Grunt toStringify hackery

Gruntfile.js

module.exports = function(grunt) {
  function toStringify(obj, toString) {
    obj.toString = toString;
    return obj;
  }

  grunt.initConfig({
    stuff: {
      foo: ['l', 'o', 'l'],
      bar: toStringify(['w', 'u', 't'], function() {
        return this.join('-');
      }),
      baz: toStringify(['o', 'm', 'g'], function() {
        return this.join('').toUpperCase();
      }),
    },
    build: {
      options: {
        arr: ['<%= stuff.foo %>', '<%= stuff.bar %>', '<%= stuff.baz %>'],
        str: '<%= stuff.foo %> and <%= stuff.bar %> and <%= stuff.baz %>',
      },
    },
  });

  grunt.registerTask('build', function() {
    var options = this.options();
    console.log(options.arr);
    console.log(options.str);
  });
};

output.sh

$ grunt build
Running "build" task
[ [ 'l', 'o', 'l' ], [ 'w', 'u', 't' ], [ 'o', 'm', 'g' ] ]
l,o,l and w-u-t and OMG