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
}