updeep-remeda/test/map-spec.js
2020-04-02 15:16:13 +01:00

76 lines
1.6 KiB
JavaScript

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
})
})