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function last(array) {  return array[array.length - 1];}
let brackets = {  /**   * Parse string to nodes tree   */  parse(str) {    let current = [""];    let stack = [current];
    for (let sym of str) {      if (sym === "(") {        current = [""];        last(stack).push(current);        stack.push(current);        continue;      }
      if (sym === ")") {        stack.pop();        current = last(stack);        current.push("");        continue;      }
      current[current.length - 1] += sym;    }
    return stack[0];  },
  /**   * Generate output string by nodes tree   */  stringify(ast) {    let result = "";    for (let i of ast) {      if (typeof i === "object") {        result += `(${brackets.stringify(i)})`;        continue;      }
      result += i;    }    return result;  },};
export default brackets;