How to realize the summation of arrays by javascript

This article mainly explains "how to realize the summation of arrays by javascript". Friends who are interested may wish to have a look. The method introduced in this paper is simple, fast and practical. Now let the editor take you to learn "javascript how to achieve the summation of arrays"!

Methods: 1, use "a.forEach (function (value) {sum+=value})" statement; 2, use "a.reduce (function (pre,curr) {sum=pre+curr})"; 3, use "eval (a.join (" + "))".

The operating environment of this tutorial: windows7 system, javascript1.8.5 version, Dell G3 computer.

Javascript summation of arrays

Method 1: use the forEach () method

The forEach () method invokes each element of the array and passes the element to the callback function.

Example: accumulate array values

Var a = [10,11,12], sum = 0boma.forEach (function (value) {sum + = value;}); console.log (sum)

Output result:

Method 2: use the reduce () method

Var a = [11,12,13], sum= 0. Reduce (function (pre,curr) {sum=pre+curr; return sum;}); console.log (sum)

Method 3: use the eval () method

Var a = [12, 13, 14], sum= 0 (a.join ("+")); console.log (sum)

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