immutable.js

immutable.js

var Block = Immutable.Record({
    id: 0,
    questions: Immutable.List(),
    subblocks: Immutable.List(),
    randomizable: true,
    ordering: false
});

var b1 = Block({id: 1});
var b2 = b1.set('randomizable', false);
var b3 = b2.set('randomizable', true);

console.log("b1 and b2:", b1 === b2);   // returns false
console.log("b1 and b3:", b1 === b3);   // also returns false

console.log("b1 and b2:", Immutable.is(b1, b2));  // returns false
console.log("b1 and b3:", Immutable.is(b1, b3));  // returns true