用javascript中其中之一的值对2数组进行排序 [英] sort 2 array with the values of one of them in javascript

问题描述

我有两个数组，可以说 priceArray = [1,5,3,7]

i have two array, lets say priceArray= [1,5,3,7]

userIdArray = [11，52，41，5]

userIdArray=[11, 52, 41, 5]

我需要对priceArray进行排序，以便对userIdArray也进行排序. 例如，输出应为:

i need to sort the priceArray, so that the userIdArray will be also sorted. for example the output should be:

priceArray = [1,3,5,7] userIdArray = [11，41，52，5]

priceArray= [1,3,5,7] userIdArray=[11, 41, 52, 5]

有什么想法怎么做?

我正在用NodeJS编写服务器

i am writing my server in NodeJS

推荐答案

来自

Taken from Sorting with map and adapted for the userIdArray:

// the array to be sorted
var priceArray = [1, 5, 3, 7],
    userIdArray = [11, 52, 41, 5];

// temporary array holds objects with position and sort-value
var mapped = priceArray.map(function (el, i) {
    return { index: i, value: el };
});

// sorting the mapped array containing the reduced values
mapped.sort(function (a, b) {
    return a.value - b.value;
});

// container for the resulting order
var resultPrice = mapped.map(function (el) {
    return priceArray[el.index];
});
var resultUser = mapped.map(function (el) {
    return userIdArray[el.index];
});

document.write('<pre>' + JSON.stringify(resultPrice, 0, 4) + '</pre>');
document.write('<pre>' + JSON.stringify(resultUser, 0, 4) + '</pre>');

具有适当的数据结构，如 rrowland 建议的那样，您可以使用以下方法:

With proper data structure, as rrowland suggest, you might use this:

var data = [{
        userId: 11, price: 1
    }, {
        userId: 52, price: 15
    }, {
        userId: 41, price: 13
    }, {
        userId: 5, price: 17
    }];

data.sort(function (a, b) {
    return a.price - b.price;
});

document.write('<pre>' + JSON.stringify(data, 0, 4) + '</pre>');

使用ES6时要短一些

var priceArray = [1, 5, 3, 7],
    userIdArray = [11, 52, 41, 5],
    temp = Array.from(priceArray.keys()).sort((a, b) => priceArray[a] - priceArray[b]);

priceArray = temp.map(i => priceArray[i]);
userIdArray = temp.map(i => userIdArray[i]);

console.log(priceArray);
console.log(userIdArray);

.as-console-wrapper { max-height: 100% !important; top: 0; }

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