How do I add console.log() JavaScript logic inside of a Handlebars template?

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Create a Handlebars helper in one of the client-loaded JavaScript files in your project:

Template.registerHelper("log", function(something) {
  console.log(something);
});

And then call it in your template:

{{log someVariable}}

You can log the current context with simply {{log this}}.

(Note that in Meteor before version 0.8, or in pure Handlebars outside of a Meteor app, replace Template.registerHelper with Handlebars.registerHelper.)

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