In this tutorial, we’ll explore various methods to achieve this, from traditional loops to modern array methods. By the end, you’ll have a solid understanding of how to sum an array in JavaScript, equipping you with the skills needed for your next coding project. Let’s dive in!
In javascript, we can calculate the sum of the elements of the array by using the Array.prototype.reduce() method. The reduced method for arrays in javascript helps us specify a function called reducer function that gets called for each of the elements of an array for which we are calling ...
const sum = [0, 1, 2, 3, 4].reduce((acc, curr) => acc + curr) const sum1 = [0, 1, 2, 3, 4].reduceRight((acc, curr) => acc + curr) console.log(sum) // 10 console.log(sum1) // 10 总结 至此我们已经将数组中所有的属性和方法都总结了一遍,并且给出了最基本的用法示例。
log(sum); array.every( fn ) : 检测数值元素的每个元素是否都符合条件。布尔值。如果所有元素都通过检测返回 true,否则返回 false。原始值不变。 不会对空数组进行检测。 如果数组中检测到有一个元素不满足,则整个表达式返回 false ,且剩余的元素不会再进行检测。如果所有元素都满足条件,则返回 true。 fn( ...
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...
Array.prototype.sum=function(){returnthis.reduce(function(partial,value){returnpartial+value},0)};[3,4,5,6,10].sum()// <- 28 9.slice() slice()方法用于提取目标数组的一部分,返回一个新数组,原数组不变。 arr.slice(start,end) 它的第一个参数为起始位置(从0开始,会包括在返回的新数组之中...
let sum = arr.reduce((pre, cur, index, array) => { return pre + cur }) console.log(sum) // 15 1. 2. 3. 4. 5. a[n] = 1 通过长度控制 数组的length(长度)并不是只读属性,可以通过更改长度值更改数组项。 let a = [1, 2, 3, 4] ...
In this article we will see how to find a pair of items in an array which has sum equals to a specific target number. So we will use JavaScript to implement the algorithm. Understanding the Problem The problem at hand is to find the pair of numbers in the array whose sum is equal...
代码语言:javascript 代码运行次数:0 运行 AI代码解释 package main import "fmt" func main() { a := [...]float64{67.7, 89.8, 21, 78} sum := float64(0) for i, v := range a {//range returns both the index and value fmt.Printf("%d the element of a is %.2f\n", i, v) sum...
log(`arr's sum: ${sum}`); 这样一来就过滤掉了 's' 元素,仅仅只有作为数值的前两个数组元素参与了求和。这样就确保了将数组中的有效数值求和最终得到一个数值而不是一个其他类型的值。 -2). 数组也是对象。所以为数组定义什么属性或者方法都是可以的。 var arr = [1, 2, 3]; arr.name = 'LJ'...