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Mustache JS and singular/plural
{'joined':1} // ajax responde data json.

var myTemplate = '{{ joined }} person joined so far.'

var json = {
    'joined': 1,
    'ppl': function() {
        return (this.joined === 1) ? 'person' : 'people'
    }
} // ajax responde data json.
var myTemplate = '{{ joined }} {{ppl}} joined so far.'

Mustache.to_html(myTemplate, json);

var json = { 'joined': 1 };
var template = json.joined +' '+ ((json.joined === 1) ? 'person': 'people') +' joined so far.';