Feature #8246


Added by zzak (Zachary Scott) over 7 years ago. Updated about 6 years ago.

Target version:


From (())

Traverses the given levels of a hash and returns the value associated with the
last key provided. Allows for concise access for deeply nested hashes - often encountered with dealing with external restful apis.

(({hash = { level1: { level2: { level3: 3 } } }}))
(({hash.traverse :level1, :level2, :level3 #=> 3}))
Also supports a default value block if the value is nil or the key is
not found.

(({hash.traverse(:level1, :level2, :non_existent_key) { 5 } #=> 5}))


275.patch (3.05 KB) 275.patch zzak (Zachary Scott), 04/11/2013 08:03 AM

Related issues

Related to Ruby master - Feature #8237: Logical method chaining via inferred receiverClosedActions
Is duplicate of Ruby master - Feature #5531: deep_value for dealing with nested hashesClosedmatz (Yukihiro Matsumoto)Actions

Updated by marcandre (Marc-Andre Lafortune) over 7 years ago

  • Assignee set to matz (Yukihiro Matsumoto)
  • Priority changed from Normal to 3

Marking as duplicate of #5531.
It's also related to #8237 because one could envision something like:

hash[:level1]??.[:level2]??.[:non_existent_key] || 5

Updated by headius (Charles Nutter) over 7 years ago

As a feature that affects all Ruby implementations, this should probably move to CommonRuby:

Updated by zzak (Zachary Scott) about 6 years ago

  • Status changed from Open to Closed
  • Priority changed from 3 to Normal

Yeah, sorry, this is a duplicate of #5531 with just a different method name

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