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Update concat.md #315

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4 changes: 2 additions & 2 deletions operators/combination/concat.md
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Original file line number Diff line number Diff line change
Expand Up @@ -54,14 +54,14 @@ concat(

```js
// RxJS v6+
import { concat, empty } from 'rxjs';
import { concat, EMPTY } from 'rxjs';
import { delay, startWith } from 'rxjs/operators';

// elems
const userMessage = document.getElementById('message');
// helper
const delayedMessage = (message, delayedTime = 1000) => {
return empty().pipe(startWith(message), delay(delayedTime));
return EMPTY.pipe(startWith(message), delay(delayedTime));
};

concat(
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