method
transform_keys
v2_5_5 -
Show latest stable
-
0 notes -
Class: Hash
- 1_8_6_287
- 1_8_7_72
- 1_8_7_330
- 1_9_1_378
- 1_9_2_180
- 1_9_3_125
- 1_9_3_392
- 2_1_10
- 2_2_9
- 2_4_6
- 2_5_5 (0)
- 2_6_3 (0)
- What's this?
transform_keys()
public
Returns a new hash with the results of running the block once for every key. This method does not change the values.
h = { a: 1, b: 2, c: 3 } h.transform_keys {|k| k.to_s } #=> { "a" => 1, "b" => 2, "c" => 3 } h.transform_keys(&:to_s) #=> { "a" => 1, "b" => 2, "c" => 3 } h.transform_keys.with_index {|k, i| "#{k}.#{i}" } #=> { "a.0" => 1, "b.1" => 2, "c.2" => 3 }
If no block is given, an enumerator is returned instead.