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I have 3 FirDataSnapshot. When I am using observeEventType(.ChildAdded,..), it returns 3 item. When I use observeSingeEventTypeOf, it returns only 1 snapshot. I don't know why.
observeSingleEventType returns single value means it observe .childAdded only once ... the block is immediately canceled after the initial data is returned.
If you are using observeEventType than it gets all values from database ..
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My app involves repeated equality comparisons of many megabytes of an array of strings. I was (naively?) surprised that such comparisons became immensely faster when I added a shadow array of the count of each string; if the counts are not equal, the strings cannot be equal.
I would have thought that the Swift compiler could easily and efficiently maintain a string's count in the internal representation, and short-circuit string equality comparisons if the counts differ. The initial creation of each string would provide the opportunity to initialize the count, and each manipulation would then know the count of each participant. But it seems not so. If only some applications would benefit from a stored count, a compiler switch to turn it on could help them.
Would this be a reasonable standard library refinement?
The problem with String is that it is not stored always in the same way. There are different types of storage and for them to be properly compared, they have to be converted to the same representation first.
Looking into the source code here: StringComparison.swift, I think you are right and count should be compared first when checking equality.
I recommend filing a bug.
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I have this code, and it is supposed to write to Firestore. However, when it does the function, in the back end, it shows highlighted as red and then disappears.
db.collection("jokes").document("Dad Jokes").setData(["\(dadJokeNum + 1)": Joke.text!])
Please help.
Using SetData without Merge will delete existing values - it is suggested that if the document exists prior, you should always be using merge: true. Firestore also has a limited 1 write per second each, you should be managing writes together as it is most likely similar writes will conflict and potentially resolve out of order.
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I want to convert the timestamp I have saved to Firebase to real time time. I have seen some codes here, and watched some youtube videos, but for some odd reason I can't get the timeIntervalSince1970 function up?
The only available function I can call is NSTimeIntervalSince1970. Why is this?
timeIntervalSince1970 is a property of Date. A Firestore Timestamp object is not a Date - it is its own type. If you want to convert it to a Date, you can call its dateValue() method. This will give you a Date, and you can use timeIntervalSince1970 on that.
Or, even better, you can use the seconds property on the Timestamp directly and skip Date altogether.
You should just be able to use Date().timeIntervalSince1970
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How can I create a member in a PDS using either JCL or REXX? The member's name must contain the actual date. Is that possible?
It can be done in JCL and by Rexx. You need to remember that member names are a maximum of 8 bytes and cannot start with a numeric so you would need to use something like the 'Julian' date e.g. 2017365. You may have system variables available to populate your JCL - check the JCL manual and level of Z/os that you are using.
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Is there an effective way to observe two nodes at once from firebase? Could you write sample code for it if possible?
Put call for the second node in the completionBlock of the first one:
For example i have my user's location coordinates(lat and lng) stored in two node's stored under my UserId:-
ref.child(FIRAuth.auth()!.currentUser!.uid).child("latitude").observeEventType(.Value, withBlock: {(SnapshotLAT) in
ref.child(FIRAuth.auth()!.currentUser!.uid).child("longitude").observeEventType(.Value, withBlock: {(SnapshotLNG) in
.....
.....
})
})
Maybe i could help you more if you posted your JSON structure here....