Given a 

BehaviorSubject<object> smartObject = new BehaviorSubject<object>(
    {key1: value1,
     key2: { key2_1: value2_1, key2_2: value2_2}, 
    ...}
);
,angular,rxjs"/>
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首页 > 解决方案 > 如何更新/更改 BehaviorSubject 的值?

Given a 

BehaviorSubject<object> smartObject = new BehaviorSubject<object>(
    {key1: value1,
     key2: { key2_1: value2_1, key2_2: value2_2}, 
    ...}
);

angular - 如何更新/更改 BehaviorSubject 的值?

Given a 

BehaviorSubject<object> smartObject = new BehaviorSubject<object>(
    {key1: value1,
     key2: { key2_1: value2_1, key2_2: value2_2}, 
    ...}
);

问题描述

Given a 

BehaviorSubject<object> smartObject = new BehaviorSubject<object>(
    {key1: value1,
     key2: { key2_1: value2_1, key2_2: value2_2}, 
    ...}
);

How can I change each value and how can I add new keys?

Like so: 

    notsmartObject.key1 = value24; 
    notsmartObject.key2.key2_1 = xy; 
    notsmartObject['newKey'] = newValue;

I know of .next(), but I dont want to copy the whole object, add/change whatever I want and put it into the next function. Seems a bit inefficient and risky to me, since the current smartObject could be overwritten before .next() can be executed with the new Object. This is what I mean: 

let newObject = smartObject.getValue(); 
newObject.key1 = value24; 
...
smartObject.next(newObject);

You could something like this if that's what you're asking:

const subject = new BehaviorSubject();

...

subject
  .pipe(
    take(1),
  )
  .subscribe(buffer => subject.next({
    ...buffer,
    foo: 42,
  }));

标签： angularrxjs

解决方案

如果这就是您要问的，您可以这样做：

const subject = new BehaviorSubject();

...

subject
  .pipe(
    take(1),
  )
  .subscribe(buffer => subject.next({
    ...buffer,
    foo: 42,
  }));

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