@glimmer/util/dist/commonjs/es5/lib/present.js

Common utilities used in Glimmer

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.isPresent = isPresent;
exports.ifPresent = ifPresent;
exports.toPresentOption = toPresentOption;
exports.assertPresent = assertPresent;
exports.mapPresent = mapPresent;

function _createForOfIteratorHelperLoose(o, allowArrayLike) {
  var it;

  if (typeof Symbol === "undefined" || o[Symbol.iterator] == null) {
    if (Array.isArray(o) || (it = _unsupportedIterableToArray(o)) || allowArrayLike && o && typeof o.length === "number") {
      if (it) o = it;
      var i = 0;
      return function () {
        if (i >= o.length) return {
          done: true
        };
        return {
          done: false,
          value: o[i++]
        };
      };
    }

    throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
  }

  it = o[Symbol.iterator]();
  return it.next.bind(it);
}

function _unsupportedIterableToArray(o, minLen) {
  if (!o) return;
  if (typeof o === "string") return _arrayLikeToArray(o, minLen);
  var n = Object.prototype.toString.call(o).slice(8, -1);
  if (n === "Object" && o.constructor) n = o.constructor.name;
  if (n === "Map" || n === "Set") return Array.from(o);
  if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen);
}

function _arrayLikeToArray(arr, len) {
  if (len == null || len > arr.length) len = arr.length;

  for (var i = 0, arr2 = new Array(len); i < len; i++) {
    arr2[i] = arr[i];
  }

  return arr2;
}

function isPresent(list) {
  return list.length > 0;
}

function ifPresent(list, ifPresent, otherwise) {
  if (isPresent(list)) {
    return ifPresent(list);
  } else {
    return otherwise();
  }
}

function toPresentOption(list) {
  if (isPresent(list)) {
    return list;
  } else {
    return null;
  }
}

function assertPresent(list, message) {
  if (message === void 0) {
    message = "unexpected empty list";
  }

  if (!isPresent(list)) {
    throw new Error(message);
  }
}

function mapPresent(list, callback) {
  if (list === null) {
    return null;
  }

  var out = [];

  for (var _iterator = _createForOfIteratorHelperLoose(list), _step; !(_step = _iterator()).done;) {
    var item = _step.value;
    out.push(callback(item));
  }

  return out;
}
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