# all files / src/js/base/core/ func.js

94.55% Statements 52/55
64.29% Branches 9/14
95.45% Functions 21/22
94.55% Lines 52/55

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     /**
     * @class core.func
     *
     * func utils (for high-order func's arg)
     *
     * @singleton
     * @alternateClassName func
     */
    function eq(itemA) {
      return function(itemB) {
        return itemA === itemB;
      };
    }

    function eq2(itemA, itemB) {
      return itemA === itemB;
    }

    function peq2(propName) {
      return function(itemA, itemB) {
        return itemA[propName] === itemB[propName];
      };
    }

    function ok() {
      return true;
    }

    function fail() {
      return false;
    }

    function not(f) {
      return function() {
        return !f.apply(f, arguments);
      };
    }

    function and(fA, fB) {
      return function(item) {
        return fA(item) && fB(item);
      };
    }

    function self(a) {
      return a;
    }

    function invoke(obj, method) {
      return function() {
        return obj[method].apply(obj, arguments);
      };
    }

    let idCounter = 0;

    /**
     * generate a globally-unique id
     *
     * @param {String} [prefix]
     */
    function uniqueId(prefix) {
      const id = ++idCounter + '';
      return prefix ? prefix + id : id;
    }

    /**
     * returns bnd (bounds) from rect
     *
     * - IE Compatibility Issue: http://goo.gl/sRLOAo
     * - Scroll Issue: http://goo.gl/sNjUc
     *
     * @param {Rect} rect
     * @return {Object} bounds
     * @return {Number} bounds.top
     * @return {Number} bounds.left
     * @return {Number} bounds.width
     * @return {Number} bounds.height
     */
    function rect2bnd(rect) {
      const $document = $(document);
      return {
        top: rect.top + $document.scrollTop(),
        left: rect.left + $document.scrollLeft(),
        width: rect.right - rect.left,
        height: rect.bottom - rect.top
      };
    }

    /**
     * returns a copy of the object where the keys have become the values and the values the keys.
     * @param {Object} obj
     * @return {Object}
     */
    function invertObject(obj) {
      const inverted = {};
      for (const key in obj) {
        Eif (obj.hasOwnProperty(key)) {
          inverted[obj[key]] = key;
        }
      }
      return inverted;
    }

    /**
     * @param {String} namespace
     * @param {String} [prefix]
     * @return {String}
     */
    function namespaceToCamel(namespace, prefix) {
      prefix = prefix || '';
      return prefix + namespace.split('.').map(function(name) {
        return name.substring(0, 1).toUpperCase() + name.substring(1);
      }).join('');
    }

    /**
     * Returns a function, that, as long as it continues to be invoked, will not
     * be triggered. The function will be called after it stops being called for
     * N milliseconds. If `immediate` is passed, trigger the function on the
     * leading edge, instead of the trailing.
     * @param {Function} func
     * @param {Number} wait
     * @param {Boolean} immediate
     * @return {Function}
     */
    function debounce(func, wait, immediate) {
      let timeout;
      return function() {
        const context = this;
        const args = arguments;
        const later = () => {
          timeout = null;
          Eif (!immediate) {
            func.apply(context, args);
          }
        };
        const callNow = immediate && !timeout;
        clearTimeout(timeout);
        timeout = setTimeout(later, wait);
        Iif (callNow) {
          func.apply(context, args);
        }
      };
    }

    export default {
      eq,
      eq2,
      peq2,
      ok,
      fail,
      self,
      not,
      and,
      invoke,
      uniqueId,
      rect2bnd,
      invertObject,
      namespaceToCamel,
      debounce
    };