"use strict"
var __createBinding =
  (this && this.__createBinding) ||
  (Object.create
    ? function (o, m, k, k2) {
        if (k2 === undefined) k2 = k
        Object.defineProperty(o, k2, {
          enumerable: true,
          get: function () {
            return m[k]
          }
        })
      }
    : function (o, m, k, k2) {
        if (k2 === undefined) k2 = k
        o[k2] = m[k]
      })
var __setModuleDefault =
  (this && this.__setModuleDefault) ||
  (Object.create
    ? function (o, v) {
        Object.defineProperty(o, "default", { enumerable: true, value: v })
      }
    : function (o, v) {
        o["default"] = v
      })
var __importStar =
  (this && this.__importStar) ||
  function (mod) {
    if (mod && mod.__esModule) return mod
    var result = {}
    if (mod != null)
      for (var k in mod)
        if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k))
          __createBinding(result, mod, k)
    __setModuleDefault(result, mod)
    return result
  }
Object.defineProperty(exports, "__esModule", { value: true })
exports.head = void 0
// tracing: off
const Cause_1 = require("../Cause")
const O = __importStar(require("../Option"))
const core_1 = require("./core")
const fail_1 = require("./fail")
/**
 * Returns a successful effect with the head of the list if the list is
 * non-empty or fails with the error `None` if the list is empty.
 */
function head(self, __trace) {
  return (0, core_1.foldCauseM_)(
    self,
    (x) => (0, core_1.halt)((0, Cause_1.map_)(x, O.some)),
    (x) => {
      const it = x[Symbol.iterator]()
      const next = it.next()
      return next.done ? (0, fail_1.fail)(O.none) : (0, core_1.succeed)(next.value)
    },
    __trace
  )
}
exports.head = head
//# sourceMappingURL=head.js.map
