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April 19, 2016 17:41
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| let thing: ?string = ... // `thing` is a nullable string | |
| if (thing) { | |
| // Within this `if`, `thing` is of type `string`. No longer nullable. | |
| } | |
| // Outside the `if`, `thing` is still a nullable string. | |
| if (!thing) return | |
| // Since we returned if `thing` is null, `thing` is now of type `string`. |
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