Positional index in Ember.js collections iteration

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It’s old question but still gets a lot of hits. In the current version of Ember.JS one can use _view.contentIndex to display current index inside the loop.

{{#each}}
    Index: {{_view.contentIndex}}
{{/each}}

If you need an adjusted index (for instance starting from 1) then there is a possibility of creating reusable helper increment

Ember.Handlebars.registerBoundHelper('increment', function(integer) {
    return integer + 1;
});

then you would use it in the following way

{{#each}}
    Index: {{increment _view.contentIndex}}
{{/each}}

Update

Starting with ember 1.11 you can do as well

{{#each people as |person index|}}
   Index: {{increment index}}
{{/each}}

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