CFP - Docs - pick

pick

(keys: EntryKey[]) => (collection: EntryCollection) => EntryCollection

Pick entries from a collection by key

Try It

const obj = { a: 1, b: 2, c: 3, d: 4 }
const pickAC = pick(['a', 'c'])

pickAC(obj) // is { a: 1, c: 3 }
const obj = { a: 1, b: 2, c: 3, d: 4 }
const pickAC = pick(['a', 'c'])

pickAC(obj) // is { a: 1, c: 3 }

Try It

const obj = { a: 1, b: 2, c: 3, d: 4 }
const pickAC = pick(['a', 'c'])

pickAC(obj) // is { a: 1, c: 3 }
const obj = { a: 1, b: 2, c: 3, d: 4 }
const pickAC = pick(['a', 'c'])

pickAC(obj) // is { a: 1, c: 3 }

Sometimes we want to pick entries by key. Below, we run a restaurant and are picking our featured menu for the week. Let's choose chicken wings and the BLT wrap.

Try It

const fullMenu = {
  'chicken wings': {
    price: 16,
    description: 'One pound tossed in sauce',
  },
  'smash burger': {
    price: 15,
    description: 'A double patty with classic toppings',
  },
  'chicken sandwich': {
    price: 15,
    description: 'Blacked, fresh toppings, on ciabatta',
  },
  'blt wrap': {
    price: 14,
    description: 'The classic with bacon jam and lemon aioli',
  },
}

const pickFeaturedItems = pick(['chicken wings', 'blt wrap'])
const featuredMenu = pickFeaturedItems(fullMenu)

console.log(featuredMenu)
// prints
// {
//   chicken wings: {
//     price: 16
//     description: One pound tossed in sauce
//   },
//   blt wrap: {
//     price: 14
//     description: The classic with bacon jam and lemon aioli
//   },
// }
type Item = {
  price: number
  description: string
}
type Menu = Record<string, Item>
const fullMenu: Menu = {
  'chicken wings': {
    price: 16,
    description: 'One pound tossed in sauce',
  },
  'smash burger': {
    price: 15,
    description: 'A double patty with classic toppings',
  },
  'chicken sandwich': {
    price: 15,
    description: 'Blacked, fresh toppings, on ciabatta',
  },
  'blt wrap': {
    price: 14,
    description: 'The classic with bacon jam and lemon aioli',
  },
}

const pickFeaturedItems = pick(['chicken wings', 'blt wrap'])<Menu>
const featuredMenu = pickFeaturedItems(fullMenu)

console.log(featuredMenu)
// prints
// {
//   chicken wings: {
//     price: 16
//     description: One pound tossed in sauce
//   },
//   blt wrap: {
//     price: 14
//     description: The classic with bacon jam and lemon aioli
//   },
// }

Try It

const fullMenu = {
  'chicken wings': {
    price: 16,
    description: 'One pound tossed in sauce',
  },
  'smash burger': {
    price: 15,
    description:
      'A double patty with classic toppings',
  },
  'chicken sandwich': {
    price: 15,
    description:
      'Blacked, fresh toppings, on ciabatta',
  },
  'blt wrap': {
    price: 14,
    description:
      'The classic with bacon jam and lemon aioli',
  },
}

const pickFeaturedItems = pick([
  'chicken wings',
  'blt wrap',
])
const featuredMenu = pickFeaturedItems(fullMenu)

console.log(featuredMenu)
// prints
// {
//   chicken wings: {
//     price: 16
//     description: One pound tossed in sauce
//   },
//   blt wrap: {
//     price: 14
//     description: The classic with bacon jam and lemon aioli
//   },
// }
type Item = {
  price: number
  description: string
}
type Menu = Record<string, Item>
const fullMenu: Menu = {
  'chicken wings': {
    price: 16,
    description: 'One pound tossed in sauce',
  },
  'smash burger': {
    price: 15,
    description:
      'A double patty with classic toppings',
  },
  'chicken sandwich': {
    price: 15,
    description:
      'Blacked, fresh toppings, on ciabatta',
  },
  'blt wrap': {
    price: 14,
    description:
      'The classic with bacon jam and lemon aioli',
  },
}

const pickFeaturedItems = pick([
  'chicken wings',
  'blt wrap',
])<Menu>
const featuredMenu = pickFeaturedItems(fullMenu)

console.log(featuredMenu)
// prints
// {
//   chicken wings: {
//     price: 16
//     description: One pound tossed in sauce
//   },
//   blt wrap: {
//     price: 14
//     description: The classic with bacon jam and lemon aioli
//   },
// }