How To Create 2d Array From Object (key, Value Par)

For example, I have object: o = {a: 1, b: 2, c: 3} and I need to write function that returns 2d array: arr = [['a', 'b', 'c'], [1, 2, 3]]; For now I have function that creates si

Solution 1:

I will go the library approach since everyone wrote their take on the subject, using underscore's _.keys and _.values

_.keys(o);

will return o keys, while

_.values(o)

will return o values. So from here you could do

arr = [_.keys(o), _.values(o)]

Solution 2:

There needs to be three arrays, an outer array that contains two arrays at indexes 0 and 1. Then just push to the appropriate array:

functionkeysAndValues(data){
  var arr= [[],[]]; //array containing two arrays
  for(key in data)
  {   
      arr[0].push(key);
      arr[1].push(data[key]);
  }
  return arr;
};

JS Fiddle:http://jsfiddle.net/g2Udf/

Solution 3:

You can make arr an array containing initially 2 empty arrays, then push the elements into those arrays.

functionkeysAndValues(data) {
  var arr = [[], []];
  for (key in data) {
    if (data.hasOwnProperty(key)) {
      arr[0].push(key);
      arr[1].push(data[key]);
    }
  }
  return arr;
}

Solution 4:

functionkeysAndValues(o){
var arr = newArray([] ,[]); 
for(key in o)
  {   
    arr[0].push(key);
    arr[1].push(o[key]);

  }
return arr;
};

You basically want an array containing two arrays: 0: all keys 1: all values

So push all keys into arr[0] and all values into arr[1]

Solution 5:

You can use a for in loop to iterate over your object, add the keys and values to individual arrays, and return an array containing both of these generated arrays:

var o = {a: 1, b: 2, c: 3}

functionkeyValueArray (o) {
  var keys = [];
  var values = [];

  for (var k in o ) {
    keys.push(k);
    values.push(o[k]);
  }
  return [keys,values]
}

keyValueArray(o);

jsfiddle