Handlebars

Handlebars:

Template

{{#each people}}
   {{print_person}}
{{/each}}

Preparation-Script

Handlebars.registerHelper('print_person', function () {
    return this.firstname + ' ' + this.lastname
})

Input

{
  people: [
    {
      firstname: "Nils",
      lastname: "Knappmeier",
    },
    {
      firstname: "Yehuda",
      lastname: "Katz",
    },
  ],
}

Output

   Nils Knappmeier
   Yehuda Katz