Delete Elements from an Array

Question

I have an Array that looks like below

[ [0] "The Jungle Book", [1] { "error" => "NO accessor for text", "methodName" => "text", "receiverString" => "android.widget.LinearLayout{438ce3c8 V.E..... ........ 0,65-148,111 #7f0902b0 app:id/movieScoreRtLayout}", "receiverClass" => "android.widget.LinearLayout" }, [2] "Bruce Reitherman, Phil Harris", [3] "PG, 1 hr. 18 min.", [4] { "error" => "NO accessor for text", "methodName" => "text", "receiverString" => "com.flixster.android.view.UnclickableRelativeLayout{42ef9d18 V.E..... ........ 0,1-1080,275}", "receiverClass" => "com.flixster.android.view.UnclickableRelativeLayout" }, [5] { "error" => "NO accessor for text", "methodName" => "text", "receiverString" => "android.widget.ListView{43bd1548 VFED.VC. .F...... 0,0-1080,1542 #7f0901a7 app:id/lvi_listview}", "receiverClass" => "android.widget.ListView" }, [6] { "error" => "NO accessor for text", "methodName" => "text", "receiverString" => "android.widget.FrameLayout{42eeff30 V.E..... ........ 0,0-1080,1701 #1020002 android:id/content}", "receiverClass" => "android.widget.FrameLayout" }, [7] { "error" => "NO accessor for text", "methodName" => "text", "receiverString" => "android.widget.FrameLayout{42e57e98 V.E..... ........ 0,0-1080,1701 #1020011 android:id/tabcontent}", "receiverClass" => "android.widget.FrameLayout" }

]

I want to be able to get the resultant array that contains the following:

["The Jungle Book" , "Bruce Reitherman, Phil Harris" , "PG, 1 hr. 18 min." ]

Please consider pasting data fragments in plain p or pp format. The augmented format we see here isn't executable without being edited. — Wayne Conrad
– Wayne Conrad, Commented Feb 24, 2014 at 16:28

Arup Rakshit · Accepted Answer · 2014-02-16 10:08:02Z

This is a correct example to use Enumerable#grep :

Returns an array of every element in enum for which Pattern === element. If the optional block is supplied, each matching element is passed to it, and the block’s result is stored in the output array.

a = [ "The Jungle Book", { "error" => "NO accessor for text", }, "Bruce Reitherman, Phil Harris", "PG, 1 hr. 18 min.", { "error" => "NO accessor for text", }, { "error" => "NO accessor for text", }, { "error" => "NO accessor for text", }, { "error" => "NO accessor for text", } ] a.grep(String) # => ["The Jungle Book", "Bruce Reitherman, Phil Harris", "PG, 1 hr. 18 min."]

falsetru · Accepted Answer · 2014-02-16 10:17:22Z

Using Array#delete_if, you can remove non-string elements:

a = [ "The Jungle Book", { "error" => "NO accessor for text", }, "Bruce Reitherman, Phil Harris", "PG, 1 hr. 18 min.", { "error" => "NO accessor for text", }, { "error" => "NO accessor for text", }, { "error" => "NO accessor for text", }, { "error" => "NO accessor for text", } ] a.delete_if { |x| ! x.is_a? String } # OR a.delete_if { |x| x.is_a? Hash } a # => ["The Jungle Book", "Bruce Reitherman, Phil Harris", "PG, 1 hr. 18 min."]

Or as Arupt Rakshit commented, you can use Array#select! or Array#keep_if:

a.select! { |x| x.is_a? String } a.keep_if { |x| x.is_a? String }

@ArupRakshit, In the title, delete is explicitly mentioned. I assumed that the OP want to delete element in place. BTW, thank you for the suggestion.
updated the answer to include an alternative solution that use Array#select!, Array#keep_if.
You can also do - a.select!(&String.method(:===))... more shorter version... :-)

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