gistfile1.txt

var ABRecord = Immutable.Record({a:1, b:2, c : null});
var myRecord1 = new ABRecord(Immutable.fromJS({a:2, b: 4, c: { d: ["one"]}}));
var myRecord2 = new ABRecord(Immutable.fromJS({a:2, b: 4, c: { d: ["one"]}}));
console.log(Immutable.is(myRecord1, myRecord2));

console.log(myRecord1.c.get("d").get(0));

///
var NestedRecord = Immutable.Record({d : null});
var ABRecord1 = Immutable.Record({a:1, b:2, c : null});
var myRecord3 = new ABRecord1(Immutable.fromJS({a:2, b: 4, c: new NestedRecord({ d: "one"})}));
var myRecord4 = new ABRecord1(Immutable.fromJS({a:2, b: 4, c: new NestedRecord({ d: "one"})}));
console.log(Immutable.is(myRecord3, myRecord4));

console.log(myRecord3.c.d);

////
var NestedRecord = Immutable.Record({d : null});
var ABRecord1 = Immutable.Record({a:1, b:2, c : null});
var myRecord3 = new ABRecord1(Immutable.fromJS({a:2, b: 4, c: new NestedRecord({ d: "one"})}));
var myRecord4 = new ABRecord1(Immutable.fromJS({a:2, b: 4, c: new NestedRecord({ d: "one"})}));
console.log(Immutable.is(myRecord3, myRecord4));

console.log(myRecord3.c.d);