reducers

简明释义

英[rɪˈdjuːsəz]美[rɪˈduːsərz]

n. 缩减者；[助剂]还原剂；异径接头（reducer 的复数）

英英释义

单词用法

同义词

反义词

例句

1.Results indicated that the average level of NNAL for reducers was more than twice that of light smokers, even when the two groups smoked about the same number of cigarettes per day.

结果显示，减少吸烟量的受试者NNAL平均值是轻度吸烟者的2倍多，尽管这两组受试者每天的吸烟量大致相同。

2.Reducers, brakes and other lifting devices.

减速器、制动器等起升装置。

3.The other damage reducers didn't feel like a big problem either way. It still ignores resistance and absorptions, which is technically all the tooltip said in the first place.

总之其他的伤害减免效果应该不会是什么大问题，它仍然能无视抵抗和吸收，这个实际上是它最开始的技能说明的所有内容。

4.The thrust ball bearings are used in lathe centers, automobile cluthes, reducers and so on.

它们主要适用于车床顶心、汽车离合器、减速机等。

5.The researchers created a mathematical formula to calculate the degree of smoking compensation in reducers compared with light smokers.

研究人员建立了一种数学公式，以计算吸烟量减少的重度吸烟者相对于轻度吸烟者的吸烟代偿程度。

6.The first productions, made on specific requests, we moved to the design and construction of the reducers series.

第一次制作，就具体的要求，我们搬到了减速器系列的设计和施工。

7.These systems can also be used in tests of large motor couplings, speed reducers, clutches, etc.

这些系统还可以用于大马达联轴节、减速器、离合器等的试验。

8.When managing complex state in React applications, using reducers can help keep your code organized.

在React应用程序中管理复杂状态时，使用reducers可以帮助保持代码的组织性。

9.Each reducer should handle a specific part of the state to maintain clarity and separation of concerns.

每个reducer应该处理状态的特定部分，以保持清晰性和关注点的分离。

10.You can combine multiple reducers into one using the combineReducers utility from Redux.

您可以使用Redux中的combineReducers工具将多个reducers组合成一个。

11.In the context of Redux, reducers are pure functions that take the previous state and an action to return the next state.

在Redux的上下文中，reducers是纯函数，它们接受先前的状态和一个动作，以返回下一个状态。

12.Testing reducers is straightforward since they are pure functions without side effects.

测试reducers是简单的，因为它们是没有副作用的纯函数。

作文

In the world of programming, particularly in the context of state management in applications, the term reducers (简化器) plays a crucial role. A reducer is a function that takes the previous state and an action as its arguments and returns a new state. This concept is most commonly associated with libraries such as Redux, which is widely used in JavaScript applications for managing application state in a predictable way.Understanding how reducers work is essential for any developer who wants to build scalable and maintainable applications. The core idea behind a reducer is to ensure that state changes are handled in a pure manner. This means that given the same inputs, a reducer will always produce the same output without causing any side effects. This predictability makes it easier to track changes in the application state and debug issues when they arise.For instance, consider a simple counter application where the state consists of a single number representing the count. The actions could be 'INCREMENT' or 'DECREMENT'. The reducer function would look something like this:function counterReducer(state = 0, action) { switch (action.type) { case 'INCREMENT': return state + 1; case 'DECREMENT': return state - 1; default: return state; }}In this example, the reducer takes the current state (which defaults to 0 if not provided) and an action object. Based on the type of action, it either increments or decrements the state. If the action type does not match any cases, it simply returns the current state. This demonstrates the pure function nature of reducers.One of the advantages of using reducers is that they allow for easy composition. You can combine multiple reducers into a single reducer using a utility function such as `combineReducers`. This is particularly useful in larger applications where different parts of the state are managed by different reducers. For example, you might have one reducer for user authentication state and another for managing product listings in an e-commerce application.Another important aspect of reducers is their role in implementing the concept of immutability. When a reducer returns a new state, it should not modify the existing state directly. Instead, it creates a new copy of the state with the necessary changes. This practice helps prevent unintended side effects and keeps the application state predictable.In conclusion, reducers (简化器) are fundamental to managing state in modern web applications. They provide a structured way to handle state changes, ensuring that the application remains predictable and easy to debug. By adhering to the principles of pure functions and immutability, developers can create robust applications that are easier to maintain and scale over time. As the complexity of applications grows, understanding and effectively utilizing reducers becomes increasingly important for successful software development.