Function createFlow

test-app/public/sinon.js:15702–15754

* Creates a `_.flow` or `_.flowRight` function. * * @private * @param {boolean} [fromRight] Specify iterating from right to left. * @returns {Function} Returns the new flow function.

(fromRight)

         * @returns {Function} Returns the new flow function.
         */
        function createFlow(fromRight) {
          return flatRest(function(funcs) {
            var length = funcs.length,
                index = length,
                prereq = LodashWrapper.prototype.thru;
    
            if (fromRight) {
              funcs.reverse();
            }
            while (index--) {
              var func = funcs[index];
              if (typeof func != 'function') {
                throw new TypeError(FUNC_ERROR_TEXT);
              }
              if (prereq && !wrapper && getFuncName(func) == 'wrapper') {
                var wrapper = new LodashWrapper([], true);
              }
            }
            index = wrapper ? index : length;
            while (++index < length) {
              func = funcs[index];
    
              var funcName = getFuncName(func),
                  data = funcName == 'wrapper' ? getData(func) : undefined;
    
              if (data && isLaziable(data[0]) &&
                    data[1] == (WRAP_ARY_FLAG | WRAP_CURRY_FLAG | WRAP_PARTIAL_FLAG | WRAP_REARG_FLAG) &&
                    !data[4].length && data[9] == 1
                  ) {
                wrapper = wrapper[getFuncName(data[0])].apply(wrapper, data[3]);
              } else {
                wrapper = (func.length == 1 && isLaziable(func))
                  ? wrapper[funcName]()
                  : wrapper.thru(func);
              }
            }
            return function() {
              var args = arguments,
                  value = args[0];
    
              if (wrapper && args.length == 1 && isArray(value)) {
                return wrapper.plant(value).value();
              }
              var index = 0,
                  result = length ? funcs[index].apply(this, args) : value;
    
              while (++index < length) {
                result = funcs[index].call(this, result);
              }
              return result;
            };
          });
        }
    
        /**
         * Creates a function that wraps `func` to invoke it with optional `this`