如何根据键值更新javascript数组中的行？ [英] How can I update a row in a javascript array based on a key value?

问题描述

我有这样的数据数组：

var nameInfo  = [{name: "Moroni", age: 50},
                 {name: "Tiancum", age: 43},
                 {name: "Jacob", age: 27},
                 {name: "Nephi", age: 29},
                 {name: "Enos", age: 34}];

如果我有这样的对象：

var nameInfo  = {name: "Moroni", age: 51};

有没有一种简单的方法可以更新变量nameInfo。这些之间的关键
是名称列。我知道有一种方法，我可以通过搜索行，删除和添加
来做到这一点，但我希望
有办法在我更新行的地方做到这一点。请注意，如果它有帮助我确实加载了underscore.js.

Is there a simple way that I can update the variable nameInfo. The key between these is the name column. I know there is a way that I could do this by searching for the row, removing and adding but I would like to have a way to do this where I updated the row. Note that if it helps I do have underscore.js loaded.

推荐答案

最简单的方法就是循环找到一个匹配的名称然后更新年龄：

Easiest way is to just loop over and find the one with a matching name then update the age:

var newNameInfo  = {name: "Moroni", age: 51};
var name = newNameInfo.name;

for (var i = 0, l = nameInfo.length; i < l; i++) {
    if (nameInfo[i].name === name) {
        nameInfo[i].age = newNameInfo.age;
        break;
    }
}

JSFiddle示例

使用下划线可以使用 _。找到方法来执行以下操作而不是for循环：

Using underscore you can use the _.find method to do the following instead of the for loop:

var match = _.find(nameInfo, function(item) { return item.name === name })
if (match) {
    match.age = newNameInfo.age;
}

JSFiddle示例

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