function uniqueArray(arr){ return [...new Set(arr)] } 这个方法是最简单的，他是利用set ...
We can get the unique values from an array using the Set(), indexOf() and filter() functions in JavaScript.
目前所有 modern browser 都支持了这个功能。 如果想兼容 IOS 17.4 以下,可以使用core-js polyfill。 参考 ECMAScript 2023将新增的九个数组方法 Stack Overflow – Most efficient method to groupby on an array of objects(用 reduce 实现的 group by, 也是最 popular 的方案) Setup Polyfill 我需要兼容 IOS,...
constarray=[['key1','value1'],['key2','value2']]//或者constmap=newMap([['key1','value1'],['key2','value2']])//这个方法好用!functiontoObject(pairs){returnArray.from(pairs).reduce((acc,[key,value])=>Object.assign(acc,{[key]:value}),{})}toObject(array)// { key1: 'va...
[Tips + Javascript] Make a unique array To make an array uniqued, we can use Set() from Javascript. const ary = ["a", "b", "c", "a", "d", "c"]; console.log(newSet(ary)); We can see that all the duplicated value have been removed, now the only thing we need to do ...
UniqueValuesResult An object that contains the unique values returned from the uniqueValues() query of a layer's field. Properties uniqueValueInfos Object[] An array of objects, each containing a unique value/type/category present in the field specified in the uniqueValues() query. ...
constarr=[1,2,3];console.log(typeofarr);// objectconsole.log(Array.isArray(arr));// true 5.从阵列中删除重复项 constarray=[1,1,2,3,5,5,1];constuniqueArray=[...newSet(array)];console.log(uniqueArray);// [1, 2, 3, 5] ...
To provide a unique, bottom and top offset just provide an object offset: { top: 10 } or offset: { top: 10, bottom: 5 }. Use a function when you need to dynamically calculate an offset. target selector | node | jQuery element the window object Specifies the target element of the ...
4.2 Use Array#push instead of direct assignment to add items to an array. const someStack = []; // bad someStack[someStack.length] = 'abracadabra'; // good someStack.push('abracadabra');4.3 Use array spreads ... to copy arrays. // bad const len = items.length; const itemsCopy =...
Array.form() Set组合 constarr=[ 1,2,3,6,3,5,5]functionArrayfromSet(arr){if(Array.isArray(arr)){returnArray.from(newSet(arr))}}ArrayfromSet(arr)//(5) [1, 2, 3, 6, 5] indexOf方式 Array.prototype.unique=function(){vararr=[];...