Incorporate newly-added lambda and object functions

[anthony-c-martin]

The following functions and changes to existing functions were added in ARM's 2024w12 release:

New functions:
objectKeys: Returns the keys of an object parameter.
mapValues: Create an object from an input object, using a custom lambda to map values.
groupBy: Create an object with array values from an array, using a grouping condition.
shallowMerge: Perform a shallow merge of input object parameters. Required to implement a "spread" operator in Bicep.

Updated functions:
map: Support optional index argument.
reduce: Support optional index argument.
filter: Support optional index argument.

Once this release has been rolled out globally, we should update Bicep to support the new capabilities.

This addresses some of the issues described under the following: #9244, #1560, #2082, #1853

[miqm]

@anthony-c-martin will the distinct function also be available?

[anthony-c-martin]

@anthony-c-martin will the distinct function also be available?

No, sorry - this wasn't one of the functions I added. For distinct, what behavior would you expect for handling arrays and objects?

My expectation would be exact structural equality:

var a = distinct([[1], [1]) // returns [[1]]
var b = distinct([[1, 2], [1]) // returns [[1, 2], [1]]
var c = distinct([{a: 1}, {a: 1}] // returns [{a: 1}]
var d = distinct([{a: 1}, {a: 1, b: 2}]) // returns [{a: 1}, {a: 1, b: 2}]

It may also be useful to add a distinctBy function that accepts a lambda:

var foo = distinctBy([{a: 1}, {a: 1, b: 2}], (x, y) => x['a'] == y['a']) // returns [{a: 1}]

[anthony-c-martin]

Closed by #13658.

@miqm for the distinct ask - please could you raise a new issue and answer my above question?

[miqm]

Closed by #13658.

@miqm for the distinct ask - please could you raise a new issue and answer my above question?

#2082 already exists. It was mentioned in the ticket description therefore I asked if it's going to be supported as I didn't see it on the list.