Crafting a query string from an array using ES6's template literal feature

makeQueryString.ts

/**
 * Template String Tag (For crafting query-string for HTTP/Get from a array)
 *
 * Usage: qsTag`${['a','b','c','d']}`(); // a=b&c=d
 */
export const qsTag = (strings, ...keys) => (...values) => {
  let result = [];
  const input = keys[0];
  input.forEach((key: any, i: number, ary: any[]) => {
    const postfix = (ary.length-1 === i ? '' : '&');
    if (i > 0 && i % 2 === 1) {
      result.push(`${input[i-1]}=${input[i]}${postfix}`);
    }
  });
  return result.join('');
};