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shellsort

v1.0.2

Published

Shell Sort

Downloads

4

Readme

NPM version Build Status Dependency Status

Shellsort

Shellsort implementation wth O(n^3/2) complexity based on JavaScript Algorithms.

Shellsort, also known as Shell sort or Shell's method, is an in-place comparison sort. It can be seen as either a generalization of sorting by exchange (bubble sort) or sorting by insertion (insertion sort).[1] The method starts by sorting pairs of elements far apart from each other, then progressively reducing the gap between elements to be compared.

Install

$ npm install --save shellsort

Usage

var shellsort = require('shellsort');

// Ascending order

shellsort([3,1,4,1,5,9,2,6,5,4]);
// => [1,1,2,3,4,4,5,5,6,9]

shellsort([9,2,8,6,1,3]);
// => [1,2,3,6,8,9]

shellsort([5,2,4,6,1,3]);
// => [1,2,3,4,5,6]

// Descending order

function comparator(a, b) { return b - a; }

shellsort([5,2,2,6,1,3], comparator);
// => [6,5,3,2,2,1]

shellsort([0,0,0,0,0,-1], comparator);
// => [0,0,0,0,0,-1]

// Ascending sort arrays of objects

var people = [
  {name: 'Sindre', age: 30, place: 2},
  {name: 'Passy', age: 25, place: 1},
  {name: 'Stephen', age: 40, place: 4},
  {name: 'Matt', age: 35, place: 3}
];

function comparePeople(a, b) { return a.age - b.age };

shellsort(people, comparePeople);
/*
=> [
  {"name": 'Passy', "age": 25, "place": 1},
  {"name": 'Sindre', "age": 30, "place": 2},
  {"name": 'Matt', "age": 35, "place": 3},
  {"name": 'Stephen', "age": 40, "place": 4}
]
*/

License

MIT © Tejas Manohar