updeep-remeda/test/map-spec.js

import { expect } from 'chai'
import u from '../lib'

describe('u.map', () => {
  it('applies updates to each item in an array', () => {
    const object = [0, 1, 2]
    const inc = (x) => x + 1
    const result = u.map(inc, object)

    expect(result).to.eql([1, 2, 3])
  })

  it('applies updates to each value in an object', () => {
    const object = { a: 0, b: 1, c: 2 }
    const inc = (x) => x + 1
    const result = u.map(inc, object)

    expect(result).to.eql({ a: 1, b: 2, c: 3 })
  })

  it('can update with a regular updates object', () => {
    const object = [{ a: 0 }, { a: 0 }]
    const result = u.map({ a: 1 }, object)

    expect(result).to.eql([{ a: 1 }, { a: 1 }])
  })

  it('returns the same object if no updates are made', () => {
    const array = [0, 1]
    const ident = (x) => x
    let result = u.map(ident, array)

    expect(result).to.equal(array)

    const object = { a: 0 }
    result = u.map(ident, object)

    expect(result).to.equal(object)
  })

  it('passes the key or index as the second parameter to the iteratee', () => {
    const object = {
      a: { x: 0 },
      b: [3, 3],
    }
    const setToKey = (_, key) => key
    const result = u.map(u.map(setToKey), object)

    expect(result).to.eql({
      a: { x: 'x' },
      b: [0, 1],
    })
  })

  it('can be partially applied', () => {
    const object = {
      b: [3, 3],
    }
    const setToKey = (_, key) => key
    const result = u(
      {
        b: u.map(setToKey),
      },
      object
    )

    expect(result).to.eql({
      b: [0, 1],
    })
  })

  it('freezes the result', () => {
    expect(Object.isFrozen(u.map({}, {}))).to.be.true
  })
})