Adaptive Expressions: fill in obvious gaps with additional pre-built functions

[Stevenic]

Issue

This issue is to track additional functions we want to add to Adaptive Expressions for R10. Just reply with a proposed function.

[dcr]

[Stevenic]

indexOf

This function should let you lookup the index of an item matching a filter.

[Stevenic]

merge

This function would let you merge one or more JSON objects into a single JSON object.

[Danieladu]

It would be better if a sample is attached for each function

[KayMKM]

A function that can combine two list.
E.g. a=[1, 2, 3], b=[2, 3, 4], combine(a, b)=[1, 2, 3, 2, 3, 4]

[boydc2014]

@Danieladu can you propose the function signature for those functions and let us review

[Danieladu]

indexOf/lastIndexOf

Expression already contains these two functions, but just with the default equals condition.
So, should we change the original function to make it 'lambda'? The function may like:
indexOf([1, 2, 3], x, x > 2)
Change the original function maybe a breaking change?

merge

merge(json1, json2), should we add some more parameters? like ignore case

Combine two list

Now expression has function union to combine two lists and remove the duplicated items.
So, the function's name is the biggest issue, combine? addrange ? concatList? (concat is exist)

[vishwacsena]

index/indexof - need to verify with @Stevenic if what we have is enough
merge(json, json) makes sense.
concat(list1, list2) makes sense.

[boydc2014]

@Stevenic can you confirm what we have now index\indexof is good enough?

@Danieladu can you list what's the way to do index based on a filter condition like x > 2 today, or it's not supported?

[Danieladu]

Here is the workaround:
where(indicesAndValues(user_list), x, x.value > 2)[0].index

In the next stage, we may consider extend some functions to support the filter scenario with lambda expression. like first, last, count, indexOf, lastIndexOf .etc.

Examples:

first(list, x, x > 2)
last(list, x, x>2)
count(list, x, x>2)
indexOf(list, x, x > 2)
lastIndexOf(list, x, x > 2)

But before these features are completed, users can also achieve these results through the solution by other builtin functions or customize functions.

[boydc2014]

@Stevenic we are closing this now, see above the resolved issue, if you continue to have gaps, let's track them via new issues