`members.putIfAbsent(key, value)`

# announcements

[Shawn]

members.putIfAbsent(key, value)

[brabo-hi]

i need to only check if the key doesn't exist, the value can be deferent

[Shawn]

it takes the value so it can set it if the key doesn’t exist

[Shawn]

https://docs.oracle.com/javase/8/docs/api/java/util/Map.html#putIfAbsent-K-V-