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const sum = (numbers = []) => { | |
if (numbers.length === 0) { | |
return 0 | |
} | |
return numbers[0] + sum(numbers.slice(1)) | |
} | |
const max = (numbers = []) => { | |
if (numbers.length === 0) { | |
return 0 | |
} | |
if (numbers.length === 2) { | |
return numbers[0] > numbers[1] | |
? numbers[0] | |
: numbers[1] | |
} | |
const subMax = max(numbers.slice(1)) | |
return numbers[0] > subMax | |
? numbers[0] | |
: subMax | |
} | |
const quickSort = (numbers = []) => { | |
if (numbers.length < 2) { | |
return numbers | |
} | |
const pivot = numbers[0] | |
const rest = numbers.slice(1) | |
const left = rest.filter((value) => value <= pivot) | |
const right = rest.filter((value) => value > pivot) | |
return [ ...quickSort(left), pivot, ...quickSort(right) ] | |
} |
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