ducha-qianduan/node_modules/rxjs/_esm2015/internal/operators/map.js

import { Subscriber } from '../Subscriber';
export function map(project, thisArg) {
    return function mapOperation(source) {
        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 {
    constructor(project, thisArg) {
        this.project = project;
        this.thisArg = thisArg;
    }
    call(subscriber, source) {
        return source.subscribe(new MapSubscriber(subscriber, this.project, this.thisArg));
    }
}
class MapSubscriber extends Subscriber {
    constructor(destination, project, thisArg) {
        super(destination);
        this.project = project;
        this.count = 0;
        this.thisArg = thisArg || this;
    }
    _next(value) {
        let result;
        try {
            result = this.project.call(this.thisArg, value, this.count++);
        }
        catch (err) {
            this.destination.error(err);
            return;
        }
        this.destination.next(result);
    }
}
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