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qwen/nodejs/node_modules/lodash/transform.js

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+var arrayEach = require('./_arrayEach'),
+    baseCreate = require('./_baseCreate'),
+    baseForOwn = require('./_baseForOwn'),
+    baseIteratee = require('./_baseIteratee'),
+    getPrototype = require('./_getPrototype'),
+    isArray = require('./isArray'),
+    isBuffer = require('./isBuffer'),
+    isFunction = require('./isFunction'),
+    isObject = require('./isObject'),
+    isTypedArray = require('./isTypedArray');
+
+/**
+ * An alternative to `_.reduce`; this method transforms `object` to a new
+ * `accumulator` object which is the result of running each of its own
+ * enumerable string keyed properties thru `iteratee`, with each invocation
+ * potentially mutating the `accumulator` object. If `accumulator` is not
+ * provided, a new object with the same `[[Prototype]]` will be used. The
+ * iteratee is invoked with four arguments: (accumulator, value, key, object).
+ * Iteratee functions may exit iteration early by explicitly returning `false`.
+ *
+ * @static
+ * @memberOf _
+ * @since 1.3.0
+ * @category Object
+ * @param {Object} object The object to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @param {*} [accumulator] The custom accumulator value.
+ * @returns {*} Returns the accumulated value.
+ * @example
+ *
+ * _.transform([2, 3, 4], function(result, n) {
+ *   result.push(n *= n);
+ *   return n % 2 == 0;
+ * }, []);
+ * // => [4, 9]
+ *
+ * _.transform({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) {
+ *   (result[value] || (result[value] = [])).push(key);
+ * }, {});
+ * // => { '1': ['a', 'c'], '2': ['b'] }
+ */
+function transform(object, iteratee, accumulator) {
+  var isArr = isArray(object),
+      isArrLike = isArr || isBuffer(object) || isTypedArray(object);
+
+  iteratee = baseIteratee(iteratee, 4);
+  if (accumulator == null) {
+    var Ctor = object && object.constructor;
+    if (isArrLike) {
+      accumulator = isArr ? new Ctor : [];
+    }
+    else if (isObject(object)) {
+      accumulator = isFunction(Ctor) ? baseCreate(getPrototype(object)) : {};
+    }
+    else {
+      accumulator = {};
+    }
+  }
+  (isArrLike ? arrayEach : baseForOwn)(object, function(value, index, object) {
+    return iteratee(accumulator, value, index, object);
+  });
+  return accumulator;
+}
+
+module.exports = transform;