Howto merge two arrays with values from array2 that are in 1?

Question

I have an array with allowed values and an array with given values.

allowed_values => ["one", "two", "three"]
given_values => ["", "one", "five", "three", "seven"]

...

expected_values => ["one", "three"]

user229044 · Accepted Answer · 2012-04-05 11:29:09Z

4

You want the array intersection, and you can obtain it via the & operator:

Set Intersection—Returns a new array containing elements common to the two arrays, with no duplicates.

[ 1, 1, 3, 5 ] & [ 1, 2, 3 ]   #=> [ 1, 3 ]

edited Apr 5, 2012 at 11:29

answered Apr 5, 2012 at 11:23

user229044♦

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2 Comments

tonymarschall Over a year ago

Its php, but thanks for the tip on intersection. Found [ 1, 1, 3, 5 ] & [ 1, 2, 3 ] #=> [ 1, 3 ] from the ruby docs

user229044 Over a year ago

Err, wow. I somehow just assumed PHP despite the obvious Ruby code. I can only attribute this to having been awake less than 10 minutes. Apologies and I'm glad I at least gave you "array intersection" to Google.

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