transpose_pairs/2

Documentation
- Reference manual
  - The SWI-Prolog library
    - library(pairs): Operations on key-value lists
- Packages

Availability::- use_module(library(pairs)).(can be autoloaded)

Source

[det]transpose_pairs(+Pairs, -Transposed)

Swap Key-Value to Value-Key. The resulting list is sorted using keysort/2 on the new key.