how to interchange object key value in javascript code example

Example 1: swap key value object javascript

function swap(json){
  var ret = {};
  for(var key in json){
    ret[json[key]] = key;
  }
  return ret;
}

Example 2: reverse keys and values in object javascript

var object = { 'a': 1, 'b': 2, 'c': 1 };
//This uses the package lodash

  _.invert(object);
  // => { '1': 'c', '2': 'b' }

  // with `multiValue`
  _.invert(object, true);
  // => { '1': ['a', 'c'], '2': ['b'] }