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[yaffs-website] / node_modules / grunt-legacy-log / node_modules / lodash / collection / countBy.js

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+var createAggregator = require('../internal/createAggregator');
+
+/** Used for native method references. */
+var objectProto = Object.prototype;
+
+/** Used to check objects for own properties. */
+var hasOwnProperty = objectProto.hasOwnProperty;
+
+/**
+ * Creates an object composed of keys generated from the results of running
+ * each element of `collection` through `iteratee`. The corresponding value
+ * of each key is the number of times the key was returned by `iteratee`.
+ * The `iteratee` is bound to `thisArg` and invoked with three arguments:
+ * (value, index|key, collection).
+ *
+ * If a property name is provided for `iteratee` the created `_.property`
+ * style callback returns the property value of the given element.
+ *
+ * If a value is also provided for `thisArg` the created `_.matchesProperty`
+ * style callback returns `true` for elements that have a matching property
+ * value, else `false`.
+ *
+ * If an object is provided for `iteratee` the created `_.matches` style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function|Object|string} [iteratee=_.identity] The function invoked
+ *  per iteration.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Object} Returns the composed aggregate object.
+ * @example
+ *
+ * _.countBy([4.3, 6.1, 6.4], function(n) {
+ *   return Math.floor(n);
+ * });
+ * // => { '4': 1, '6': 2 }
+ *
+ * _.countBy([4.3, 6.1, 6.4], function(n) {
+ *   return this.floor(n);
+ * }, Math);
+ * // => { '4': 1, '6': 2 }
+ *
+ * _.countBy(['one', 'two', 'three'], 'length');
+ * // => { '3': 2, '5': 1 }
+ */
+var countBy = createAggregator(function(result, value, key) {
+  hasOwnProperty.call(result, key) ? ++result[key] : (result[key] = 1);
+});
+
+module.exports = countBy;