I know this is a very basic question but I could not find a source to explain this code snippet. What is this code mean?
hasChanged = hasChanged || nextStateForKey !== previousStateForKey
I know the meaning of !== but
How does !== work here?
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`!==` works the same way - it returns a boolean. It will be `true` if `nextStateForKey` is not equal to `previousStateForKey` and `false` otherwise – VLAZ Apr 21 '20 at 07:35
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It assigns the value of `hasChanged` *or* `nextStateForKey !== previousStateForKey` to `hasChanged`, depending on which is falsey. – deceze Apr 21 '20 at 07:35
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[What does the construct x = x || y mean?](https://stackoverflow.com/q/2802055) + [Javascript operator !==](https://stackoverflow.com/q/1889260) – VLAZ Apr 21 '20 at 07:40