Looping through a multidimensional array in Handlebars.js

In this particular case if you want to render just "123" you can do this:

{{#each userSurvey}}
    {{this.[0]}}
{{/each}}

Or even simpler, because arrays automatiaclly transform to strings:

{{#each userSurvey}}
    {{this}}
{{/each}}

You'd have to loop 2 times:

{{#each userSurvey}}
  {{#each this}}
    {{ this }}
  {{/each}}
{{/each}}