在javascript中按子数组属性值对对象数组进行排序

Question

I have an array of JavaScript objects:

var people = [
{
    "name": "Edward",
    "age": 100,
    "wallet": {
        "location": "home",
        "cash": 500
    },
    "bank": {
        "location": "bank street",
        "cash": 22100
    }
},
{
    "name": "Lisa",
    "age": 30,
    "wallet": {
        "location": "home",
        "cash": 20
    },
    "bank": {
        "location": "bank street",
        "cash": 12340
    }
},
{
    "name": "Elisabeth",
    "age": 50,
    "wallet": {
        "location": "home",
        "cash": 200
    },
    "bank": {
        "location": "bank street",
        "cash": 5000
    }
}
];

How can I sort them by wallet.cash ?

This following example (by Ege Özcan) works if I wanted to sort these objects by name, or age, but I have hard time modifying it to work with multidimensional key.

function dynamicSort(property) {
var sortOrder = 1;
if(property[0] === "-") {
    sortOrder = -1;
    property = property.substr(1);
}
return function (a,b) {
    var result = (a[property] < b[property]) ? -1 : (a[property] > b[property]) ? 1 : 0;
    return result * sortOrder;
}
}

This works:

people.sort(dynamicSort("name"));

This doesn't:

people.sort(dynamicSort("wallet.cash"));

Thank you in advance!

Answer 1

Lifting this comparison function from here , you can do:

function compare(a,b) {
  if (a.wallet.cash < b.wallet.cash)
    return -1;
  if (a.wallet.cash > b.wallet.cash)
    return 1;
  return 0;
}

var people = [...];
console.log(people.sort(compare));

Answer 2

You can pass two different arguments to dynamicSort function

function dynamicSort(property1,property2) {
var sortOrder = 1;
if(property1[0] === "-") {
    sortOrder = -1;
    property1 = property1.substr(1);
}
return function (a,b) {
    var result = (a[property1][property2] < b[property1][property2]) ? -1 : (a[property1][property2] > b[property1][property2]) ? 1 : 0;
    return result * sortOrder;
}
}

And then call

dynamicSort("wallet","cash");

DEMO

 var people = [ { "name": "Edward", "age": 100, "wallet": { "location": "home", "cash": 500 }, "bank": { "location": "bank street", "cash": 22100 } }, { "name": "Lisa", "age": 30, "wallet": { "location": "home", "cash": 20 }, "bank": { "location": "bank street", "cash": 12340 } }, { "name": "Elisabeth", "age": 50, "wallet": { "location": "home", "cash": 200 }, "bank": { "location": "bank street", "cash": 5000 } } ]; function dynamicSort(property1,property2) { var sortOrder = 1; if(property1[0] === "-") { sortOrder = -1; property1 = property1.substr(1); } return function (a,b) { var result = (a[property1][property2] < b[property1][property2]) ? -1 : (a[property1][property2] > b[property1][property2]) ? 1 : 0; return result * sortOrder; } } alert(JSON.stringify(people.sort(dynamicSort("wallet","cash")))) 

Answer 3

You can use Object.byString method from this stackoverflow answer and modify your code like this:

function dynamicSort(property) {
    var sortOrder = 1;
    if(property[0] === "-") {
        sortOrder = -1;
        property = property.substr(1);
    }
    return function (a,b) {
        var avalue = Object.byString(a, property);
        var bvalue = Object.byString(b, property);
        var result = (avalue < bvalue) ? -1 : (avalue > bvalue) ? 1 : 0;
        return result * sortOrder;
    }
}