How to access JsArray of double via index in Scala?

Question

In Play 2.3 framework, the response is parsed as JSON. Given the following data:

{"content": [1, 2, 3, 4, 5, 6]}

I tried to access every other elements of the array (i.e. 1, 3, 5) by

// Scala
val array = (response \ "content").as[JsArray].value
for (i <- 0 until array.size / 2)
  println(array(i * 2))

But array(i*2) raised error. What would be the canonical approach of access JsArray via index?

Shaido · Accepted Answer · 2017-05-09 09:06:29Z

1

You can try:

for(i <- 0 until array.size if i % 2 == 0)
  println(array(i * 2))

A better way would be to loop over the elements instead:

for((a,i) <- array.zipWithIndex if i % 2 == 0)
  println(a)

answered May 9, 2017 at 9:06

Shaido

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