Javascript pipeline operator using global mutable underline (_) variable

pipeline.js

const envars = { secret: "hello world" }

const stringifyEnv = (env) => {
  _= env
  _= Object.keys(_)
  _= _.map(envar => `${envar}=${envars[envar]}`)
  _= _.join('&')
  return _
}

console.log(stringifyEnv(envars))