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More Alex & Pancho pair programming
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// https://www.codewars.com/kata/5852d0d463adbd39670000a1/solutions/javascript | |
function goLeft(arr, n) { | |
let chunk = []; | |
if (n >= arr.length) { | |
return [arr]; | |
} | |
let endIndex = arr.length - 1; | |
for (let i = n - 1; i >= 0; i--) { | |
chunk.push(arr[endIndex - i]); | |
} | |
let remainder = arr.slice(0, -n); | |
return goLeft(remainder, n * 2).concat([chunk]); | |
} | |
function goRight(arr, n) { | |
let chunk = []; | |
if (n >= arr.length) { | |
return [arr]; | |
} | |
for (var i = 0; i < n; i++) { | |
chunk.push(arr[i]); | |
} | |
let remainder = arr.slice(i); | |
return [chunk].concat(goRight(remainder, n * 2)); | |
} | |
function mirroredExponentialChunks(arr){ | |
let chunked = []; | |
if (arr.length % 2 === 0) { | |
var n = 2; | |
var middle = arr.length / 2; | |
let before = []; | |
before.push(arr[middle-2]); | |
before.push(arr[middle-1]); | |
let after = []; | |
after.push(arr[middle]); | |
after.push(arr[middle+1]); | |
chunked.push(before, after); | |
var right = arr.slice(middle + 2); | |
var left = arr.slice(0, middle - 2); | |
} else { | |
var middle = Math.floor(arr.length / 2) | |
var n = 1; | |
chunked.push([arr[middle]]); | |
var right = arr.slice(middle + 1); | |
var left = arr.slice(0, middle); | |
} | |
chunked = goLeft(left, n * 2).concat(chunked).concat(goRight(right, n * 2)); | |
return chunked; | |
} | |
arr = [1,2,3,4,5,6,7,8,9,10, 11, 12, 13, 14, 15, 16, 17] | |
mirroredExponentialChunks(arr) |
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