Handlebars {{#and}} helper. When you need variable amount of values to AND together.

helper.js

// var context = {foo: true, bar: false, baz: true}
// {{#and foo baz}}Yup{{else}}Nope{{/and}} -> Yup
// {{#and bar baz qux}}Yup{{else}}Nope{{/and}} -> Nope

Handlebars.registerHelper('and', function() {
  var fncType = toString.call(function(){});
  for (var i = 0; i < arguments.length - 1; i++) {
    var arg = arguments[i];
    if (toString.call(arg) === fncType) {
      arg = arg.call(this);
    }
    if (!arg || Handlebars.Utils.isEmpty(arg)) return arguments[arguments.length - 1].inverse(this);
  }
  return arguments[arguments.length - 1].fn(this);
});