const s = new Set(); // 创建时赋值 const colors = new Set(['red',white,'blue']); 1. 2. 3. 4. 5. 也可传入数组创建set,但若数组内存在相同元素,则会去重! let list = [1, 2, 3, 3]; let my_set = new Set(list); console.log(my_set); // 打印 Set(3) { 1, 2, 3 }...
解决方法: 可以使用Set来去除数组中的重复元素,然后再将Set转换回数组。 代码语言:txt 复制 let arrayWithDuplicates = [1, 2, 2, 3, 4, 4, 5]; let uniqueArray = [...new Set(arrayWithDuplicates)]; // [1, 2, 3, 4, 5] 在这个例子中,Set自动去除了重复的元素,然后使用扩展运算符...将Set...
今天做一个算法题,发现用arr.includes()查询超时,而改为set.has()查询就能通过,想弄明白Set,Map,Array查询的速度差别代码let len=10000 let arr=new Array(len).fill(0) let set=new Set(arr) let map=new Map() for(let i=0;i<len;i++){ arr[i]=i map.set(i,arr[i]) } // 比较时间 co...
1.set集合转化Array数组 注意:这个可以使用过滤数组中的重复的元素 你可以先把数组转化为set集合 然后在把这个集合通过Array.from这个方法把集合在转化为数组 var set = new Set([1, 2, 3, 3, 4]); Array.from(set) //输出[1,2,3,4] 2.字符串通过Array.from 会被分割成单个字符的数组 Array.from('...
NODE\_SET\_METHOD(exports, "hello", Method); } NODE\_MODULE(addon, init) } // namespace demo c)package.json(包含模块的一些信息) main很重要,标识了模块的路径,路径错了,就加载不了 代码语言:txt AI代码解释 { "name": "hellpworld", ...
-Set:1.add()// 添加一个元素,支持链式操作 add('nihao') // 返回set2.delete()// 删除 delete('nihao') // true3.has()// 判断是否存在 has('nihao') // false4.可以通过Set里的值不会重复的特性进行两个数组合并去重等操作leta=newSet([1,2,3]);letb=newSet([4,3,2]);Array.from(new...
Note that in the default configuration, without setting runScripts, the values of window.Array, window.eval, etc. will be the same as those provided by the outer Node.js environment. That is, window.eval === eval will hold, so window.eval will not run scripts in a useful way. We str...
extensions: an array of file extensions, excluding the dot, with the preferred extension first, e.g. ["bmp", "dib"] defaultFileName (optional): a suggested file name, e.g. "Untitled.png" or the name of an open document. defaultPath (optional): a file handle for a document that was...
Finally, you can set the default argument: function http(endpoint, method='GET') { console.log(method) ... } http('/api') // GET Tired of messing with the unwieldy arguments object? With the new specification, you can get the rest of the arguments as an array: function network...
varurl ="http://oss.sheetjs.com/test_files/formula_stress_test.xlsx";/* set up async GET request */varreq =newXMLHttpRequest(); req.open("GET", url,true); req.responseType ="arraybuffer"; req.onload =function(e){vardata =newUint8Array(req.response);varworkbook = XLSX.read(data,...