map-step-comp

map.ts

    const a = [
      { name: 'a', age: 10 },
      { name: 'b', age: 20 },
    ]

    a.map((p) => {
      const len = p.name.length
      const id = `${p.name}-${p.age}`
      const ageDouble = p.age * 2

      return { p, len, id, ageDouble }
    })

    a.map((p) => [
      p.name.length,
      `${p.name}-${p.age}`,
      p.age * 2,
    ]).map(([p, len, id, ageDouble]) => ({ p, len, id, ageDouble }))

    a.map((p) => ({
      p,
      len: p.name.length,
      id: `${p.name}-${p.age}`,
      ageDouble: p.age * 2,
    }))