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Simple Use Cases

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Conditionally rendering content

#if blocks can be used to control whether content is rendered. 
<!-- equal -->
{{#if (condition (var "some_variable") "==" "show")}}
  <div align="center">Hello!</div>
{{/if}}

<!-- strict equal -->
{{#if (condition (var "some_variable") "===" "show")}}
  <div align="center">Hello!</div>
{{/if}}

<!-- not equal -->
{{#if (condition (var "some_variable") "!=" "hide")}}
  <div align="center">Hello!</div>
{{/if}}

<!-- greater than -->
{{#if (condition (var "some_array.length") ">" 0)}}
  <div align="center">Hello!</div>
{{/if}}

<!-- greater than or equal -->
{{#if (condition (var "some_array.length") ">=" 0)}}
  <div align="center">Hello!</div>
{{/if}}

<!-- less than -->
{{#if (condition (var "some_array.length") "<" 0)}}
  <div align="center">Hello!</div>
{{/if}}

<!-- less than or equal -->
{{#if (condition (var "some_array.length") "<=" 0)}}
  <div align="center">Hello!</div>
{{/if}}

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Pluralizing Text

The formatMessage helper can be used to pluralize text in rendered content. Pluralization respects the ICU format and entries follow Unicode CLDR rules. Example 
Your list contains
{{formatMessage
  "{itemCount, plural,
    =0 {no items}
    one {# item}
    other {# items}
}"
  itemCount=itemCount
}}.

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Setting Variables in the payload

Using a Handlebars block, you can transform and set a variable, which can then be used in a template 
{{ set "number_rounded (round (var "data.number" )) }}
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Using the intl block for localization

You can wrap Handlebars functions with the intl block in order to access internationalization features including currency, number formatting and dates. See Handlebars-intl for more information. 
{{#intl formats=intl.formats locales="en-US"}}
  {{set
    "winPct_formatted"
    (formatMessage "{winPct, number, maximumFractionDigits=2}" winPct=(var "data.winPct"))
  }}
{{/intl}}