Code coverage report for src/operator/map.ts

Statements: 100% (25 / 25)      Branches: 100% (2 / 2)      Functions: 100% (7 / 7)      Lines: 100% (23 / 23)      Ignored: none     

All files » src/operator/ » map.ts
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import {Operator} from '../Operator';
import {Subscriber} from '../Subscriber';
import {Observable} from '../Observable';
import {tryCatch} from '../util/tryCatch';
import {errorObject} from '../util/errorObject';
import {bindCallback} from '../util/bindCallback';
 
/**
 * Similar to the well known `Array.prototype.map` function, this operator
 * applies a projection to each value and emits that projection in the returned observable
 *
 * @param {Function} project the function to create projection
 * @param {any} [thisArg] an optional argument to define what `this` is in the project function
 * @returns {Observable} a observable of projected values
 */
export function map<T, R>(project: (x: T, ix?: number) => R, thisArg?: any): Observable<R> {
  return this.lift(new MapOperator(project, thisArg));
}
 
class MapOperator<T, R> implements Operator<T, R> {
 
  project: (x: T, ix?: number) => R;
 
  constructor(project: (x: T, ix?: number) => R, thisArg?: any) {
    this.project = <(x: T, ix?: number) => R>bindCallback(project, thisArg, 2);
  }
  call(subscriber: Subscriber<R>): Subscriber<T> {
    return new MapSubscriber(subscriber, this.project);
  }
}
 
class MapSubscriber<T, R> extends Subscriber<T> {
 
  count: number = 0;
  project: (x: T, ix?: number) => R;
 
  constructor(destination: Subscriber<R>,
              project: (x: T, ix?: number) => R) {
    super(destination);
    this.project = project;
  }
 
  _next(x) {
    const result = tryCatch(this.project)(x, this.count++);
    if (result === errorObject) {
      this.error(errorObject.e);
    } else {
      this.destination.next(result);
    }
  }
}