Working with arrays

sift-r 📥 docs

import { sift, byPattern } from 'sift-r'

Working with arrays

byPattern()

import { byPattern } from 'sift-r'

const filtered = [
  { user: 'barney', age: 36, active: false },
  { user: 'fred', age: 40, active: true },
  { user: 'pebbles', age: 1, active: false }
].filter(byPattern({ age: 36 }))

// filtered ===
//   [
//     { user: 'barney', age: 36, active: false }
//   ]

import { pluck, isNumber } from 'match-iz'

const mapped = [
  { user: 'barney', age: 36, active: false },
  { user: 'fred', age: 40, active: true },
  { user: 'pebbles', age: 1, active: false },
  { user: '', age: 'not-a-number', active: true }
].map(byPattern({ age: pluck(isNumber) }))

// mapped === [36, 40, 1, undefined]

sift()

sift([[pattern, value], [pattern, value], ...])

// 5:
//
const [strValues, theRest] = sift([
  [isString, 'header'],
  [isString, 1],
  [isString, '# header']
])

sift([value, value], [pattern, pattern])

// 6:
//
const [strValues, theRest] = sift(
  ['header', 1, '# header'],
  [isString, isString, isString]
)

sift([value, value], value-pattern)

// 7:
//
const [strValues, theRest] = sift(
  ['header', 1, '# header'],
  isString
)

sift([value, value], ...value-patterns)

// 8:
//
const [strValues, numValues, theRest] = sift(
  ['header', 1, '# header', 2, false, true],
  isString,
  isNumber
)