multitude/dist/push/operators/filter/take.js

Comprehensive streams for push and pull

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.take = take;

var _operate = require("../../utils/operate");

var _typeCore = require("type-core");

function take(count) {
  const options = !count || _typeCore.TypeGuard.isNumber(count) ? {
    count
  } : count;
  return (0, _operate.operate)(obs => {
    let index = -1;
    return {
      next(value) {
        index++;

        if (options.count && index < options.count) {
          obs.next(value);
          return !options.while && index + 1 >= options.count ? obs.complete() : undefined;
        }

        if (options.while && options.while(value, index)) {
          return obs.next(value);
        }

        return obs.complete();
      }

    };
  });
}
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