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<template name="home">
  <!--
    Basically the same as doing this: (except you can't do this)
    {{#if Meteor.settings.public.instagram.access_token}}
  -->
  {{#if (meteorSettings 'instagram.access_token')}}
    <div class="instagram"></div>
  {{/if}}
  
  <!--
    You can also set Meteor.settings.public to a variable to access multiple settings
  -->
  {{#let settings=meteorSettings}}
    {{settings.instagram.access_token}}
  {{/let}}
</template>

Template.registerHelper('meteorSettings', function(settings) {
  var setting = Meteor.settings.public;
  if (settings) {
    var eachSetting = settings.split('.');
    for (i = 0; i < eachSetting.length; i++) {
      setting = setting[eachSetting[i]];
    }
  }
  return setting;
});