Changing an array to an object

Question

My question is it possible to change and array into an object?

The following code counts the number of occurrences of each word in an array.

// function for getting the frequency of each word within a string
function getFreqword(){
  var string = tweettxt.toString(), // turn the array into a string
      changedString = string.replace(/,/g, " "), // remove the array elements 
      split = changedString.split(" "), // split the string 
      words = []; 

  for (var i=0; i<split.length; i++){
    if(words[split[i]]===undefined){
      words[split[i]]=1;
    } else {
      words[split[i]]++;
    }
  }
  return words;
}

Is it possible to change it so that instead of returning an array like this:

[ Not: 1,
  long: 1,
  left: 2,
  grab: 1,
  an: 4,
  Easter: 5,
  bargain: 1,]

instead it returns an object like this? { word: 'Not' num: 1 } etc.

You can assign object properties with bracket notation. var obj = {}; then dot notation add a property obj.prop1 = 2; or bracket notation like obj["prop2"] = 2; the handy thing is that bracket notation can use a string thus var propName = "prop3" then obj[propName] = 2; giving obj.prop3 === 2 as true. — Blindman67
– Blindman67, Commented Mar 29, 2016 at 16:41
I suppose what you really want is an array of objects : [ { word: 'Not', num: 1 }, { word: 'long', num: 1 }, ... ] rather than a single object. — Arnauld
– Arnauld, Commented Mar 29, 2016 at 16:45
@Andy tweetxt is and array that is then turned into a string that can be sorted — user4357505
– user4357505, Commented Mar 29, 2016 at 16:48
@Arnauld If I can sort that array by the num element of the object then yes. — user4357505
– user4357505, Commented Mar 29, 2016 at 16:49

Nina Scholz · Accepted Answer · 2016-03-29 17:05:43Z

2

You can use Object.key() and Array#map() for converting an object into an array of objects.

var obj = { Not: 1, long: 1, left: 2, grab: 1, an: 4, Easter: 5, bargain: 1 },
    array = Object.keys(obj).map(function (k) { return { word: k, num: obj[k] }; });

document.write('<pre>' + JSON.stringify(array, 0, 4) + '</pre>');

// edit sorting

array.sort(function (a, b) { return a.num - b.num; });
document.write('<pre>' + JSON.stringify(array, 0, 4) + '</pre>');

edited Mar 29, 2016 at 17:05

answered Mar 29, 2016 at 16:52

Nina Scholz

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