MDN 的 JavaScript 文档 reduce() 方法的基本语法 reduce方法的基本语法如下: array.reduce(callback, initialValue) 或 array.reduce(function(total, currentValue, currentIndex, arr), initialValue) 其中,array是要进行操作的数组,callback
const objectsArray = [{ id: 1 }, { id: 2 }, { id: 1 }]; const uniqueObjectsArray = objectsArray.reduce((accumulator, currentObject) => { if (!accumulator.find(obj => obj.id === currentObject.id)) { accumulator.push(currentObject); } return accumulator; }, []); console.log(...
functiongetMissingElement(superImportantArray){ returnsuperImportantArray.reduce(function(sum,i){returnsum - i;},45) } 2.Write a function that flattens an Array of Array objects into a flat Array. Your function must only do one level of flattening. Exmaple: flatten([123]) // => [1,2,...
let uniqueArray = [...new Set(array)]; 三、查重复杂数据类型 对于含有复杂数据(如对象)的数组,查重过程会稍微复杂一点。比较对象的唯一性时,我们不能直接使用indexOf或includes,因为这些方法对于非基本数据类型只能比较引用地址。 一个常见的方法是使用JSON字符串化比较对象: let uniqueObjects = objectsArray.r...
代码语言:javascript 代码运行次数:0 运行 AI代码解释 // friends - an array of objects // where object field "books" - list of favorite books var friends = [ { name: "Anna", books: ["Bible", "Harry Potter"], age: 21, }, { name: "Bob", books: ["War and peace", "Romeo and ...
Javascript reduce on array of objects 在我的例子中,"type“是"PV","BHKW","FALLBACK”的ENUM,但它可以扩展。除了编写声明性for in循环之外,我不知道如何使用array.reduce更优雅地实现这一点。 有什么建议吗? 代码语言:javascript 运行 AI代码解释 { "2018-08-01T11:00:00+02:00": [ { "BHKW": {...
Reduce an array of objects to a sum of a given property Group an array of objects by key or a set of given criteria Count the number of objects in an array by key or a given set of criteria let numbers = [1,2,3,4,5];
Reduce an array of objects to a sum of a given property Group an array of objects by key or a set of given criteria Count the number of objects in an array by key or a given set of criteria let numbers = [1,2,3,4,5];
④……⑤ 将需要去重处理的数组中的第n项在初始化数组中查找,如果找不到,就将该项继续添加到初始化数组中⑥ 将这个初始化数组返回 参考文章: https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce https://www.jianshu.com/p/541b84c9df90...
// friends - an array of objects // where object field "books" is a list of favorite books let friends = [{ name: 'Anna', books: ['Bible', 'Harry Potter'], age: 21 }, { name: 'Bob', books: ['War and peace', 'Romeo and Juliet'], ...