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#collect is an alias for #reduce, not #map, making it like Python reduce().

• dragonwriter 5y ago
  > #collect is an alias for #reduce It’s not, though. (If it was, we could write about its equivalence with Python’s [from functools in py3, core in Py2] reduce function, though, saying much the same thing as about the actual equivalence with map upthread, except reduce/inject is less often a substitute for generators than map/collect.) #map is an alias for #collect. [0] #reduce has the alias #inject. [1] [0] https://ruby-doc.org/core-3.0.2/Enumerable.html#method-i-collect https://ruby-doc.org/core-3.0.2/Enumerable.html#method-i-col... [1] https://ruby-doc.org/core-3.0.2/Enumerable.html#method-i-inject https://ruby-doc.org/core-3.0.2/Enumerable.html#method-i-inj...
  • pansa2 5y ago
    Then should the example in the above comment, `some_enum.collect(&:+)`, be using reduce instead of collect?
    • busterarm 5y ago
      Yes. My bad. :) I haven't been a professional Rubyist in some years but my habit here was to use inject.
  • halostatue 5y ago
    You’re right. My apologies.