Mapping serialized tuples (F#) to JavaScript objects

gistfile1.js

// response from server 
// "[{"item1":{"id":"ce957038-fed0-4c09-8594-5475efcac4d3","name":"https://github.com/liammcl..."},"item2":3}, ...]"

doSomethingAjaxing().then(mapSerializedTuples.bind(null, ['deck', 'count']));

// after mapping
// "[{"deck":{"id":"ce957038-fed0-4c09-8594-5475efcac4d3","name":"https://github.com/liammcl..."},"count":3}, ...]"

function mapSerializedTuple(keyNames) {
	return function (tuple) {
	    var o = {};
	    keyNames.forEach(function (key,i) {
	        o[key] = tuple['item' + (i+1)];
	    });
	    return o;
	};
}

function mapSerializedTuples(keyNames, tuples) {
	return tuples.map(mapSerializedTuple(keyNames))
}