How to call native es6 template string replacement from tag function?

Question

I\'m writing a es6 tag function for template literals, which first checks a condition in the string and, if the condition isn\'t found, merely interprets the template litera

Answer 1

There is no such builtin function - untagged template literals are just evaluated straight to strings.

is there a faster way?

That depends a lot on the implementation. In case you are using a transpiler, I would avoid using rest parameters, iterators and for of loops:

function template(strs) {
    var result = strs[0];
    for (var i=1; i < strs.length; i++) {
        result += arguments[i];
        result += strs[i];
    }
    return result;
}