Ability to make it even more nano without any issues

[TedMN]

Just looked at nano.js and you could easily make it several characters. It is interesting that you spend time making should you do not output null or undefined, but don't check that undefined[keys[]] or null[keys[]] is not protected, you could put it in the while(i < l && ...) adds code though.

function nano(template, data) {
return template.replace(/{([\w.]*)}/g, function(str, key) {
var keys = key.split("."), v = data[keys.shift()], i = 0, l = keys.length;
while(i < l) v = v[keys[i++]];
//simple while, hoisted variables up to avoid extra 'var', increment on use
return (typeof v == "undefined" || v == null) ? '' : v;
//change double negative save two chars.
});
}

Just sharing what I happen to see, really not any issue and I can close out either way.

[TedMN]

Not critical and 6 years old