castaway

castaway

cast an object's values to a specified schema

npm install castaway

Given an object, and a schema defining the types of the objects properties, castaway will convert the values to the appropriate JS primitives.

var cast = require('castaway');

var obj = { foo: '1337'},
	schema = { foo: { type: Number }};

cast(obj, schema);

console.log(typeof obj.foo); // number

Supported type values are:

• Number
• Boolean
• Date
• Array (converts a CSV string into an Array)

Arrays also support defining member schemas via an each property, and specifying the schema or types:

Here's an example of specifying the schema via each for an array...

var schema = {
		foo: {
			type: Array,
			each: {
				schema: {
					id: { type: Number },
					when: { type: Date }
				}
			}
		}
	},
	obj = { foo: [
		{ id: '1', hee: 'haw', when: '2013-02-28 16:31:13' },
		{ id: '2', hee: 'hoo', when: '2013-02-28' }
	]};

	cast(obj, schema);
	// for each entry in foo, id is a Number, when is a Date, hee is still a String

And here's an example of just specifying the type for an array via each...

var schema = { foo: { type: Array, each: { type: Number } } },
	obj = { foo: '1,2,3,4,5,6,7,8,9' };

cast(obj, schema);
// foo is an array of numbers