Scala - extracting first element of inner array of strings from nested arrays of strings

Question

I am new to Scala and could use some help. I have an RDD that is Array[Array[String]]. I need to extract the 1st element in each internal array. Sample records look like:

res21: Array[Array[String]] = Array (Array(217.150.149.167, -, 4712, [15/Sep/2013:23:56:06, +0100], "GET, /ronin_s4.jpg), Array(104.184.210.93, -, 28402, [15/Sep/2013:23:42:53, +0100], "GET, /titanic_2200.jpg), Array(37.91.137.134, -, 36171, [15/Sep/2013:23:39:33, +0100], "GET, /ronin_novelty_note_3.jpg) ) I need the results to be:

217.150.149.167
104.184.210.93
37.91.137.134

Thanks, Rachel

Tanjin · Accepted Answer · 2017-10-10 17:59:31Z

1

Is it okay if your final collection is an Array? You can try:

res21.flatMap(_.headOption) // headOption to be safe and flatMap to flatten the collection

answered Oct 10, 2017 at 17:59

Tanjin

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