Clarification on functions as context

[thegrandpoobah]

According to the spec (from the section YAML, not mentioned in interpolation YAML):

5) Otherwise, the data is the value returned by calling the method with the given name.

So the following invocation:

Mustache.render('{{foo}}', { foo: function() { return null; } });

Would render out as (at least in JavaScript anyways) null the way I am interpreting the spec. But that seems a little on the sub-optimal side. Did I mis-interpret the sepc or is this another one of those language dependent traps?

Thanks for the clarification.

[jgonggrijp]

You interpreted the spec correctly, at least in the sense that the returned value is used for interpolation. That template, given those data, will render `` (the empty string) rather than null, because of this spec:

spec/specs/interpolation.yml

Lines 104 to 108 in 982aa9b

	- name: Basic Null Interpolation
	desc: Nulls should interpolate as the empty string.
	data: { cannot: null }
	template: "I ({{cannot}}) be seen!"
	expected: "I () be seen!"

What do you mean by "sub-optimal"? What would be more optimal in your opinion?