fence.js/examples/extend.js

const FenceBuilder = require('fence.js@1.0.0'); // Const's get this show on the road! let FB = new FenceBuilder(); // Create a prototype method that will call a function which performs a strict // comparison of two values. `val1` will be set to a constant value after the // validation has been forkd. FB = FB.register(function strictEqual(val1, val2) { return val1 === val2; }, 'strictEqual'); // `fork()` creates a copy of a `FenceBuilder` that you can extend let original = FB.fork(); // `FenceBuilder` methods return a reference to `this` to facilitate function // chaining. if you do not want to chain functions, make sure to store the reference original = original.strictEqual('a'); // Create a copy of the `original` validation then add an additional test for 'b' let extended = original.fork().strictEqual('b'); // We can add additional methods to an extended validation via `.register()` extended = extended.register(function() { return true; }, 'alwaysTrue').alwaysTrue(); // Function chaining ftw! // consts create a third order validation and test for 'c' const moreExtended = extended.fork().strictEqual('c'); // The value we will be testing const val = 'a'; console.log(original, extended, moreExtended);

// Once a validation is compconste, `.build()` will create an instance of `Fence` // (*not* `FenceBuilder`) which would typically be exported for use by other // code. here we are going to build them and run them all at once to see the output. const validations = [ original.build(), extended.build(), moreExtended.build() ].map(function(validation) { return validation.run(val); }); // We'll now print the results returned from the validations of the value 'a' validations.forEach(function(result) { console.log(`result: `, result); console.log(`for any: `, result.forAny()); });