Rendering

gistfile1.js

// require hogan
var hogan = require("hogan.js");

// compile template
var template = hogan.compile("@{{name}}");

var team = ['dhg', 'fat', 'jimio', 'nickgreen', 'sayrer'];

team.map(function (twitterer) {
 
  // Render context to template
  return template.render({name: twitterer });

});

// outputs "Follow: @dhg @fat @jimio @nickgreen @sayrer!"
console.log('Follow: ' + team.join(' ') + '!');

You cannot use team.map() without an assignment to a new variable, because after this team self never changes. Then the team.join() will not be expected.

Try this one:

// require hogan
var hogan = require("hogan.js");

// compile template
var template = hogan.compile("@{{name}}");

var team = ['dhg', 'fat', 'jimio', 'nickgreen', 'sayrer'];

var mappedTeam = team.map(function (twitterer) {

// Render context to template
return template.render({name: twitterer });

});

// outputs "Follow: @dhg @fat @jimio @NickGreen @sayrer!"
console.log('Follow: ' + mappedTeam.join(' ') + '!');

// require hogan
var hogan = require("hogan.js");

// compile template
var template = hogan.compile("@{{name}}");

var team = ['dhg', 'fat', 'jimio', 'nickgreen', 'sayrer']
           .map(function (twitterer) {

             // Render context to template
             return template.render({name: twitterer });

           });

// outputs "Follow: @dhg @fat @jimio @nickgreen @sayrer!"
console.log('Follow: ' + team.join(' ') + '!');