[METRON-626] Add Higher-Order Map Function to Stellar

• Type: Improvement
• Status: Done
• Priority: Major
• Resolution: Done
• Assignee: Unassigned
• Reporter: Nick Allen
• Created: 15/Dec/16 16:08
• Updated: 07/Apr/17 15:24
• Resolved: 07/Apr/17 15:23

Description

It would be extremely useful to have a 'map' higher-order function in Stellar. A 'flat map' might also be needed.

https://en.wikipedia.org/wiki/Map_(higher-order_function)

A few examples that I am thinking of. Ignore my choice of syntax. I am just trying to express the use cases here.

Fetch all of the profile measurements over the past 2 hours. There may be many. What is the mean of each of those measurements?

stats := PROFILE_GET('p1', 'e1', 2, "HOURS")
stats.MAP( s -> STATS_MEAN(s))

Get profile measurements taken 1 week ago, 2 weeks ago, and 3 weeks ago, so that I can then compare them.

{ "1 week", "2 weeks", "3 weeks" }.MAP( lookback -> PROFILE_GET('p1','e1', lookback)

Issue Links

• duplicates: METRON-831 Add lambda expressions and rudimentary functional programming primitives to Stellar