JavaScript: handlebarsHelpers

handlebarsHelpers.js

// Transform a date string into an object, e.g.
// "2014-04" -> {0:"2014", 1:"04"}
translateDate: function(format, date){
  var args = Array.prototype.slice.call(arguments);
  var dates = date.split('-');
  if(dates.length === 2){
    args.splice(1, 1, dates[0], dates[1]);
  }else if(dates.length === 3){
    args.splice(1, 1, dates[0], dates[1], dates[2]);
  }

  return translate.apply(this, args);
},

// Enhance #if to support conditional expresstion like
// {{#if a '>' b}}
ifCondition: function(a, operator, b, options){
  switch(operator){
    case '===':
      return (a === b) ? options.fn(this) : options.inverse(this);
    case '<':
      return (a < b) ? options.fn(this) : options.inverse(this);
    case '<=':
      return (a <= b) ? options.fn(this) : options.inverse(this);
    case '>':
      return (a > b) ? options.fn(this) : options.inverse(this);
    case '>=':
      return (a >= b) ? options.fn(this) : options.inverse(this);
    case '&&':
      return (a && b) ? options.fn(this) : options.inverse(this);
    case '||':
      return (a || b) ? options.fn(this) : options.inverse(this);
    case 'in':
      return (a in b.split(',')) ? options.fn(this) : options.inverse(this);
    case 'notin':
      return !(a in b.split(',')) ? options.fn(this) : options.inverse(this);
    default:
      return options.inverse(this);
  }
}