Serializable class in ES6

Use case

Its common scenario in javscript development where we want to store js object into file/string. Js provides a powerfull built-in format JSON. However by default json format cannot contain arbitary type of object. Also restoring of original object needs little bit of work. Serializable class help you in this regard- serlizing and deserializing of javascript object in json format.

General Use

var ast = {};

class expression extends Serializable {
    factory() {
        return ast;
        }
}
class unaryExpression extends expression {
    constructor(operator, left) {
        super();
        this.argument = left;
        this.operator = operator;
    }
}

ast.expression = expression;
var str = JSON.stringify(anExpression.toJson(), null, 2);

//Deserialzing
var createdExpression = Object.create(expression.prototype);
createdExpression.fromJson(JSON.parse(str));

Alternate to subclassing

class expression {
    factory() {
        return ast;
    }
}

Serializable.mixin(expression.prototype);
`

With explcit attributes for serialization.

class unaryExpression extends expression {
    constructor(operator, left) {
        super();
        this.argument = left;
        this.operator = operator;
    }
    serialize(){
        return super.serialize().add('left','operator');
    }
}

Unit Tests

For now, a basic test has been implmneted using ast/expression as example.

npm test

TODO

• Support for cyclic object reference
• Add more test cases