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按属性对对象javascript数组排序

data-structures object sorting javascript

TSR · 技术社区 · 7 年前

我有一个未排序的对象数组,它有两个相关属性: type 和 date . 我需要对这个数组进行排序:

按日期和
按类型(每年, deposit 应该先走 withdrawal )

以下是输入示例:

let i = [
    {
        date:'2017',
        type:'withdrawal',
        amount:-5
    },
    {
        date:'2016',
        type:'deposit',
        amount:12
    },
    {
        date:'2018',
        type:'deposit',
        amount:54
    },
    {
        date:'2017',
        type:'deposit',
        amount:20
    },
    {
        date:'2016',
        type:'withdrawal',
        amount:55
    },
    {
        date:'2018',
        type:'withdrawal',
        amount:54
    }
]

目标是输出如下内容:

let o = [
    {
        date:'2016',
        type:'deposit',
        amount:12
    },
    {
        date:'2016',
        type:'withdrawal',
        amount:55
    },
    {
        date:'2017',
        type:'deposit',
        amount:20
    },
    {
        date:'2017',
        type:'withdrawal',
        amount:-5
    },
    {
        date:'2018',
        type:'deposit',
        amount:54
    },
    {
        date:'2018',
        type:'withdrawal',
        amount:54
    }
]

到目前为止,我设法使用以下方法按日期对数组进行排序:

o = i.sort((a,b)=>(a.date - b.date))

但我找不到按类型分类的方法

3 回复 | 直到 7 年前

Nitish Narang 7 年前

i.sort((a,b) => ((+a.date) - (+b.date) || (a.type.localeCompare(b.type))))

let i = [
    {
        date:'2017',
        type:'withdrawal',
        amount:-5
    },
    {
        date:'2016',
        type:'deposit',
        amount:12
    },
    {
        date:'2018',
        type:'deposit',
        amount:54
    },
    {
        date:'2017',
        type:'deposit',
        amount:20
    },
    {
        date:'2016',
        type:'withdrawal',
        amount:55
    },
    {
        date:'2018',
        type:'withdrawal',
        amount:54
    }
]  

i.sort((a,b) => ((+a.date) - (+b.date) || (a.type.localeCompare(b.type))))

console.log(i)

Hassan Imam Ravi kant 7 年前

string#localCompare date type

let arr = [ { date:'2017', type:'withdrawal', amount:-5 }, { date:'2016', type:'deposit', amount:12 }, { date:'2018', type:'deposit', amount:54 }, { date:'2017', type:'deposit', amount:20 }, { date:'2016', type:'withdrawal', amount:55 }, { date:'2018',type:'withdrawal', amount:54 } ];
arr.sort((a,b) => a.date.localeCompare(b.date) || a.type.localeCompare(b.type));
console.log(arr);

Gabor Szekely 7 年前

i.sort((a,b) => {
  let aStr = `${a.date}${a.type}`;
  let bStr = `${b.date}${b.type}`;
  if(aStr > bStr) {
    return 1;
  } else if(aStr === bStr) {
    return 0;
  } else {
    return -1;
  }
});