Renders a template string based on positional and keyword arguments.

template.js

/**
* Renders a template string based on positional and keyword arguments.
* Source: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals
* @example
* // returns 'YAY!'
* let t1Closure = template`${0}${1}${0}!`;
* t1Closure('Y', 'A');
* @example
* // returns 'Hello World!'
* let t2Closure = template`${0} ${'foo'}!`;
* t2Closure('Hello', {foo: 'World'});
* @example
* // returns 'value'
* let t3Closure = template`${'foo.bar'}`;
* t3Closure({foo:  { bar: 'value' }  });
*/
function template(strings, ...keys) {
    return ((...values) => {
        let dict = values[values.length - 1] || {};
        let result = [strings[0]];
        keys.forEach((key, i) => {
            let value;
            if(Number.isInteger(key)){
                value = values[key];
            }
            else{
                let keyLayers = key.split('.');
                value = dict;
                for(kL of keyLayers){
                    value = value[kL];
                }
            }
            result.push(value, strings[i + 1]);
        });
        return result.join('');
    });
}