Using apply on an array of objects in a json - json

Question

I have a json which I am reading in R and converting to a list object. For a key "metrics", there is an array of multiple objects of the same type.
Json structure:
{"metrics":[{"metricName":"abc",
"metricType":"def"
},
{"metricName":"ghi",
"metricType":"jkl"
}]
}
This is how my list object looks like:
$metrics
$metrics[[1]]
$metrics[[1]]$metricName
[1] "abc"
$metrics[[1]]$metricType
[1] "def"
$metrics[[2]]
$metrics[[2]]$metricName
[1] "ghi"
$metrics[[2]]$metricType
[1] "jkl"
I want to apply a function (someFunc) to each object of the array. $metrics[[1]],$metrics[[2]]. How can this be done using apply family of functions?
somefunc(x){return(list(x$metricName,x$metricType)}
I tried concatenating like this:
lapply(lapply(metrics,"["),someFunc)
This does not throw an error but gives empty lists as output. The someFunc expects x$metricName,x$metricType objects to process. But using "[" does not render that kind of object I guess. Can this be handled using the apply functions?

Answer 1

Can you explici what your function someFunc is doing (and its parameters)?
This is working for me
someFunc=function(metricName,metricType){
return(paste(metricName,metricType))
}
metrics=list(list(metricName="abc",metricType="m"),
list(metricName="gg",metricType="L"))
lapply(metrics,FUN=function(el){someFunc(el$metricName,el$metricType)})
(use sapply eventually if you want to have a vector.