How to access object element key from a variable?

Good day,

There is an object with the same keys but with different suffixes:

var ob = {
 name_1 : "www", name_2:"yyy", name_3:"zzz"
var str = 'name_' + getSuff();
var res = ob.str;

The last line throws an error on non-existent element. Tell me - how this point can be implemented correctly?
July 2nd 19 at 17:47
1 answer
July 2nd 19 at 17:49
And thank you! - dudley_Ri commented on July 2nd 19 at 17:52

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