--- highlight: atom-one-dark theme: orange --- # 面试复习篇1：数据结构与算法篇（上） # 数据结构 ```js |-对象 |-数组 |-栈 |-队列 |-链表 |-字典 |-集合 |-树 ``` ## 对象 ```js const obj = { name: 'ljx', age: 28 } // assign 赋值操作 const assignObj = Object.assign({}, obj, { position: 'FE' }) console.log(assignObj) // { name: "ljx", age: 28, position: "FE" } // 获取键值对 const entries = Object.entries(assignObj) console.log(entries) // [["name","ljx"],["age",28],["position","FE"]] // 获取所有key const keys = Object.keys(assignObj) // ["name","age","position"] // 获取所有value const values = Object.values(assignObj) // ["ljx", 28, "FE"] // 判断是否是某个class的实例 const is = Object.is(entries, obj) console.log(is) //false // 属性描述符 const defineObj: Record = Object.defineProperty(assignObj, 'gender', { writable: false, value: 'male' }) // { name: "ljx", age: 28, position: "FE", gender: 'male } console.log(Object.is(defineObj, assignObj)) // true console.log(defineObj === assignObj) // true // 冻结操作 Object.freeze(defineObj) defineObj.age = 18 // TypeError: Cannot assign to read only property 'age' of object '#