Extending the default Pursuit dictionary with a custom checker function.

gistfile1.js

// npm install pursuit-core
// npm install pursuit-dictionary

var pursuitCore = require('pursuit-core'),
    dictionary = require('pursuit-dictionary')
;

// add a random function to the dictionary
dictionary.random = function() {
    return 'Math.random() - 0.5 > 0 ? true : false';
}

// compile the language using the extended dictionary
var compile = pursuitCore({
    dictionary: dictionary
});

// using the new function
var customMatcher = compile({
    random: ''
});

// this list will return a list of 'foo', 'bar' and 'baz', or [] at random
console.log(['foo', 'bar', 'baz'].filter(customMatcher));