copy.spec.ts

import { copy } from '../../src/associative'

/**
 * tsfun | copy
 *
 * `copy` creates a shallow copy of an associative collection.
 */
describe('copy', () => {

    it('array',() =>
        expect(

            copy([2,4]))

            .toEqual([2, 4]))


    it('array instance new, instance value same',() => {

        const instance = {a: 'hey'}
        const originalColl = [instance, 4]
        const copiedColl = copy(originalColl)

        expect(copiedColl).not.toBe(originalColl)
        expect(copiedColl[0]).toBe(instance)
    })


    it('object instance new, instance value same', () => {

        const instance = {a: 'hey'}
        const originalColl = {a: instance, b: 4}
        const copiedColl = copy(originalColl)

        expect(copiedColl).not.toBe(originalColl)
        expect(copiedColl['a']).toBe(instance)
    })


    it('copy - object, keys mixed numbers and strings', () =>
        expect(

            copy({a: 1, 2: 2}))

            .toEqual({a: 1, 2: 2}))


    it('copy - retain existent keys with undefined properties', () =>

        expect(

            copy({a: 1, 2: undefined}))

            .toEqual({a: 1, 2: undefined}))
})