What's the function to extract the last value of an array?

[aborruso]

Hi,
how to extract the last value of an array?

If I have in example echo 'input=ciao;bau;miao' | mlrgo --ojson put '$array=splita($input,";")', and I want to extract the last value of array field, how to extract from it, and put it in another new field?

Is there some -1 way to do it?

Thank you

[johnkerl]

Is there some -1 way to do it?

@aborruso yes, exactly:

$ echo 'input=ciao;bau;miao' | mlr --ojson put '$array=splita($input,";")'
[
{
  "input": "ciao;bau;miao",
  "array": ["ciao", "bau", "miao"]
}
]

$ echo 'input=ciao;bau;miao' | mlr --ojson put '$array=splita($input,";")[-1]'
[
{
  "input": "ciao;bau;miao",
  "array": "miao"
}
]

Please also see
https://miller.readthedocs.io/en/latest/reference-main-arrays/#negative-index-aliasing

[aborruso]

Thank you very much