遍历JSON

Question

I know immediately this is going to be such a simple answer, but my issue here has been when I'm searching for help I can't quite get the search I'm looking for.

So I understand basics of how to iterate over a JSON array. But I want something like the code below to work where what follows 'finaldataset[i]' is a variable rather than a key in the JSON.

function iterateOverJSON(s){
for(var i = 0; i<finaldataset.length; i++){
 console.log(finaldataset[i].s)
}
    }

Say finaldataset is an array of movies and attributes about each movie I want to be able to pass the function a value, say "director" or "movieLength", anyway you get the point. Many thanks for any help

Answer 1

Use brackets

function iterateOverJSON(s){
  for(var i = 0; i<finaldataset.length; i++){
   console.log(finaldataset[i][s])
  }
}

Answer 2

I think you're looking for Array.prototype.map . For example:

function iterateOverJSON(prop) {
    return finaldataset.map(function(x) { return x[prop]; });
}

// example usage
var directors = iterateOverJSON('director');
var movieLength = iterateOverJSON('movieLength');