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signature: single(a: Function): Observable
single(a: Function): ObservableEmit single item that passes expression.
Examples
Example 1: Emit first number passing predicate
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// RxJS v6+
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import { from } from 'rxjs';
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import { single } from 'rxjs/operators';
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//emit (1,2,3,4,5)
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const source = from([1, 2, 3, 4, 5]);
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//emit one item that matches predicate
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const example = source.pipe(single(val => val === 4));
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//output: 4
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const subscribe = example.subscribe(val => console.log(val));
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