dpep/rekey_rb

Reformat Ruby Enumerables into Hashes, using derived keys / values.

Rekey

Reformat Enumerables into Hashes, using derived keys / values

Install

gem install rekey

Usage

require "rekey"

# key a list of records by id
[
  { id: 1, name: "alice", age: 30},
  { id: 2, name: "bob", age: 24},
  { id: 3, name: "charlie", age: 88},
].rekey :id
=> {
  1 => { id: 1, name: "alice", age: 30},
  2 => { id: 2, name: "bob", age: 24},
  3 => { id: 3, name: "charlie", age: 88},
}


# create an id => value map from a list of records
[
  { id: 1, name: "alice", age: 30},
  { id: 2, name: "bob", age: 24},
  { id: 3, name: "charlie", age: 88},
].rekey :id, :name
=> {
  1 => "alice",
  2 => "bob",
  3 => "charlie"
}


# or use blocks
[ 2, 4, 6 ].rekey {|v| v / 2}
=> {
  1 => 2,
  2 => 4,
  3 => 6
}

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