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arr-sort

v1.2.5

Published

Sort an object array by one or more properties even nested properties. Besides, you can determine the direction even supply a comparison function in each property sorting.

Downloads

171

Readme

arr-sort GitHub license NPM version NPM monthly downloads NPM total downloads Windows Build Status

English

根据一个或者多个属性对数组进行排序,支持嵌套的属性。而且可以在每个条件中指定排序的方向,并支持传入比较函数。

更新

1.2.5 版本提升了数组的排序性能接近 2 倍

1.2.0 版本极大的提升了数组的排序性能,提升将近 100 倍!主要是优化了代码和算法逻辑。比如,当输入的数组长度为 2000 时,排序时间:1.1.0 版本大概需要 10s;1.2.0 版本大概在 100ms 以内。

安装

采用 npm 安装:

$ npm install --save arr-sort

采用 yarn 安装:

$ yarn add arr-sort

用法

通过给定的对象属性进行排序:

var arrSort = require('arr-sort');

arrSort([{foo: 'y'}, {foo: 'z'}, {foo: 'x'}],[{attr:'foo'}]);
//=> [{foo: 'x'}, {foo: 'y'}, {foo: 'z'}]

逆向排序

arrSort([{foo: 'y'}, {foo: 'z'}, {foo: 'x'}],[{attr:'foo', asc: false}]);
//=> [{foo: 'z'}, {foo: 'y'}, {foo: 'x'}]

参数

arrSort(array, comparisonArgs);
  • array: { Object Array } 待排序的数组
  • comparisonArgs: { Object Array } 一个或者多个对象组成的数组。 结构如下:{ 'attr': attr, 'asc': asc }
    • attr: { String } 对象属性
    • asc: { Boolean | Function } 指定排序的方向
      • true: 升序(默认值)
      • false: 降序
      • function: 传入的比较函数

注意

  • 如何没有提供 attr 属性, 则这次的排序会自动跳过
  • attr 属性值类型可以是 string 或者 number
    • 如果是 string, 我们采用 localeCompare 去比较排序
    • 如果是 number, 我们直接比较值的大小
  • 比较函数一定要遵循sort函数规范,如果是相等,一定要返回0,否则后续的排序不会参与!如果提供的比较函数没有返回值,则这次的排序会自动跳过

例子

1. 多重条件排序

var arrSort = require('arr-sort');

var array = [
  { foo: 'bbb', num: 4,  flag: 2 },
  { foo: 'aaa', num: 3,  flag: 1 },
  { foo: 'ccc', num: -6, flag: 2 },
  { foo: 'ccc', num: 8,  flag: 2 },
  { foo: 'bbb', num: 2,  flag: 4 },
  { foo: 'aaa', num: -3, flag: 4 }
];

// sort by `flag`, then `foo`, then `num`
var result = arrSort(array,
    [{
        attr: 'flag',
        asc: true
    },
    {
        attr: 'foo',
        asc: false
    },
    {
        attr: 'num',
        asc: true
    }]
);

console.log(result);
// [ { foo: 'aaa', num: 3,  flag: 1},
//   { foo: 'ccc', num: -6, flag: 2},
//   { foo: 'ccc', num: 8,  flag: 2},
//   { foo: 'bbb', num: 4,  flag: 2},
//   { foo: 'bbb', num: 2,  flag: 4},
//   { foo: 'aaa', num: -3, flag: 4} ]

2. 嵌套的属性排序

var arrSort = require('arr-sort');

var array = [
  { locals: { foo: 'bbb', num: 4 },  flag: 2},
  { locals: { foo: 'aaa', num: 3 },  flag: 1},
  { locals: { foo: 'ccc', num: -6 }, flag: 2},
  { locals: { foo: 'ccc', num: 8 },  flag: 2},
  { locals: { foo: 'bbb', num: 2 },  flag: 4},
  { locals: { foo: 'aaa', num: -3 }, flag: 4},
];

// sort by `flag`, then `locals.foo`, then `locals.num`
var result = arrSort(array,
    [{
        attr: 'flag',
        asc: true
    },
    {
        attr: 'locals.foo',
        asc: false
    },
    {
        attr: 'locals.num',
        asc: true
    }]
);

console.log(result);
// [ { locals: { foo: 'aaa', num: 3 },  flag: 1},
//   { locals: { foo: 'ccc', num: -6 }, flag: 2},
//   { locals: { foo: 'ccc', num: 8 },  flag: 2},
//   { locals: { foo: 'bbb', num: 4 },  flag: 2},
//   { locals: { foo: 'bbb', num: 2 },  flag: 4},
//   { locals: { foo: 'aaa', num: -3 }, flag: 4} ]

3. 传入比较函数排序

如果提供了比较函数,数组会根据其返回值排序。参考:sort函数规范

var arrSort = require('arr-sort');

var array = [
  { locals: { foo: 'bbb', num: 4 },  flag: -2},
  { locals: { foo: 'aaa', num: 3 },  flag: 1},
  { locals: { foo: 'ccc', num: -6 }, flag: 2},
  { locals: { foo: 'ccc', num: 8 },  flag: 2},
  { locals: { foo: 'bbb', num: 2 },  flag: 4},
  { locals: { foo: 'aaa', num: -3 }, flag: 4},
];

// sort by `flag`, then `locals.foo`, then `locals.num`
var result = arrSort(array,
    [{
        attr: 'flag',
        asc: function(a,b){return (Math.abs(a) - Math.abs(b))}
    },
    {
        attr: 'locals.foo',
        asc: false
    },
    {
        attr: 'locals.num',
        asc: true
    }]
);

console.log(result);
// [ { locals: { foo: 'aaa', num: 3 },  flag: 1},
//   { locals: { foo: 'ccc', num: -6 }, flag: 2},
//   { locals: { foo: 'ccc', num: 8 },  flag: 2},
//   { locals: { foo: 'bbb', num: 4 },  flag: -2},
//   { locals: { foo: 'bbb', num: 2 },  flag: 4},
//   { locals: { foo: 'aaa', num: -3 }, flag: 4} ]

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作者

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许可证

Copyright © 2018, tywei90. Released under the MIT License.