and after calling setOptions() multiple times?

    – Phil
    Nov 22 '18 at 23:05











  • Are you trying to merge them with existing perhaps? Issue is not clear at all

    – charlietfl
    Nov 22 '18 at 23:08













  • Yes I am trying to merge them. I explain in the code properties are being replaced, not updated or added

    – TR3B
    Nov 22 '18 at 23:10











  • Can you please show examples of what you expect to happen given specific params

    – Phil
    Nov 22 '18 at 23:11











  • There is absolutely nothing in the code shown that would remove the claimed and location properties from _dataStore.options

    – Phil
    Nov 22 '18 at 23:13


















0















I'm trying to update a dataStore service I'm building and I'm hung up on the strangest problem.



public setOptions(params: Params): void {

console.log(this._dataStore.options); // always empty here!!!

for (const key of Object.keys(params)) {
this._dataStore['options'][key] = params[key];
}

console.log(this._dataStore.options); // parameter(s) added
}


Calling setOptions() with the initial set of URL parameters works and _dataStore.options contain the properties reflecting the incoming parameters.



The problem is anytime I call setOptions the options properties are replaced by the new params instead of updating them or adding new additions.



console.log(this._dataStore.options); // city: la  


This makes no sense to me, can someone help me understand and how to properly update the .options object?










share|improve this question

























  • I'm not sure what you expect to happen. Can you explain further with some examples of _dataStore.options both before and after calling setOptions() multiple times?

    – Phil
    Nov 22 '18 at 23:05











  • Are you trying to merge them with existing perhaps? Issue is not clear at all

    – charlietfl
    Nov 22 '18 at 23:08













  • Yes I am trying to merge them. I explain in the code properties are being replaced, not updated or added

    – TR3B
    Nov 22 '18 at 23:10











  • Can you please show examples of what you expect to happen given specific params

    – Phil
    Nov 22 '18 at 23:11











  • There is absolutely nothing in the code shown that would remove the claimed and location properties from _dataStore.options

    – Phil
    Nov 22 '18 at 23:13
















0












0








0








I'm trying to update a dataStore service I'm building and I'm hung up on the strangest problem.



public setOptions(params: Params): void {

console.log(this._dataStore.options); // always empty here!!!

for (const key of Object.keys(params)) {
this._dataStore['options'][key] = params[key];
}

console.log(this._dataStore.options); // parameter(s) added
}


Calling setOptions() with the initial set of URL parameters works and _dataStore.options contain the properties reflecting the incoming parameters.



The problem is anytime I call setOptions the options properties are replaced by the new params instead of updating them or adding new additions.



console.log(this._dataStore.options); // city: la  


This makes no sense to me, can someone help me understand and how to properly update the .options object?










share|improve this question
















I'm trying to update a dataStore service I'm building and I'm hung up on the strangest problem.



public setOptions(params: Params): void {

console.log(this._dataStore.options); // always empty here!!!

for (const key of Object.keys(params)) {
this._dataStore['options'][key] = params[key];
}

console.log(this._dataStore.options); // parameter(s) added
}


Calling setOptions() with the initial set of URL parameters works and _dataStore.options contain the properties reflecting the incoming parameters.



The problem is anytime I call setOptions the options properties are replaced by the new params instead of updating them or adding new additions.



console.log(this._dataStore.options); // city: la  


This makes no sense to me, can someone help me understand and how to properly update the .options object?







typescript object parameters






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 23 '18 at 15:05







TR3B

















asked Nov 22 '18 at 23:00









TR3BTR3B

1,72322759




1,72322759













  • I'm not sure what you expect to happen. Can you explain further with some examples of _dataStore.options both before and after calling setOptions() multiple times?

    – Phil
    Nov 22 '18 at 23:05











  • Are you trying to merge them with existing perhaps? Issue is not clear at all

    – charlietfl
    Nov 22 '18 at 23:08













  • Yes I am trying to merge them. I explain in the code properties are being replaced, not updated or added

    – TR3B
    Nov 22 '18 at 23:10











  • Can you please show examples of what you expect to happen given specific params

    – Phil
    Nov 22 '18 at 23:11











  • There is absolutely nothing in the code shown that would remove the claimed and location properties from _dataStore.options

    – Phil
    Nov 22 '18 at 23:13





















  • I'm not sure what you expect to happen. Can you explain further with some examples of _dataStore.options both before and after calling setOptions() multiple times?

    – Phil
    Nov 22 '18 at 23:05











  • Are you trying to merge them with existing perhaps? Issue is not clear at all

    – charlietfl
    Nov 22 '18 at 23:08













  • Yes I am trying to merge them. I explain in the code properties are being replaced, not updated or added

    – TR3B
    Nov 22 '18 at 23:10











  • Can you please show examples of what you expect to happen given specific params

    – Phil
    Nov 22 '18 at 23:11











  • There is absolutely nothing in the code shown that would remove the claimed and location properties from _dataStore.options

    – Phil
    Nov 22 '18 at 23:13



















I'm not sure what you expect to happen. Can you explain further with some examples of _dataStore.options both before and after calling setOptions() multiple times?

– Phil
Nov 22 '18 at 23:05





I'm not sure what you expect to happen. Can you explain further with some examples of _dataStore.options both before and after calling setOptions() multiple times?

– Phil
Nov 22 '18 at 23:05













Are you trying to merge them with existing perhaps? Issue is not clear at all

– charlietfl
Nov 22 '18 at 23:08







Are you trying to merge them with existing perhaps? Issue is not clear at all

– charlietfl
Nov 22 '18 at 23:08















Yes I am trying to merge them. I explain in the code properties are being replaced, not updated or added

– TR3B
Nov 22 '18 at 23:10





Yes I am trying to merge them. I explain in the code properties are being replaced, not updated or added

– TR3B
Nov 22 '18 at 23:10













Can you please show examples of what you expect to happen given specific params

– Phil
Nov 22 '18 at 23:11





Can you please show examples of what you expect to happen given specific params

– Phil
Nov 22 '18 at 23:11













There is absolutely nothing in the code shown that would remove the claimed and location properties from _dataStore.options

– Phil
Nov 22 '18 at 23:13







There is absolutely nothing in the code shown that would remove the claimed and location properties from _dataStore.options

– Phil
Nov 22 '18 at 23:13














1 Answer
1






active

oldest

votes


















1














Merge them with Object.assign()



for (const key of Object.keys(params)) {
Object.assign(this._dataStore['options'][key] , params[key]);
// or reverse arguments if applicable
}





share|improve this answer


























  • Hey Chalietfl this is where I began only I thought Object.assign was meant to combine properties into a new object? Also it's giving me an error TypeError: Cannot convert undefined or null to object

    – TR3B
    Nov 22 '18 at 23:19













  • Target can be a new object or if it is existing one it copies properties and values from source(s)

    – charlietfl
    Nov 22 '18 at 23:20













  • If you have that error likely that dataStore doesn't have that key and need to create an object in that instance. If you would just provide some sample data in order to run this it would help. Hard for us to know how either object is constructed

    – charlietfl
    Nov 22 '18 at 23:22













  • Hmm dataStore is instantiated like this: private _dataStore = { options: {}, results: };

    – TR3B
    Nov 22 '18 at 23:23













  • Ok then it would seem you need to check if keys exist first

    – charlietfl
    Nov 22 '18 at 23:24











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1 Answer
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1 Answer
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1














Merge them with Object.assign()



for (const key of Object.keys(params)) {
Object.assign(this._dataStore['options'][key] , params[key]);
// or reverse arguments if applicable
}





share|improve this answer


























  • Hey Chalietfl this is where I began only I thought Object.assign was meant to combine properties into a new object? Also it's giving me an error TypeError: Cannot convert undefined or null to object

    – TR3B
    Nov 22 '18 at 23:19













  • Target can be a new object or if it is existing one it copies properties and values from source(s)

    – charlietfl
    Nov 22 '18 at 23:20













  • If you have that error likely that dataStore doesn't have that key and need to create an object in that instance. If you would just provide some sample data in order to run this it would help. Hard for us to know how either object is constructed

    – charlietfl
    Nov 22 '18 at 23:22













  • Hmm dataStore is instantiated like this: private _dataStore = { options: {}, results: };

    – TR3B
    Nov 22 '18 at 23:23













  • Ok then it would seem you need to check if keys exist first

    – charlietfl
    Nov 22 '18 at 23:24
















1














Merge them with Object.assign()



for (const key of Object.keys(params)) {
Object.assign(this._dataStore['options'][key] , params[key]);
// or reverse arguments if applicable
}





share|improve this answer


























  • Hey Chalietfl this is where I began only I thought Object.assign was meant to combine properties into a new object? Also it's giving me an error TypeError: Cannot convert undefined or null to object

    – TR3B
    Nov 22 '18 at 23:19













  • Target can be a new object or if it is existing one it copies properties and values from source(s)

    – charlietfl
    Nov 22 '18 at 23:20













  • If you have that error likely that dataStore doesn't have that key and need to create an object in that instance. If you would just provide some sample data in order to run this it would help. Hard for us to know how either object is constructed

    – charlietfl
    Nov 22 '18 at 23:22













  • Hmm dataStore is instantiated like this: private _dataStore = { options: {}, results: };

    – TR3B
    Nov 22 '18 at 23:23













  • Ok then it would seem you need to check if keys exist first

    – charlietfl
    Nov 22 '18 at 23:24














1












1








1







Merge them with Object.assign()



for (const key of Object.keys(params)) {
Object.assign(this._dataStore['options'][key] , params[key]);
// or reverse arguments if applicable
}





share|improve this answer















Merge them with Object.assign()



for (const key of Object.keys(params)) {
Object.assign(this._dataStore['options'][key] , params[key]);
// or reverse arguments if applicable
}






share|improve this answer














share|improve this answer



share|improve this answer








edited Nov 22 '18 at 23:18

























answered Nov 22 '18 at 23:11









charlietflcharlietfl

139k1387120




139k1387120













  • Hey Chalietfl this is where I began only I thought Object.assign was meant to combine properties into a new object? Also it's giving me an error TypeError: Cannot convert undefined or null to object

    – TR3B
    Nov 22 '18 at 23:19













  • Target can be a new object or if it is existing one it copies properties and values from source(s)

    – charlietfl
    Nov 22 '18 at 23:20













  • If you have that error likely that dataStore doesn't have that key and need to create an object in that instance. If you would just provide some sample data in order to run this it would help. Hard for us to know how either object is constructed

    – charlietfl
    Nov 22 '18 at 23:22













  • Hmm dataStore is instantiated like this: private _dataStore = { options: {}, results: };

    – TR3B
    Nov 22 '18 at 23:23













  • Ok then it would seem you need to check if keys exist first

    – charlietfl
    Nov 22 '18 at 23:24



















  • Hey Chalietfl this is where I began only I thought Object.assign was meant to combine properties into a new object? Also it's giving me an error TypeError: Cannot convert undefined or null to object

    – TR3B
    Nov 22 '18 at 23:19













  • Target can be a new object or if it is existing one it copies properties and values from source(s)

    – charlietfl
    Nov 22 '18 at 23:20













  • If you have that error likely that dataStore doesn't have that key and need to create an object in that instance. If you would just provide some sample data in order to run this it would help. Hard for us to know how either object is constructed

    – charlietfl
    Nov 22 '18 at 23:22













  • Hmm dataStore is instantiated like this: private _dataStore = { options: {}, results: };

    – TR3B
    Nov 22 '18 at 23:23













  • Ok then it would seem you need to check if keys exist first

    – charlietfl
    Nov 22 '18 at 23:24

















Hey Chalietfl this is where I began only I thought Object.assign was meant to combine properties into a new object? Also it's giving me an error TypeError: Cannot convert undefined or null to object

– TR3B
Nov 22 '18 at 23:19







Hey Chalietfl this is where I began only I thought Object.assign was meant to combine properties into a new object? Also it's giving me an error TypeError: Cannot convert undefined or null to object

– TR3B
Nov 22 '18 at 23:19















Target can be a new object or if it is existing one it copies properties and values from source(s)

– charlietfl
Nov 22 '18 at 23:20







Target can be a new object or if it is existing one it copies properties and values from source(s)

– charlietfl
Nov 22 '18 at 23:20















If you have that error likely that dataStore doesn't have that key and need to create an object in that instance. If you would just provide some sample data in order to run this it would help. Hard for us to know how either object is constructed

– charlietfl
Nov 22 '18 at 23:22







If you have that error likely that dataStore doesn't have that key and need to create an object in that instance. If you would just provide some sample data in order to run this it would help. Hard for us to know how either object is constructed

– charlietfl
Nov 22 '18 at 23:22















Hmm dataStore is instantiated like this: private _dataStore = { options: {}, results: };

– TR3B
Nov 22 '18 at 23:23







Hmm dataStore is instantiated like this: private _dataStore = { options: {}, results: };

– TR3B
Nov 22 '18 at 23:23















Ok then it would seem you need to check if keys exist first

– charlietfl
Nov 22 '18 at 23:24





Ok then it would seem you need to check if keys exist first

– charlietfl
Nov 22 '18 at 23:24


















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