Using OpenAF’s merge

OpenAF includes a base function to help on the task of merging maps. Let’s consider a simple example:

var source = {
   x: 1,
   y: -1
}

And you want to merge it with a map with the extra keys you need:

var extra = {
   z: -5
}

Now to merge the two maps simply execute:

> merge(source, extra)
{ 
   x: 1,
   y: -1,
   z: -5
}

Merging into arrays

Now imagine that instead of one map you have an array of maps? No problem, merge will merge with every single map part of the array of maps.

var source = [{
   x: 1,
   y: -1
}, {
   x: -5,
   y:-5
}];

var extra = { 
   z: -10
};

sprint(merge(source, extra))

// The result will be:
//[{
//   x: 1,
//   y -1,
//   z: -10
//},{
//   x: -5,
//   y: -5,
//   z: -10
//}]

Note: the keys of the second parameter map will always override the equivalent keys on the source (either in map or array mode).