最后,我们通过Object.values()方法将散列的值(分组后的对象)转换为数组,并返回结果。 至于JavaScript中散列的Group by和sum数组的应用场景,一个常见的例子是对数据进行统计和分析。通过将数据按照某个属性进行分组,并对其他属性进行求和、计数、平均值等操作,可以快速得到一些数据汇总的结果,以支持决策和业务需求。
function arraySum(arr) { var sum = 0; if (Object.prototype.toString.call(arr) === '[object Array]') { for (var i = 0; i < arr.length; i++) { if (typeof arr[i] === "number" && !isNaN(arr[i])) { sum += arr[i]; } else { va...
分析下面的 JavaScript代码段a=new Array(2,3,4,5,6);sum=0;for(i=1;isum +=a[i];}document.write(sum);A. 20B. 18C. 14D. 12 相关知识点: 试题来源: 解析 B 数组a是[2,3,4,5,6],索引从0开始。循环从i=1开始,到i=4结束(i < a.length,即i <5)。遍历的元素为a[1]=3,a[2...
varmyArray=[0,1,2,3,4,5,6,7,8,9,10];varsum=myArray.reduce(function(previous,current){re...
20.分析下面的JavaScript代码段:a=new Array(1, 3,5.7,9);sum=0:for(i=1; ia.length; i++){sum +=a[i]: }document. write(sum);输出结果是 A.25 B.24 C.21 D.15 相关知识点: 试题来源: 解析 【答案】 B 【解析】 本题的结果是 a[1]+a[2]+a[3]+a[4]=3+5+7+9=24 【难度...
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In programming,sumtypically represents an operation where multiple values are combined together to form a single value, usually through addition. For example, in an array of numbers, invoking a sum function would return the total of all the numbers within that array. This operation is fundamental...
Array GenericCollection Usage sum() sum(zero) Related average() Returns the arithmetic mean of the collection, by computing its sum and the count of values and returning the quotient. reduce(callback, basis) Aggregates every value in this collection with the result collected up to that...
Learn how to add or sum an array of objects using JavaScript and its custom method. and use tryit customizing this code to make it suit your preferences