javascript 将对象的属性值连接到数组中
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Joining property values of objects in an array
提问by nthpixel
I have an array of objects. The objects have a property called userName. Is there a way to concatenate the userNamevalues into a comma delimited string? I assume I can use the joinfunction but the only way I can think of takes two steps.
我有一个对象数组。这些对象有一个名为 的属性userName。有没有办法将userName值连接成逗号分隔的字符串？我假设我可以使用该join功能，但我能想到的唯一方法需要两个步骤。
var userNames: string[];
objectArr.forEach((o) => { userNames.push(o.userName); });
var userNamesJoined = userNames.join(",");
Is there a way to do it in one line of code?
有没有办法在一行代码中做到这一点？
回答by Nikola Dimitroff
Use mapinstead of forEachand drop the parenthesis and the curly braces in the lambda:
使用map代替forEach并删除 lambda 中的括号和花括号：
var userNames = objectArr.map(o => o.userName).join(', ');
var userNames = objectArr.map(o => o.userName).join(', ');
