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File: Fun.js

/**
 * Fun.js
 *
 * Released under LGPL License.
 * Copyright (c) 1999-2017 Ephox Corp. All rights reserved
 *
 * License: http://www.tinymce.com/license
 * Contributing: http://www.tinymce.com/contributing
 */

/**
 * Functional utility class.
 *
 * @private
 * @class tinymce.util.Fun
 */
define(
  'tinymce.core.util.Fun',
  [
  ],
  function () {
    var slice = [].slice;

    function constant(value) {
      return function () {
        return value;
      };
    }

    function negate(predicate) {
      return function (x) {
        return !predicate(x);
      };
    }

    function compose(f, g) {
      return function (x) {
        return f(g(x));
      };
    }

    function or() {
      var args = slice.call(arguments);

      return function (x) {
        for (var i = 0; i < args.length; i++) {
          if (args[i](x)) {
            return true;
          }
        }

        return false;
      };
    }

    function and() {
      var args = slice.call(arguments);

      return function (x) {
        for (var i = 0; i < args.length; i++) {
          if (!args[i](x)) {
            return false;
          }
        }

        return true;
      };
    }

    function curry(fn) {
      var args = slice.call(arguments);

      if (args.length - 1 >= fn.length) {
        return fn.apply(this, args.slice(1));
      }

      return function () {
        var tempArgs = args.concat([].slice.call(arguments));
        return curry.apply(this, tempArgs);
      };
    }

    function noop() {
    }

    return {
      constant: constant,
      negate: negate,
      and: and,
      or: or,
      curry: curry,
      compose: compose,
      noop: noop
    };
  }
);