如何在多维数组中将字符串替换为整数 [英] How do I replace a string with integers in a multi-dimensional array

问题描述

所以我有一个对象数组:

So I have an array of objects :

var arr = [
    {name: 'John', cars: '2', railcard: 'yes', preferences: ['taxi', 'tram', 'walking']},
    {name: 'Mary', cars: '0', railcard: 'no', preferences: ['cyling', 'walking', 'taxi']},
    {name: 'Elon', cars: '100000', railcard: 'no', preferences: ['Falcon 9', 'self-driving', 'Hyper-loop']}
];

我正在尝试使用map，filter，reduce转换上述数组.即使可以轻松隔离特定的数据集，也无法更改原始数组.

I'm trying to transform the above array using map, filter, an reduce. I'm having trouble altering the original array even though I can easily isolate a specific data set.

例如:

我正在尝试将每个人拥有的汽车数量更改为数字而不是字符串，所以...

I'm trying to change the amount of cars owned by each person to be a number and not a string so...

var cars = arr.map(function(arr) {return arr.cars});
var carsToNumber = cars.map(function(x) {return parseInt(x)});

现在如何替换数组中的原始字符串值?

How do I now replace the original string values in the array?

预期结果:

var arr = [
    {name: 'John', cars: 2, railcard: 'yes', preferences: ['taxi', 'tram', 'walking']},
    {name: 'Mary', cars: 0, railcard: 'no', preferences: ['cyling', 'walking', 'taxi']},
    {name: 'Elon', cars: 100000, railcard: 'no', preferences: ['Falcon 9', 'self-driving', 'Hyper-loop']}
];

推荐答案

您可以只使用forEach循环并将字符串更改为数字. map()方法创建一个新数组.

You can just use forEach loop and change string to number. map() method creates a new array.

var arr = [
  {name: 'John', cars: '2', railcard: 'yes', preferences: ['taxi', 'tram', 'walking']},
  {name: 'Mary', cars: '0', railcard: 'no', preferences: ['cyling', 'walking', 'taxi']},
  {name: 'Elon', cars: '100000', railcard: 'no', preferences: ['Falcon 9', 'self-driving', 'Hyper-loop']}
];

arr.forEach(e => e.cars = +e.cars);
console.log(arr)

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