Pipeline operator

Pipelines let you pass the result of an expression into another expression with multiple steps and without intermediate variables.

Type	TC39	MDN	CoreJS	Babel	Civet	JS+
Syntax	✅ Stage 2 View	❌	❌	✅ View	✅ View	✅ via Babel

JS+ TypeScript

Object.keys(envars)
  .map(envar => `${envar}=${envars[envar]}`)
  .join(' ')
  |> `$ ${%}`
  |> chalk.dim(%, 'node', args.join(' '))
  |> console.log(%)

console.log(
  chalk.dim(
    `$ ${Object.keys(envars)
      .map(envar =>
        `${envar}=${envars[envar]}`)
      .join(' ')
    }`,
    'node',
    args.join(' ')
  )
);

Source

Integration

This syntax is integrated with Babel’s plugin-proposal-pipeline-operator plugin.

---

Resources