Handlebars - each with @key and @Index

handlebars-each-index-key

When looping through items in each, you can optionally reference the current loop index via {{@index}}

{{#each array}}
  {{@index}}: {{this}}
{{/each}}

For object iteration, use {{@key}} instead:

{{#each object}}
  {{@key}}: {{this}}
{{/each}}

From: http://handlebarsjs.com/