1- // Part 1
2- const range = ( start , end , step = 1 ) => {
1+ export const range = ( start , end , step ) => {
32 const numbers = [ ]
4- const interval = Math . abs ( step )
3+ const interval = Math . abs ( step ) || 1
54
6- if ( ! step ) return [ ]
5+ if ( start < end && step <= 0 ) return [ ]
6+ if ( start > end && step >= 0 ) return [ ]
77
8- if ( step > 0 ) {
9- if ( start < end ) {
10- for ( let i = start ; i <= end ; i += interval ) {
11- numbers . push ( i )
12- }
13- } else {
14- for ( let i = end ; i >= start ; i -= interval ) {
15- numbers . push ( i )
16- }
8+ if ( start < end ) {
9+ for ( let i = start ; i <= end ; i += interval ) {
10+ numbers . push ( i )
1711 }
1812 } else {
1913 for ( let i = start ; i >= end ; i -= interval ) {
@@ -24,7 +18,10 @@ const range = (start, end, step = 1) => {
2418 return numbers
2519}
2620
27- // Part 2
28- const sum = numbers => numbers . reduce ( ( accum , current ) => accum + current , 0 )
21+ export const sum = numbers => {
22+ if ( typeof numbers === 'number' ) return numbers
2923
30- console . log ( sum ( range ( 1 , 10 ) ) ) // => 55
24+ return Array . isArray ( numbers )
25+ ? numbers . reduce ( ( accum , current ) => accum + current , 0 )
26+ : null
27+ }
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