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.