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Learn RxJS
pluck
signature: pluck(properties: ...args): Observable
pluck(properties: ...args): ObservableSelect property to emit.
New to transformation operators? Check out the article Get started transforming streams with map, pluck, and mapTo!
Examples
Example 1: Pluck object property
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// RxJS v6+
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import { from } from 'rxjs';
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import { pluck } from 'rxjs/operators';
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const source = from([
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{ name: 'Joe', age: 30 },
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{ name: 'Sarah', age: 35 }
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]);
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//grab names
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const example = source.pipe(pluck('name'));
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//output: "Joe", "Sarah"
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const subscribe = example.subscribe(val => console.log(val));
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Example 2: Pluck nested properties
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// RxJS v6+
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import { from } from 'rxjs';
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import { pluck } from 'rxjs/operators';
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const source = from([
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{ name: 'Joe', age: 30, job: { title: 'Developer', language: 'JavaScript' } },
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//will return undefined when no job is found
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{ name: 'Sarah', age: 35 }
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]);
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//grab title property under job
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const example = source.pipe(pluck('job', 'title'));
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//output: "Developer" , undefined
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const subscribe = example.subscribe(val => console.log(val));
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