1- const arrayToTransform = [ 1 , 2 , 3 ]
2- const listToTransform = {
3- value : 1 ,
4- rest : {
5- value : 2 ,
6- rest : {
7- value : 3 ,
8- rest : null ,
9- } ,
10- } ,
11- }
12- 13- // Part 1
14- const arrayToList = array => {
1+ export const arrayToList = array => {
152 let list = { }
163 const lastIndex = array . length - 1
174
@@ -25,10 +12,8 @@ const arrayToList = array => {
2512
2613 return list
2714}
28- console . log ( arrayToList ( arrayToTransform ) ) // => { value: 1, rest: { value: 2, rest: { value: 3, rest: null }}}
2915
30- // Using while
31- const listToArray = list => {
16+ export const listToArray = list => {
3217 let initialElement = list
3318 const array = [ ]
3419
@@ -39,21 +24,16 @@ const listToArray = list => {
3924
4025 return array
4126}
42- console . log ( listToArray ( listToTransform ) ) // [1, 2, 3]
4327
44- // Part 2
45- const prepend = ( element , list ) => {
28+ export const prepend = ( element , list ) => {
4629 return {
4730 value : element ,
4831 rest : list ,
4932 }
5033}
51- console . log ( prepend ( 0 , listToTransform ) ) // => { value: 0, rest: { value: 1, rest: [Object] }}
5234
53- // Get an element from the list, recursively.
54- const nth = ( list , number ) => {
35+ export const nth = ( list , number ) => {
5536 if ( ! list ) return 'Element does not exist.'
5637
5738 return number - 1 === 0 && list !== null ? list : nth ( list . rest , number - 1 )
5839}
59- console . log ( nth ( listToTransform , 3 ) ) // => { value: 3, rest: null }
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