It's worth noting that #if, #each etc. are not built-in structures. They are simply helpers that you can register in the host language. Block helpers receive th

It's worth noting that #if, #each etc. are not built-in structures. They are simply helpers that you can register in the host language. Block helpers receive the block as a function that can be invoked as though it was a top-level template. Consider the simple #with helper: Handlebars.registerHelper('with', function(object, options) { // invoke the sub-template passed as a block to the with helper with the object parameter return options.fn(object); }); And its usage: {{#with person}} Name: {{name}} {{/with}} This means that you can build arbitrary control structures and iterators in the host language and expose them to Handlebars.