How to remove empty hash from array

Question

How can I remove empty hash's from an array?

[{}, {}, :one, :two]

.compact does not seem to work.

[{}, {}, :one, :two] - [{}] is another way that hasn't been mentioned in the answers. — Cary Swoveland
– Cary Swoveland, Commented Sep 20, 2019 at 7:38

Sebastián Palma · Accepted Answer · 2019-09-20 06:22:26Z

6

How can I remove empty hash's from an array?

Using reject, to reject elements in an enumerable by checking if the element is a Hash and is empty ({}):

p [{}, {}, :one, :two, [], [], '', nil].reject { |e| e == {} }
# [:one, :two, [], [], "", nil]

edited Sep 20, 2019 at 6:22

answered Sep 19, 2019 at 20:04

Sebastián Palma

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3 Comments

arcadeblast77 Over a year ago

+1 I was going to post recommending the use of select, until I saw your answer. I feel reject is much more readable than select with negative conditions in the block.

SRack Over a year ago

The best answer as it can handle whatever's thrown at it :)

BobRodes Over a year ago

@CarySwoveland That does appear more concise, doesn't it?

steenslag · Accepted Answer · 2019-09-19 21:38:24Z

4

Delete empty hashes:

ar = [{}, {}, :one, :two]
ar.delete({})
p ar # => [:one, :two]

answered Sep 19, 2019 at 21:38

steenslag

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Comments

iGian · Accepted Answer · 2019-09-19 19:58:29Z

1

Try Array#reject unwanted elements:

ary = [{}, {}, :one, :two]
ary.reject! { |h| h.empty? }
ary
#=> [:one, :two]

answered Sep 19, 2019 at 19:58

iGian

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