Joining property values of objects in an array

Question

I have an array of objects. The objects have a property called userName. Is there a way to concatenate the userName values into a comma delimited string? I assume I can use the join function but the only way I can think of takes two steps.

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?

Nikola Dimitroff · Accepted Answer · 2017-06-10 12:28:29Z

53

Use map instead of forEach and drop the parenthesis and the curly braces in the lambda:

var userNames = objectArr.map(o => o.userName).join(', ');

edited Jun 10, 2017 at 12:28

answered Jul 25, 2014 at 0:23

Nikola Dimitroff

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3 Comments

Zulqarnain Jalil Over a year ago

what shoud we do if we don't want to join the empty usernames ?

Nikola Dimitroff Over a year ago

@ZulqarnainJalil just filter the items before joining: objectArr.map(o => o.userName).filter(name => name).join(', ');

Fes Nguyen Over a year ago

Can we collect more than 1 properties? Like fullName?

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