[Javascript] Immutable opreators

最新推荐文章于 2025-08-14 17:31:00 发布

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最新推荐文章于 2025-08-14 17:31:00 发布

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文章标签： javascript ViewUI

本文介绍JavaScript中数组的基本操作，包括添加、删除、更新等常见需求的实现方式，并演示了如何使用现代JavaScript特性来简化这些任务。

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slice
filter
map
...spread
concat
Object.assign

let items = [1,2,3];

//add
let newItems = [...items, 30];

//remove
var filtered = newItems.filter( item => item !== 2);

//update
let things = [1,2,3,4,5].map(num => ({id: num}));
var i = things.findIndex(item => item.id === 3);
var updated = [
  ...things.slice(0, i),
  {id: 33},
  ...things.slice(i+1)
];


var state = {app: {}, items: [1]};

//add
var newState = Object.assign({}, state, {app: 2, newThings: 2});

// update
var newState = Object.assign({}, state, {app: 2});
var newState = {
  ...state,
  app: 2
};