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PATH: usr / local / lib / node_modules / ghost-cli / node_modules / rxjs / src / internal / operators

import { Operator } from '../Operator';
import { Subscriber } from '../Subscriber';
import { Observable } from '../Observable';
import { OperatorFunction } from '../types';

/**
 * Applies a given `project` function to each value emitted by the source
 * Observable, and emits the resulting values as an Observable.
 *
 * <span class="informal">Like [Array.prototype.map()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map),
 * it passes each source value through a transformation function to get
 * corresponding output values.</span>
 *
 * ![](map.png)
 *
 * Similar to the well known `Array.prototype.map` function, this operator
 * applies a projection to each value and emits that projection in the output
 * Observable.
 *
 * ## Example
 * Map every click to the clientX position of that click
 * ```ts
 * import { fromEvent } from 'rxjs';
 * import { map } from 'rxjs/operators';
 *
 * const clicks = fromEvent(document, 'click');
 * const positions = clicks.pipe(map(ev => ev.clientX));
 * positions.subscribe(x => console.log(x));
 * ```
 *
 * @see {@link mapTo}
 * @see {@link pluck}
 *
 * @param {function(value: T, index: number): R} project The function to apply
 * to each `value` emitted by the source Observable. The `index` parameter is
 * the number `i` for the i-th emission that has happened since the
 * subscription, starting from the number `0`.
 * @param {any} [thisArg] An optional argument to define what `this` is in the
 * `project` function.
 * @return {Observable<R>} An Observable that emits the values from the source
 * Observable transformed by the given `project` function.
 * @method map
 * @owner Observable
 */
export function map<T, R>(project: (value: T, index: number) => R, thisArg?: any): OperatorFunction<T, R> {
  return function mapOperation(source: Observable<T>): Observable<R> {
    if (typeof project !== 'function') {
      throw new TypeError('argument is not a function. Are you looking for `mapTo()`?');
    }
    return source.lift(new MapOperator(project, thisArg));
  };
}

export class MapOperator<T, R> implements Operator<T, R> {
  constructor(private project: (value: T, index: number) => R, private thisArg: any) {
  }

call(subscriber: Subscriber<R>, source: any): any {
    return source.subscribe(new MapSubscriber(subscriber, this.project, this.thisArg));
  }
}

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
class MapSubscriber<T, R> extends Subscriber<T> {
  count: number = 0;
  private thisArg: any;

constructor(destination: Subscriber<R>,
              private project: (value: T, index: number) => R,
              thisArg: any) {
    super(destination);
    this.thisArg = thisArg || this;
  }

// NOTE: This looks unoptimized, but it's actually purposefully NOT
  // using try/catch optimizations.
  protected _next(value: T) {
    let result: any;
    try {
      result = this.project.call(this.thisArg, value, this.count++);
    } catch (err) {
      this.destination.error(err);
      return;
    }
    this.destination.next(result);
  }
}

[-] toArray.ts [edit]
[-] window.ts [edit]
[-] retry.ts [edit]
[-] mergeAll.ts [edit]
[-] windowWhen.ts [edit]
[-] every.ts [edit]
[-] timeout.ts [edit]
[-] debounceTime.ts [edit]
[-] index.ts [edit]
[-] takeWhile.ts [edit]
[-] audit.ts [edit]
[-] reduce.ts [edit]
[-] mapTo.ts [edit]
[-] count.ts [edit]
[-] debounce.ts [edit]
[-] throwIfEmpty.ts [edit]
[-] auditTime.ts [edit]
[-] scan.ts [edit]
[-] switchAll.ts [edit]
[-] map.ts [edit]
[-] bufferCount.ts [edit]
[-] mergeScan.ts [edit]
[-] publish.ts [edit]
[-] min.ts [edit]
[+] ..
[-] publishReplay.ts [edit]
[-] bufferTime.ts [edit]
[-] share.ts [edit]
[-] repeat.ts [edit]
[-] distinct.ts [edit]
[-] concatMapTo.ts [edit]
[-] buffer.ts [edit]
[-] concatMap.ts [edit]
[-] max.ts [edit]
[-] partition.ts [edit]
[-] observeOn.ts [edit]
[-] bufferWhen.ts [edit]
[-] dematerialize.ts [edit]
[-] throttle.ts [edit]
[-] groupBy.ts [edit]
[-] withLatestFrom.ts [edit]
[-] exhaust.ts [edit]
[-] exhaustMap.ts [edit]
[-] retryWhen.ts [edit]
[-] zipAll.ts [edit]
[-] find.ts [edit]
[-] mergeMap.ts [edit]
[-] single.ts [edit]
[-] last.ts [edit]
[-] combineLatest.ts [edit]
[-] publishLast.ts [edit]
[-] pluck.ts [edit]
[-] pairwise.ts [edit]
[-] distinctUntilChanged.ts [edit]
[-] timeInterval.ts [edit]
[-] shareReplay.ts [edit]
[-] skipUntil.ts [edit]
[-] findIndex.ts [edit]
[-] windowToggle.ts [edit]
[-] startWith.ts [edit]
[-] timeoutWith.ts [edit]
[-] concat.ts [edit]
[-] materialize.ts [edit]
[-] timestamp.ts [edit]
[-] onErrorResumeNext.ts [edit]
[-] subscribeOn.ts [edit]
[-] takeUntil.ts [edit]
[-] skipLast.ts [edit]
[-] throttleTime.ts [edit]
[-] mergeMapTo.ts [edit]
[-] multicast.ts [edit]
[-] merge.ts [edit]
[-] takeLast.ts [edit]
[-] delayWhen.ts [edit]
[-] sampleTime.ts [edit]
[-] tap.ts [edit]
[-] take.ts [edit]
[-] sample.ts [edit]
[-] filter.ts [edit]
[-] skip.ts [edit]
[-] expand.ts [edit]
[-] publishBehavior.ts [edit]
[-] sequenceEqual.ts [edit]
[-] ignoreElements.ts [edit]
[-] catchError.ts [edit]
[-] endWith.ts [edit]
[-] refCount.ts [edit]
[-] windowCount.ts [edit]
[-] defaultIfEmpty.ts [edit]
[-] windowTime.ts [edit]
[-] switchMapTo.ts [edit]
[-] switchMap.ts [edit]
[-] delay.ts [edit]
[-] bufferToggle.ts [edit]
[-] repeatWhen.ts [edit]
[-] concatAll.ts [edit]
[-] first.ts [edit]
[-] zip.ts [edit]
[-] elementAt.ts [edit]
[-] skipWhile.ts [edit]
[-] race.ts [edit]
[-] finalize.ts [edit]
[-] combineAll.ts [edit]
[-] distinctUntilKeyChanged.ts [edit]
[-] isEmpty.ts [edit]