[CHALLENGE] Remap elements array elements to a new start element

Question

Consider the array:
[a, b, c, d, e]

The user will choose a new index to array begins, like 3, and needs receive the result:
[d, e, a, b, c]
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Another example:

Array: ["python", "java", "ruby", "swift"]
Remapped to index 1: ["java", "ruby", "swift", "python"]

>#GIVE PREFERENCE TO JAVASCRIPT#<

Answer 1

that is called circular shifting

edit:
upon reading the challenge again, it's not quite circular shifting (reversed circular shifting with an index limitation, but that does not roll well on the tongue 😅)

updated code as well ;)

Answer 2

https://code.sololearn.com/WQo2xaKTb91u/?ref=app

Answer 3

Here I post my Python code with 3 ways of doing It, they are quite easy to understand and to do thanks to Python language, but Im sure you can translate that into java script.
https://code.sololearn.com/c1U8n7ojEnnY/?ref=app

Answer 4

My approach:

We have to take our sequence, keeping the original order, starting in another index. When we start in another index we can look that we got a "sub-sequence" from new index to last index. Taking question example you can look:

s = [a, b, c, d, e] / targetIndex = 2
if we want to start this sequence in index 2, we will got a new sub-sequence from 2 to s.length: [c, d, e].

Once we "sliced" our main sequence, we just need append the firsts elements to end of our first sliced sequence (elements from 0 to targetIndex): [a, b]

Once we have to sub-sequences from main, we just need concat second in the first, then we got the remapped array:

first: [c, d, e]
second: [a, b]
result: [c, d, e, a, b]

Then this solves the challenge!
Code: https://code.sololearn.com/WC06dtjgKN7q/#js

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Do you have a another cool approach? :)

Answer 5

Cool! I love Python as well. Thanks for coding!