prepack/lib/intrinsics/ecma262/isNaN.js

Execute a JS bundle, serialize global state and side effects to a snapshot that can be quickly restored.

"use strict";

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

var _index = require("../../values/index.js");

var _singletons = require("../../singletons.js");

/**
 * Copyright (c) 2017-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

/*  strict-local */
function _default(realm) {
  // ECMA262 18.2.3
  return new _index.NativeFunctionValue(realm, "isNaN", "isNaN", 1, (context, [number]) => {
    // 1. Let num be ? ToNumber(number).
    let num = _singletons.To.ToNumber(realm, number); // 2. If num is NaN, return true.


    if (isNaN(num)) return realm.intrinsics.true; // 3. Otherwise, return false.

    return realm.intrinsics.false;
  }, false);
}
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