router_resovle.js

const { deepEqual } = require("assert");

/**
 * router path resolver
 * @param {string} path
 * @param {{[key: string]: string}} data
 */
const router = (path, data) => {
  for (const [key, value] of Object.entries(data)) {
    path = path.replace(new RegExp(":" + key, "g"), value);
  }
  return path;
};

const testData = [
  {
    param: {
      path: "/app/:name/:age",
      data: {
        name: "test",
        age: "10"
      }
    },
    want: "/app/test/10"
  },
  {
    param: {
      path: "/app/:name/:age/:name",
      data: {
        name: "test",
        age: "10"
      }
    },
    want: "/app/test/10/test"
  }
];

for (const { param, want } of testData) {
  const { path, data } = param;
  const got = router(path, data);
  deepEqual(got, want, `want: ${want} but got ${got}`);
}