diff --git a/dist/bundle.js b/dist/bundle.js
index 55d35d169..53abe15d1 100644
--- a/dist/bundle.js
+++ b/dist/bundle.js
@@ -9599,7 +9599,7 @@ if ( typeof define === "function" && define.amd && define.amd.jQuery ) {
})( window );/**
* @license
* Lodash (Custom Build)
- * Build: `lodash core plus="debounce,throttle,get,findIndex,findLastIndex,findKey,findLastKey,isArrayLike,invert,invertBy,uniq,uniqBy,omit,omitBy,zip,unzip,rest,range,random,reject,intersection,drop"`
+ * Build: `lodash core plus="debounce,throttle,get,findIndex,findLastIndex,findKey,findLastKey,isArrayLike,invert,invertBy,uniq,uniqBy,omit,omitBy,zip,unzip,rest,range,random,reject,intersection,drop,countBy"`
* Copyright JS Foundation and other contributors
* Released under MIT license
* Based on Underscore.js 1.8.3
@@ -9891,6 +9891,27 @@ if ( typeof define === "function" && define.amd && define.amd.jQuery ) {
return func.apply(thisArg, args);
}
+ /**
+ * A specialized version of `baseAggregator` for arrays.
+ *
+ * @private
+ * @param {Array} [array] The array to iterate over.
+ * @param {Function} setter The function to set `accumulator` values.
+ * @param {Function} iteratee The iteratee to transform keys.
+ * @param {Object} accumulator The initial aggregated object.
+ * @returns {Function} Returns `accumulator`.
+ */
+ function arrayAggregator(array, setter, iteratee, accumulator) {
+ var index = -1,
+ length = array == null ? 0 : array.length;
+
+ while (++index < length) {
+ var value = array[index];
+ setter(accumulator, value, iteratee(value), array);
+ }
+ return accumulator;
+ }
+
/**
* A specialized version of `_.forEach` for arrays without support for
* iteratee shorthands.
@@ -11474,6 +11495,24 @@ if ( typeof define === "function" && define.amd && define.amd.jQuery ) {
return -1;
}
+ /**
+ * Aggregates elements of `collection` on `accumulator` with keys transformed
+ * by `iteratee` and values set by `setter`.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} setter The function to set `accumulator` values.
+ * @param {Function} iteratee The iteratee to transform keys.
+ * @param {Object} accumulator The initial aggregated object.
+ * @returns {Function} Returns `accumulator`.
+ */
+ function baseAggregator(collection, setter, iteratee, accumulator) {
+ baseEach(collection, function(value, key, collection) {
+ setter(accumulator, value, iteratee(value), collection);
+ });
+ return accumulator;
+ }
+
/**
* The base implementation of `_.assign` without support for multiple sources
* or `customizer` functions.
@@ -13073,6 +13112,23 @@ if ( typeof define === "function" && define.amd && define.amd.jQuery ) {
return copyObject(source, getSymbolsIn(source), object);
}
+ /**
+ * Creates a function like `_.groupBy`.
+ *
+ * @private
+ * @param {Function} setter The function to set accumulator values.
+ * @param {Function} [initializer] The accumulator object initializer.
+ * @returns {Function} Returns the new aggregator function.
+ */
+ function createAggregator(setter, initializer) {
+ return function(collection, iteratee) {
+ var func = isArray(collection) ? arrayAggregator : baseAggregator,
+ accumulator = initializer ? initializer() : {};
+
+ return func(collection, setter, baseIteratee(iteratee, 2), accumulator);
+ };
+ }
+
/**
* Creates a function like `_.assign`.
*
@@ -15545,6 +15601,36 @@ if ( typeof define === "function" && define.amd && define.amd.jQuery ) {
/*------------------------------------------------------------------------*/
+ /**
+ * Creates an object composed of keys generated from the results of running
+ * each element of `collection` thru `iteratee`. The corresponding value of
+ * each key is the number of times the key was returned by `iteratee`. The
+ * iteratee is invoked with one argument: (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 0.5.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
+ * @returns {Object} Returns the composed aggregate object.
+ * @example
+ *
+ * _.countBy([6.1, 4.2, 6.3], Math.floor);
+ * // => { '4': 1, '6': 2 }
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.countBy(['one', 'two', 'three'], 'length');
+ * // => { '3': 2, '5': 1 }
+ */
+ var countBy = createAggregator(function(result, value, key) {
+ if (hasOwnProperty.call(result, key)) {
+ ++result[key];
+ } else {
+ baseAssignValue(result, key, 1);
+ }
+ });
+
/**
* Checks if `predicate` returns truthy for **all** elements of `collection`.
* Iteration is stopped once `predicate` returns falsey. The predicate is
@@ -18571,6 +18657,7 @@ if ( typeof define === "function" && define.amd && define.amd.jQuery ) {
lodash.chain = chain;
lodash.compact = compact;
lodash.concat = concat;
+ lodash.countBy = countBy;
lodash.create = create;
lodash.debounce = debounce;
lodash.defaults = defaults;
diff --git a/dist/core.js b/dist/core.js
index c16fa0090..88a59f14f 100644
--- a/dist/core.js
+++ b/dist/core.js
@@ -9599,7 +9599,7 @@ if ( typeof define === "function" && define.amd && define.amd.jQuery ) {
})( window );/**
* @license
* Lodash (Custom Build)
- * Build: `lodash core plus="debounce,throttle,get,findIndex,findLastIndex,findKey,findLastKey,isArrayLike,invert,invertBy,uniq,uniqBy,omit,omitBy,zip,unzip,rest,range,random,reject,intersection,drop"`
+ * Build: `lodash core plus="debounce,throttle,get,findIndex,findLastIndex,findKey,findLastKey,isArrayLike,invert,invertBy,uniq,uniqBy,omit,omitBy,zip,unzip,rest,range,random,reject,intersection,drop,countBy"`
* Copyright JS Foundation and other contributors
* Released under MIT license
* Based on Underscore.js 1.8.3
@@ -9891,6 +9891,27 @@ if ( typeof define === "function" && define.amd && define.amd.jQuery ) {
return func.apply(thisArg, args);
}
+ /**
+ * A specialized version of `baseAggregator` for arrays.
+ *
+ * @private
+ * @param {Array} [array] The array to iterate over.
+ * @param {Function} setter The function to set `accumulator` values.
+ * @param {Function} iteratee The iteratee to transform keys.
+ * @param {Object} accumulator The initial aggregated object.
+ * @returns {Function} Returns `accumulator`.
+ */
+ function arrayAggregator(array, setter, iteratee, accumulator) {
+ var index = -1,
+ length = array == null ? 0 : array.length;
+
+ while (++index < length) {
+ var value = array[index];
+ setter(accumulator, value, iteratee(value), array);
+ }
+ return accumulator;
+ }
+
/**
* A specialized version of `_.forEach` for arrays without support for
* iteratee shorthands.
@@ -11474,6 +11495,24 @@ if ( typeof define === "function" && define.amd && define.amd.jQuery ) {
return -1;
}
+ /**
+ * Aggregates elements of `collection` on `accumulator` with keys transformed
+ * by `iteratee` and values set by `setter`.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} setter The function to set `accumulator` values.
+ * @param {Function} iteratee The iteratee to transform keys.
+ * @param {Object} accumulator The initial aggregated object.
+ * @returns {Function} Returns `accumulator`.
+ */
+ function baseAggregator(collection, setter, iteratee, accumulator) {
+ baseEach(collection, function(value, key, collection) {
+ setter(accumulator, value, iteratee(value), collection);
+ });
+ return accumulator;
+ }
+
/**
* The base implementation of `_.assign` without support for multiple sources
* or `customizer` functions.
@@ -13073,6 +13112,23 @@ if ( typeof define === "function" && define.amd && define.amd.jQuery ) {
return copyObject(source, getSymbolsIn(source), object);
}
+ /**
+ * Creates a function like `_.groupBy`.
+ *
+ * @private
+ * @param {Function} setter The function to set accumulator values.
+ * @param {Function} [initializer] The accumulator object initializer.
+ * @returns {Function} Returns the new aggregator function.
+ */
+ function createAggregator(setter, initializer) {
+ return function(collection, iteratee) {
+ var func = isArray(collection) ? arrayAggregator : baseAggregator,
+ accumulator = initializer ? initializer() : {};
+
+ return func(collection, setter, baseIteratee(iteratee, 2), accumulator);
+ };
+ }
+
/**
* Creates a function like `_.assign`.
*
@@ -15545,6 +15601,36 @@ if ( typeof define === "function" && define.amd && define.amd.jQuery ) {
/*------------------------------------------------------------------------*/
+ /**
+ * Creates an object composed of keys generated from the results of running
+ * each element of `collection` thru `iteratee`. The corresponding value of
+ * each key is the number of times the key was returned by `iteratee`. The
+ * iteratee is invoked with one argument: (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 0.5.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
+ * @returns {Object} Returns the composed aggregate object.
+ * @example
+ *
+ * _.countBy([6.1, 4.2, 6.3], Math.floor);
+ * // => { '4': 1, '6': 2 }
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.countBy(['one', 'two', 'three'], 'length');
+ * // => { '3': 2, '5': 1 }
+ */
+ var countBy = createAggregator(function(result, value, key) {
+ if (hasOwnProperty.call(result, key)) {
+ ++result[key];
+ } else {
+ baseAssignValue(result, key, 1);
+ }
+ });
+
/**
* Checks if `predicate` returns truthy for **all** elements of `collection`.
* Iteration is stopped once `predicate` returns falsey. The predicate is
@@ -18571,6 +18657,7 @@ if ( typeof define === "function" && define.amd && define.amd.jQuery ) {
lodash.chain = chain;
lodash.compact = compact;
lodash.concat = concat;
+ lodash.countBy = countBy;
lodash.create = create;
lodash.debounce = debounce;
lodash.defaults = defaults;
diff --git a/dist/fineui.js b/dist/fineui.js
index a28fdef87..3402a900c 100644
--- a/dist/fineui.js
+++ b/dist/fineui.js
@@ -9800,7 +9800,7 @@ if ( typeof define === "function" && define.amd && define.amd.jQuery ) {
})( window );/**
* @license
* Lodash (Custom Build)
- * Build: `lodash core plus="debounce,throttle,get,findIndex,findLastIndex,findKey,findLastKey,isArrayLike,invert,invertBy,uniq,uniqBy,omit,omitBy,zip,unzip,rest,range,random,reject,intersection,drop"`
+ * Build: `lodash core plus="debounce,throttle,get,findIndex,findLastIndex,findKey,findLastKey,isArrayLike,invert,invertBy,uniq,uniqBy,omit,omitBy,zip,unzip,rest,range,random,reject,intersection,drop,countBy"`
* Copyright JS Foundation and other contributors
* Released under MIT license
* Based on Underscore.js 1.8.3
@@ -10092,6 +10092,27 @@ if ( typeof define === "function" && define.amd && define.amd.jQuery ) {
return func.apply(thisArg, args);
}
+ /**
+ * A specialized version of `baseAggregator` for arrays.
+ *
+ * @private
+ * @param {Array} [array] The array to iterate over.
+ * @param {Function} setter The function to set `accumulator` values.
+ * @param {Function} iteratee The iteratee to transform keys.
+ * @param {Object} accumulator The initial aggregated object.
+ * @returns {Function} Returns `accumulator`.
+ */
+ function arrayAggregator(array, setter, iteratee, accumulator) {
+ var index = -1,
+ length = array == null ? 0 : array.length;
+
+ while (++index < length) {
+ var value = array[index];
+ setter(accumulator, value, iteratee(value), array);
+ }
+ return accumulator;
+ }
+
/**
* A specialized version of `_.forEach` for arrays without support for
* iteratee shorthands.
@@ -11675,6 +11696,24 @@ if ( typeof define === "function" && define.amd && define.amd.jQuery ) {
return -1;
}
+ /**
+ * Aggregates elements of `collection` on `accumulator` with keys transformed
+ * by `iteratee` and values set by `setter`.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} setter The function to set `accumulator` values.
+ * @param {Function} iteratee The iteratee to transform keys.
+ * @param {Object} accumulator The initial aggregated object.
+ * @returns {Function} Returns `accumulator`.
+ */
+ function baseAggregator(collection, setter, iteratee, accumulator) {
+ baseEach(collection, function(value, key, collection) {
+ setter(accumulator, value, iteratee(value), collection);
+ });
+ return accumulator;
+ }
+
/**
* The base implementation of `_.assign` without support for multiple sources
* or `customizer` functions.
@@ -13274,6 +13313,23 @@ if ( typeof define === "function" && define.amd && define.amd.jQuery ) {
return copyObject(source, getSymbolsIn(source), object);
}
+ /**
+ * Creates a function like `_.groupBy`.
+ *
+ * @private
+ * @param {Function} setter The function to set accumulator values.
+ * @param {Function} [initializer] The accumulator object initializer.
+ * @returns {Function} Returns the new aggregator function.
+ */
+ function createAggregator(setter, initializer) {
+ return function(collection, iteratee) {
+ var func = isArray(collection) ? arrayAggregator : baseAggregator,
+ accumulator = initializer ? initializer() : {};
+
+ return func(collection, setter, baseIteratee(iteratee, 2), accumulator);
+ };
+ }
+
/**
* Creates a function like `_.assign`.
*
@@ -15746,6 +15802,36 @@ if ( typeof define === "function" && define.amd && define.amd.jQuery ) {
/*------------------------------------------------------------------------*/
+ /**
+ * Creates an object composed of keys generated from the results of running
+ * each element of `collection` thru `iteratee`. The corresponding value of
+ * each key is the number of times the key was returned by `iteratee`. The
+ * iteratee is invoked with one argument: (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 0.5.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
+ * @returns {Object} Returns the composed aggregate object.
+ * @example
+ *
+ * _.countBy([6.1, 4.2, 6.3], Math.floor);
+ * // => { '4': 1, '6': 2 }
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.countBy(['one', 'two', 'three'], 'length');
+ * // => { '3': 2, '5': 1 }
+ */
+ var countBy = createAggregator(function(result, value, key) {
+ if (hasOwnProperty.call(result, key)) {
+ ++result[key];
+ } else {
+ baseAssignValue(result, key, 1);
+ }
+ });
+
/**
* Checks if `predicate` returns truthy for **all** elements of `collection`.
* Iteration is stopped once `predicate` returns falsey. The predicate is
@@ -18772,6 +18858,7 @@ if ( typeof define === "function" && define.amd && define.amd.jQuery ) {
lodash.chain = chain;
lodash.compact = compact;
lodash.concat = concat;
+ lodash.countBy = countBy;
lodash.create = create;
lodash.debounce = debounce;
lodash.defaults = defaults;
diff --git a/lodash.md b/lodash.md
index 5528dbd7b..49a00ce30 100644
--- a/lodash.md
+++ b/lodash.md
@@ -1 +1 @@
-lodash core plus=debounce,throttle,get,findIndex,findLastIndex,findKey,findLastKey,isArrayLike,invert,invertBy,uniq,uniqBy,omit,omitBy,zip,unzip,rest,range,random,reject,intersection,drop
\ No newline at end of file
+lodash core plus=debounce,throttle,get,findIndex,findLastIndex,findKey,findLastKey,isArrayLike,invert,invertBy,uniq,uniqBy,omit,omitBy,zip,unzip,rest,range,random,reject,intersection,drop,countBy
\ No newline at end of file
diff --git a/src/core/lodash.js b/src/core/lodash.js
index e98cff783..c0dd7459a 100644
--- a/src/core/lodash.js
+++ b/src/core/lodash.js
@@ -1,7 +1,7 @@
/**
* @license
* Lodash (Custom Build)
- * Build: `lodash core plus="debounce,throttle,get,findIndex,findLastIndex,findKey,findLastKey,isArrayLike,invert,invertBy,uniq,uniqBy,omit,omitBy,zip,unzip,rest,range,random,reject,intersection,drop"`
+ * Build: `lodash core plus="debounce,throttle,get,findIndex,findLastIndex,findKey,findLastKey,isArrayLike,invert,invertBy,uniq,uniqBy,omit,omitBy,zip,unzip,rest,range,random,reject,intersection,drop,countBy"`
* Copyright JS Foundation and other contributors
* Released under MIT license
* Based on Underscore.js 1.8.3
@@ -293,6 +293,27 @@
return func.apply(thisArg, args);
}
+ /**
+ * A specialized version of `baseAggregator` for arrays.
+ *
+ * @private
+ * @param {Array} [array] The array to iterate over.
+ * @param {Function} setter The function to set `accumulator` values.
+ * @param {Function} iteratee The iteratee to transform keys.
+ * @param {Object} accumulator The initial aggregated object.
+ * @returns {Function} Returns `accumulator`.
+ */
+ function arrayAggregator(array, setter, iteratee, accumulator) {
+ var index = -1,
+ length = array == null ? 0 : array.length;
+
+ while (++index < length) {
+ var value = array[index];
+ setter(accumulator, value, iteratee(value), array);
+ }
+ return accumulator;
+ }
+
/**
* A specialized version of `_.forEach` for arrays without support for
* iteratee shorthands.
@@ -1876,6 +1897,24 @@
return -1;
}
+ /**
+ * Aggregates elements of `collection` on `accumulator` with keys transformed
+ * by `iteratee` and values set by `setter`.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} setter The function to set `accumulator` values.
+ * @param {Function} iteratee The iteratee to transform keys.
+ * @param {Object} accumulator The initial aggregated object.
+ * @returns {Function} Returns `accumulator`.
+ */
+ function baseAggregator(collection, setter, iteratee, accumulator) {
+ baseEach(collection, function(value, key, collection) {
+ setter(accumulator, value, iteratee(value), collection);
+ });
+ return accumulator;
+ }
+
/**
* The base implementation of `_.assign` without support for multiple sources
* or `customizer` functions.
@@ -3475,6 +3514,23 @@
return copyObject(source, getSymbolsIn(source), object);
}
+ /**
+ * Creates a function like `_.groupBy`.
+ *
+ * @private
+ * @param {Function} setter The function to set accumulator values.
+ * @param {Function} [initializer] The accumulator object initializer.
+ * @returns {Function} Returns the new aggregator function.
+ */
+ function createAggregator(setter, initializer) {
+ return function(collection, iteratee) {
+ var func = isArray(collection) ? arrayAggregator : baseAggregator,
+ accumulator = initializer ? initializer() : {};
+
+ return func(collection, setter, baseIteratee(iteratee, 2), accumulator);
+ };
+ }
+
/**
* Creates a function like `_.assign`.
*
@@ -5947,6 +6003,36 @@
/*------------------------------------------------------------------------*/
+ /**
+ * Creates an object composed of keys generated from the results of running
+ * each element of `collection` thru `iteratee`. The corresponding value of
+ * each key is the number of times the key was returned by `iteratee`. The
+ * iteratee is invoked with one argument: (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 0.5.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
+ * @returns {Object} Returns the composed aggregate object.
+ * @example
+ *
+ * _.countBy([6.1, 4.2, 6.3], Math.floor);
+ * // => { '4': 1, '6': 2 }
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.countBy(['one', 'two', 'three'], 'length');
+ * // => { '3': 2, '5': 1 }
+ */
+ var countBy = createAggregator(function(result, value, key) {
+ if (hasOwnProperty.call(result, key)) {
+ ++result[key];
+ } else {
+ baseAssignValue(result, key, 1);
+ }
+ });
+
/**
* Checks if `predicate` returns truthy for **all** elements of `collection`.
* Iteration is stopped once `predicate` returns falsey. The predicate is
@@ -8973,6 +9059,7 @@
lodash.chain = chain;
lodash.compact = compact;
lodash.concat = concat;
+ lodash.countBy = countBy;
lodash.create = create;
lodash.debounce = debounce;
lodash.defaults = defaults;
diff --git a/utils/utils.js b/utils/utils.js
index 0320ab342..7642e6de1 100644
--- a/utils/utils.js
+++ b/utils/utils.js
@@ -1,7 +1,7 @@
/**
* @license
* Lodash (Custom Build)
- * Build: `lodash core plus="debounce,throttle,get,findIndex,findLastIndex,findKey,findLastKey,isArrayLike,invert,invertBy,uniq,uniqBy,omit,omitBy,zip,unzip,rest,range,random,reject,intersection,drop"`
+ * Build: `lodash core plus="debounce,throttle,get,findIndex,findLastIndex,findKey,findLastKey,isArrayLike,invert,invertBy,uniq,uniqBy,omit,omitBy,zip,unzip,rest,range,random,reject,intersection,drop,countBy"`
* Copyright JS Foundation and other contributors
* Released under MIT license
* Based on Underscore.js 1.8.3
@@ -293,6 +293,27 @@
return func.apply(thisArg, args);
}
+ /**
+ * A specialized version of `baseAggregator` for arrays.
+ *
+ * @private
+ * @param {Array} [array] The array to iterate over.
+ * @param {Function} setter The function to set `accumulator` values.
+ * @param {Function} iteratee The iteratee to transform keys.
+ * @param {Object} accumulator The initial aggregated object.
+ * @returns {Function} Returns `accumulator`.
+ */
+ function arrayAggregator(array, setter, iteratee, accumulator) {
+ var index = -1,
+ length = array == null ? 0 : array.length;
+
+ while (++index < length) {
+ var value = array[index];
+ setter(accumulator, value, iteratee(value), array);
+ }
+ return accumulator;
+ }
+
/**
* A specialized version of `_.forEach` for arrays without support for
* iteratee shorthands.
@@ -1876,6 +1897,24 @@
return -1;
}
+ /**
+ * Aggregates elements of `collection` on `accumulator` with keys transformed
+ * by `iteratee` and values set by `setter`.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} setter The function to set `accumulator` values.
+ * @param {Function} iteratee The iteratee to transform keys.
+ * @param {Object} accumulator The initial aggregated object.
+ * @returns {Function} Returns `accumulator`.
+ */
+ function baseAggregator(collection, setter, iteratee, accumulator) {
+ baseEach(collection, function(value, key, collection) {
+ setter(accumulator, value, iteratee(value), collection);
+ });
+ return accumulator;
+ }
+
/**
* The base implementation of `_.assign` without support for multiple sources
* or `customizer` functions.
@@ -3475,6 +3514,23 @@
return copyObject(source, getSymbolsIn(source), object);
}
+ /**
+ * Creates a function like `_.groupBy`.
+ *
+ * @private
+ * @param {Function} setter The function to set accumulator values.
+ * @param {Function} [initializer] The accumulator object initializer.
+ * @returns {Function} Returns the new aggregator function.
+ */
+ function createAggregator(setter, initializer) {
+ return function(collection, iteratee) {
+ var func = isArray(collection) ? arrayAggregator : baseAggregator,
+ accumulator = initializer ? initializer() : {};
+
+ return func(collection, setter, baseIteratee(iteratee, 2), accumulator);
+ };
+ }
+
/**
* Creates a function like `_.assign`.
*
@@ -5947,6 +6003,36 @@
/*------------------------------------------------------------------------*/
+ /**
+ * Creates an object composed of keys generated from the results of running
+ * each element of `collection` thru `iteratee`. The corresponding value of
+ * each key is the number of times the key was returned by `iteratee`. The
+ * iteratee is invoked with one argument: (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 0.5.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
+ * @returns {Object} Returns the composed aggregate object.
+ * @example
+ *
+ * _.countBy([6.1, 4.2, 6.3], Math.floor);
+ * // => { '4': 1, '6': 2 }
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.countBy(['one', 'two', 'three'], 'length');
+ * // => { '3': 2, '5': 1 }
+ */
+ var countBy = createAggregator(function(result, value, key) {
+ if (hasOwnProperty.call(result, key)) {
+ ++result[key];
+ } else {
+ baseAssignValue(result, key, 1);
+ }
+ });
+
/**
* Checks if `predicate` returns truthy for **all** elements of `collection`.
* Iteration is stopped once `predicate` returns falsey. The predicate is
@@ -8973,6 +9059,7 @@
lodash.chain = chain;
lodash.compact = compact;
lodash.concat = concat;
+ lodash.countBy = countBy;
lodash.create = create;
lodash.debounce = debounce;
lodash.defaults = defaults;