Question

我有一个非常简单的对象，如下所示。我正在尝试使用var myArray = ["Monday", "Tuesday", "Wednesday"]; // forEach is built to only iterate the indexes of an array // but allows us to do it without having to set up or maintain // any counters. myArray.forEach(function(value){ console.log(value); });，因为我在我的应用程序的其他部分使用它。我试图找到一种方法将特定键的值转换为数字。

在下面的示例中，类似于：

lodash

对象

_.mapValues(obj.RuleDetailID, _.method('parseInt'))

预期输出：

var obj = [{
  "RuleDetailID": "11624",
  "AttributeValue": "172",
  "Value": "Account Manager",
  "IsValueRetired": "0"
}, {
  "RuleDetailID": "11626",
  "AttributeValue": "686",
  "Value": "Agent",
  "IsValueRetired": "0"
}, {
  "RuleDetailID": "11625",
  "AttributeValue": "180",
  "Value": "Analyst",
  "IsValueRetired": "0"
}, {
  "RuleDetailID": "11629",
  "AttributeValue": "807",
  "Value": "Individual Contributor",
  "IsValueRetired": "0"
}, {
  "RuleDetailID": "11627",
  "AttributeValue": "690",
  "Value": "Senior Agent",
  "IsValueRetired": "0"
}];

我是否可以与var obj = [{ "RuleDetailID": 11624, "AttributeValue": "172", "Value": "Account Manager", "IsValueRetired": "0" }, { "RuleDetailID": 11626, "AttributeValue": "686", "Value": "Agent", "IsValueRetired": "0" }, { "RuleDetailID": 11625, "AttributeValue": "180", "Value": "Analyst", "IsValueRetired": "0" }, { "RuleDetailID": 11629, "AttributeValue": "807", "Value": "Individual Contributor", "IsValueRetired": "0" }, { "RuleDetailID": 11627, "AttributeValue": "690", "Value": "Senior Agent", "IsValueRetired": "0" }];一起制作一系列方法来实现这一目标？

Answer 1

如果您想 mutate 原始数组，请使用lodash#each：

_.each(obj, item => item.RuleDetailID = parseInt(item.RuleDetailID, 10));

如果您想创建一个新数组（不要改变原始数组），请将lodash#map与lodash#clone一起使用：

let newArr = _.map(obj, item => {
  let newItem = _.clone(item);
  newItem.RuleDetailID = parseInt(newItem.RuleDetailID, 10);
  return newItem;
});

Answer 2

为使数组中对象的单个属性发生变异，我建议以下内容：

each：https://lodash.com/docs/#forEach
- 遍历每个对象
update：https://lodash.com/docs/#update
- 更新值
parseInt：https://lodash.com/docs/#parseInt
- 根据您的情况，将RuleDetailID属性更新为数字而不是字符串。

repl.it上的示例：https://repl.it/repls/AdvancedOilyParentheses#index.js

示例：

_.each(arr, obj => _.update(obj, 'RuleDetailID', _.parseInt));

您使用了数据：（供参考：我将obj重命名为arr，因为它不是对象。）

var arr = [{
  "RuleDetailID": "11624",
  "AttributeValue": "172",
  "Value": "Account Manager",
  "IsValueRetired": "0"
}, {
  "RuleDetailID": "11626",
  "AttributeValue": "686",
  "Value": "Agent",
  "IsValueRetired": "0"
}, {
  "RuleDetailID": "11625",
  "AttributeValue": "180",
  "Value": "Analyst",
  "IsValueRetired": "0"
}, {
  "RuleDetailID": "11629",
  "AttributeValue": "807",
  "Value": "Individual Contributor",
  "IsValueRetired": "0"
}, {
  "RuleDetailID": "11627",
  "AttributeValue": "690",
  "Value": "Senior Agent",
  "IsValueRetired": "0"
}];

lodash将对象值（字符串）转换为数字

2 个答案: