[英]Does JavaScript have a similar capability as LINQ's Select statement?
Say I have an array of window objects and each has an ID property and I need to get an array of those IDs. 假设我有一个窗口对象数组,每个对象都有一个ID属性,我需要获取这些ID的数组。
In LINQ, I would just do this... 在LINQ中,我只会这样做...
var ids = windows.Select(window => window.id).ToArray();
Nice and simple. 漂亮又简单。 But in Javascript, I've been doing this...
但是在Javascript中,我一直在做...
var ids = [];
for(i = 0; i < windows.length; i++)
{
var window = windows[i];
ids.push(window.id);
}
I'm just wondering if there's a simpler/easier way in Javascript, similar to LINQ's elegant solution. 我只是想知道Java语言中是否有更简单/更简便的方法,类似于LINQ的优雅解决方案。
If you are happy with IE8 and above support, array.map() is a comparable option: 如果您对IE8及以上版本的支持感到满意,可以使用array.map()作为可比较的选择:
var ids = windows.map(function(val) {
return val.id;
});
This of course becomes even more succinct (and similar to LINQ) if using ES6 fat arrow functions, although this will require a transpiler if supporting non-cutting edge browsers: 如果使用ES6粗箭头功能,这当然会变得更加简洁(与LINQ相似),但是如果支持非尖端浏览器,则需要编译器:
var ids = windows.map(x => x.id);
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