import { expect } from 'chai' import u from '../lib' describe('updeep', () => { it('does not change anything if no updates are specified', () => { const object = { foo: 3, bar: [7, 5] } const result = u({}, object) expect(result).to.equal(object) }) it('can update with fixed values', () => { const object = { foo: 3, bar: [7, 5] } const result = u({ foo: 4 }, object) expect(result).to.deep.equal({ foo: 4, bar: [7, 5] }) }) it("returns the same instance if an update doesn't make changes", () => { const object = { foo: 3 } const result = u({ foo: 3 }, object) expect(result).to.equal(object) }) it('can update a nested structure', () => { const object = { foo: { bar: 7, bam: 3 }, baz: 32 } const result = u({ foo: { bar: 8 } }, object) expect(result).to.deep.equal({ foo: { bar: 8, bam: 3 }, baz: 32 }) }) it('can update arrays', () => { const object = [1, 2, 3] const result = u({ 1: 7 }, object) expect(result).to.deep.equal([1, 7, 3]) }) it('replaces the object outright if updates are a constant', () => { expect(u(3, {})).to.equal(3) expect(u(null, {})).to.be.null }) it('can add an element to an array', () => { const object = [] const result = u({ 0: 3 }, object) expect(result).to.eql([3]) }) it('can update nested arrays', () => { const object = { foo: [1, 2, 3], bar: 9 } const result = u({ foo: { 1: 7 } }, object) expect(result).to.deep.equal({ foo: [1, 7, 3], bar: 9 }) }) it('can use functions to update values', () => { const inc = i => i + 1 const object = { foo: 3, bar: 4, baz: 7 } const result = u({ foo: inc, bar: inc }, object) expect(result).to.deep.equal({ foo: 4, bar: 5, baz: 7 }) }) it('can be partially applied', () => { const inc = i => i + 1 const object = { foo: 3 } const incFoo = u({ foo: inc }) const result = incFoo(object) expect(result).to.deep.equal({ foo: 4 }) }) it('passes additional arguments on to updates if it is a function', () => { const func = (_, x) => x const result = u(func, 0, 4) expect(result).to.equal(4) }) it('can update if the value is an array', () => { const object = {} const result = u({ foo: [0, 1] }, object) expect(result).to.deep.equal({ foo: [0, 1] }) }) it('can update when original object is undefined', () => { const result = u({ foo: [0, 1] }, undefined) expect(result).to.deep.equal({ foo: [0, 1] }) }) it('can take a function as the updater', () => { const result = u(i => i + 1, 7) expect(result).to.eql(8) }) it('deeply freezes the result', () => { const result = u({ foo: { bar: 3 } }, { foo: { bar: 0 } }) expect(Object.isFrozen(result)).to.be.true expect(Object.isFrozen(result.foo)).to.be.true }) it('assigns null values', () => { expect(u({ isNull: null }, {})).to.eql({ isNull: null }) }) it('can use a placeholder to partially apply', () => { function increment(i) { return i + 1 } const updateJoe = u(u._, { name: 'Joe Merrill', age: 21 }) const result = updateJoe({ age: increment }) expect(result).to.eql({ name: 'Joe Merrill', age: 22 }) }) it('defaults to an empty object when null or undefined', () => { let result = u({ a: { b: 0 } }, { a: null }) expect(result).to.eql({ a: { b: 0 } }) result = u({ a: { b: 0 } }, { a: undefined }) expect(result).to.eql({ a: { b: 0 } }) result = u({ a: { b: 0 } }, {}) expect(result).to.eql({ a: { b: 0 } }) }) it('preserves empty objects when empty updates are specified', () => { const result = u({ a: {} }, {}) expect(result).to.eql({ a: {} }) }) it('works with date objects', () => { const date = new Date() const result = u({ created: date }, {}) expect(result).to.eql({ created: date }) }) const expectU = (update, orig, expected) => expect(update(orig)).to.eql(expected) describe('u.omitted', () => { it('omit properties via u.omitted', () => { expectU(u({ a: u.omitted, b: i => i + 1 }), { a: 1, b: 2 }, { b: 3 }) }) it('omit array and object properties', () => { expectU( u({ a: u.omitted, b: 'stuff', c: u.omitted }), { a: [1, 2, 3], b: 'orig', c: { z: 'bar' } }, { b: 'stuff' } ) }) it('deep omit', () => { expectU( u({ a: { b: u.omitted, c: 'stuff' } }), { a: { b: 'foo', z: 'bar' } }, { a: { z: 'bar', c: 'stuff' } } ) }) it('omitting an array item filters it out', () => { expectU(u({ 1: u.omitted }), ['a', 'b', 'c'], ['a', 'c']) }) }) })