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Move _.max & _.min to Math category & make _.sum work on collections.

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jdalton
2015-02-27 09:20:57 -08:00
parent e914b83a1b
commit 68942f7ec4
2 changed files with 127 additions and 107 deletions
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214
lodash.src.js
View File

@@ -6408,104 +6408,6 @@
return func(collection, iteratee);
}
/**
* Gets the maximum value of `collection`. If `collection` is empty or falsey
* `-Infinity` is returned. If an iteratee function is provided it is invoked
* for each value in `collection` to generate the criterion by which the value
* is ranked. The `iteratee` is bound to `thisArg` and invoked with three
* arguments; (value, index, collection).
*
* If a property name is provided for `predicate` 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 `predicate` 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] The function invoked per iteration.
* @param {*} [thisArg] The `this` binding of `iteratee`.
* @returns {*} Returns the maximum value.
* @example
*
* _.max([4, 2, 8, 6]);
* // => 8
*
* _.max([]);
* // => -Infinity
*
* var users = [
* { 'user': 'barney', 'age': 36 },
* { 'user': 'fred', 'age': 40 }
* ];
*
* _.max(users, function(chr) {
* return chr.age;
* });
* // => { 'user': 'fred', 'age': 40 };
*
* // using the `_.property` callback shorthand
* _.max(users, 'age');
* // => { 'user': 'fred', 'age': 40 };
*/
var max = createExtremum(arrayMax);
/**
* Gets the minimum value of `collection`. If `collection` is empty or falsey
* `Infinity` is returned. If an iteratee function is provided it is invoked
* for each value in `collection` to generate the criterion by which the value
* is ranked. The `iteratee` is bound to `thisArg` and invoked with three
* arguments; (value, index, collection).
*
* If a property name is provided for `predicate` 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 `predicate` 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] The function invoked per iteration.
* @param {*} [thisArg] The `this` binding of `iteratee`.
* @returns {*} Returns the minimum value.
* @example
*
* _.min([4, 2, 8, 6]);
* // => 2
*
* _.min([]);
* // => Infinity
*
* var users = [
* { 'user': 'barney', 'age': 36 },
* { 'user': 'fred', 'age': 40 }
* ];
*
* _.min(users, function(chr) {
* return chr.age;
* });
* // => { 'user': 'barney', 'age': 36 };
*
* // using the `_.property` callback shorthand
* _.min(users, 'age');
* // => { 'user': 'barney', 'age': 36 };
*/
var min = createExtremum(arrayMin, true);
/**
* Creates an array of elements split into two groups, the first of which
* contains elements `predicate` returns truthy for, while the second of which
@@ -11178,24 +11080,128 @@
}
/**
* Calculates the sum of an array of numbers.
* Gets the maximum value of `collection`. If `collection` is empty or falsey
* `-Infinity` is returned. If an iteratee function is provided it is invoked
* for each value in `collection` to generate the criterion by which the value
* is ranked. The `iteratee` is bound to `thisArg` and invoked with three
* arguments; (value, index, collection).
*
* If a property name is provided for `predicate` 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 `predicate` the created `_.matches` style
* callback returns `true` for elements that have the properties of the given
* object, else `false`.
*
* @static
* @memberOf _
* @category Math
* @param {number} array The numbers to add.
* @returns {number} Returns the sum.
* @param {Array|Object|string} collection The collection to iterate over.
* @param {Function|Object|string} [iteratee] The function invoked per iteration.
* @param {*} [thisArg] The `this` binding of `iteratee`.
* @returns {*} Returns the maximum value.
* @example
*
* _.max([4, 2, 8, 6]);
* // => 8
*
* _.max([]);
* // => -Infinity
*
* var users = [
* { 'user': 'barney', 'age': 36 },
* { 'user': 'fred', 'age': 40 }
* ];
*
* _.max(users, function(chr) {
* return chr.age;
* });
* // => { 'user': 'fred', 'age': 40 };
*
* // using the `_.property` callback shorthand
* _.max(users, 'age');
* // => { 'user': 'fred', 'age': 40 };
*/
var max = createExtremum(arrayMax);
/**
* Gets the minimum value of `collection`. If `collection` is empty or falsey
* `Infinity` is returned. If an iteratee function is provided it is invoked
* for each value in `collection` to generate the criterion by which the value
* is ranked. The `iteratee` is bound to `thisArg` and invoked with three
* arguments; (value, index, collection).
*
* If a property name is provided for `predicate` 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 `predicate` the created `_.matches` style
* callback returns `true` for elements that have the properties of the given
* object, else `false`.
*
* @static
* @memberOf _
* @category Math
* @param {Array|Object|string} collection The collection to iterate over.
* @param {Function|Object|string} [iteratee] The function invoked per iteration.
* @param {*} [thisArg] The `this` binding of `iteratee`.
* @returns {*} Returns the minimum value.
* @example
*
* _.min([4, 2, 8, 6]);
* // => 2
*
* _.min([]);
* // => Infinity
*
* var users = [
* { 'user': 'barney', 'age': 36 },
* { 'user': 'fred', 'age': 40 }
* ];
*
* _.min(users, function(chr) {
* return chr.age;
* });
* // => { 'user': 'barney', 'age': 36 };
*
* // using the `_.property` callback shorthand
* _.min(users, 'age');
* // => { 'user': 'barney', 'age': 36 };
*/
var min = createExtremum(arrayMin, true);
/**
* Gets the sum of `collection` values.
*
* @static
* @memberOf _
* @category Math
* @param {Array|Object|string} collection The collection to iterate over.
* @returns {number} Returns the sum of values.
* @example
*
* _.sum([4, 6, 2]);
* // => 12
*
* _.sum({ 'a': 4, 'b': 6, 'c': 2 });
* // => 12
*/
function sum(array) {
var length = array ? array.length : 0,
function sum(collection) {
if (!isArray(collection)) {
collection = toIterable(collection);
}
var length = collection.length,
result = 0;
while (length--) {
result += array[length];
result += +collection[length] || 0;
}
return result;
}

20
test/test.js
View File

@@ -9648,7 +9648,7 @@
(function() {
test('should return the largest value from a collection', 1, function() {
strictEqual(3, _.max([1, 2, 3]));
strictEqual(_.max([1, 2, 3]), 3);
});
test('should return `-Infinity` for empty collections', 1, function() {
@@ -10067,7 +10067,7 @@
(function() {
test('should return the smallest value from a collection', 1, function() {
strictEqual(1, _.min([1, 2, 3]));
strictEqual(_.min([1, 2, 3]), 1);
});
test('should return `Infinity` for empty collections', 1, function() {
@@ -13340,7 +13340,7 @@
(function() {
test('should return the sum of an array of numbers', 1, function() {
equal(_.sum([6, 4, 2]), 12);
strictEqual(_.sum([6, 4, 2]), 12);
});
test('should return `0` when passing empty `array` values', 1, function() {
@@ -13352,6 +13352,20 @@
deepEqual(actual, expected);
});
test('should coerce values to numbers and `NaN` to `0`', 1, function() {
strictEqual(_.sum(['1', NaN, '2']), 3);
});
test('should iterate an object', 1, function() {
strictEqual(_.sum({ 'a': 1, 'b': 2, 'c': 3 }), 6);
});
test('should iterate a string', 2, function() {
_.each(['123', Object('123')], function(value) {
strictEqual(_.sum(value), 6);
});
});
}());
/*--------------------------------------------------------------------------*/