el-arroyo-builder.js

      function aUser() {
        let user = {
          id: 1,
          name: "Default",
          lastname: "irrelevant",
          email: "irrelevant",
          phone: "irrelevant",
          address: "irrelevant"
        }
        return {
          withName(name) {
            user.name = name
            return this
          },
          withEmail(email) {
            user.email = email
            return this
          },
          build() {
            return user
          }
        }
      }

      const user = aUser().withName("Jesús").withEmail("jesus@gmail.com").build();