Create a universal helper variable

Question

Is there a way to create a variable at the top of template helpers to remove duplication.

In this particular situation I'm using var candidate = FlowRouter.getParam('id'); and I have to create the variable in each helper. I assume there is a better way.

professionalOverview: function() {
    var candidate = FlowRouter.getParam('id');
        return ProfessionalOverview.findOne({ candidateUserId: candidate });
    },
  candidateImg: function() {
    var candidateUserId = FlowRouter.getParam('id');

    return Files.findOne({ userId: candidateUserId });
  },

EDIT

Template.talentProfileNew.onCreated(function() {
    var self = this;
    self.autorun(function(){
        this.candidateUserId = new ReactiveVar(FlowRouter.getParam('id'));
    }
});

Template.talentProfileNew.helpers({
  candidate: function() {
    console.log(Template.instance().candidateUserId.get());

    return Meteor.users.findOne({_id: Template.instance().candidateUserId.get()});
  }
});

Answer 1

you could read it once in onCreated() and put it in a reactive var. e.g.

Template.Foo.onCreated(function() {
    this.candidateUserId = new ReactiveVar(FlowRouter.getParam('id'));
});

Template.Foo.helpers({
    candidateImg() {
        return ProfessionalOverview.findOne({ userId: Template.instance().candidateUserId.get()});
    }
});