How to calculate the sum of elements in JS array

This article mainly shows you "JS array how to calculate the sum of elements", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn "JS array how to calculate the sum of elements" this article.

1. Use the forEach () method to call each element of the array and pass it to the callback function.

Syntax:

Array.forEach (funtion callbackfn (value, index, array), thisValue)

Output array element instance

Function f (value,index,array) {console.log ("a [" + index + "] =" + value);} var a = ['a', 'baked,' c']; a.forEach (f)

2. The reduce () method calls the specified callback function on all elements in the array.

The return value of the callback function is the cumulative result, and this return value is provided as a parameter the next time the callback function is called.

Syntax:

Array.reduce (previousValue, currentVaule, currentIndex, array), initialValue)

Accumulate and sum the array values

Var a = [11,12,13], sum= 0position function f (pre,curr) {sum=pre+curr; return sum;} a.reduce (f); console.log (sum); this is all the content of the article "how to calculate the sum of elements in JS arrays". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!