Date

“Function” Methods

_.memoize(func, [resolver])

source npm package

Creates a function that memoizes the result of func. If resolver is provided, it determines the cache key for storing the result based on the arguments provided to the memoized function. By default, the first argument provided to the memoized function is used as the map cache key. The func is invoked with the this binding of the memoized function.

Note: The cache is exposed as the cache property on the memoized function. Its creation may be customized by replacing the _.memoize.Cache constructor with one whose instances implement the Map method interface of clear, delete, get, has, and set.

引入版本

0.1.0

参数
func (Function) : The function to have its output memoized.
[resolver] (Function) : The function to resolve the cache key.

返回值
(Function) : Returns the new memoized function.

示例
var object = { 'a'1, 'b'2 };
var other = { 'c'3, 'd'4 };
 
var values = _.memoize(_.values);
values(object);
// => [1, 2]
 
values(other);
// => [3, 4]
 
object.a = 2;
values(object);
// => [1, 2]
 
// Modify the result cache.
values.cache.set(object, ['a', 'b']);
values(object);
// => ['a', 'b']
 
// Replace `_.memoize.Cache`.
_.memoize.Cache = WeakMap;