react app

react-app/node_modules/lodash/object/transform.js

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+var arrayEach = require('../internal/arrayEach'),
+    baseCallback = require('../internal/baseCallback'),
+    baseCreate = require('../internal/baseCreate'),
+    baseForOwn = require('../internal/baseForOwn'),
+    isArray = require('../lang/isArray'),
+    isFunction = require('../lang/isFunction'),
+    isObject = require('../lang/isObject'),
+    isTypedArray = require('../lang/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
+ * properties through `iteratee`, with each invocation potentially mutating
+ * the `accumulator` object. The `iteratee` is bound to `thisArg` and invoked
+ * with four arguments: (accumulator, value, key, object). Iteratee functions
+ * may exit iteration early by explicitly returning `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Array|Object} object The object to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @param {*} [accumulator] The custom accumulator value.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @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 }, function(result, n, key) {
+ *   result[key] = n * 3;
+ * });
+ * // => { 'a': 3, 'b': 6 }
+ */
+function transform(object, iteratee, accumulator, thisArg) {
+  var isArr = isArray(object) || isTypedArray(object);
+  iteratee = baseCallback(iteratee, thisArg, 4);
+
+  if (accumulator == null) {
+    if (isArr || isObject(object)) {
+      var Ctor = object.constructor;
+      if (isArr) {
+        accumulator = isArray(object) ? new Ctor : [];
+      } else {
+        accumulator = baseCreate(isFunction(Ctor) ? Ctor.prototype : undefined);
+      }
+    } else {
+      accumulator = {};
+    }
+  }
+  (isArr ? arrayEach : baseForOwn)(object, function(value, index, object) {
+    return iteratee(accumulator, value, index, object);
+  });
+  return accumulator;
+}
+
+module.exports = transform;