Existential Operator

existential operator

You can use the existential operator #? to exclude an attribute altogether if the template evaluates to a falsy value.

var data = {
  notifications: {
    home: 1,
    invite: 2
  }
};
var template = {
  tabs: [{
    text: "home",
    badge: "{{#? notifications.home}}"
  }, {
    text: "message",
    badge: "{{#? notification.message}}"
  }, {
    text: "invite",
    badge: "{{#? notification.invite}}"
  }]
}

Select and transform

ST.select(template)
    .transform(data)
    .root();

Get the result

{
  tabs: [{
    text: "home",
    badge: 1
  }, {
    text: "message"
  }, {
    text: "invite",
    badge: 2
  }]
}