How to use reduce to Sum es6

This article mainly introduces es6 how to use reduce summation related knowledge, the content is detailed and easy to understand, the operation is simple and fast, has a certain reference value, I believe that after reading this es6 how to use reduce summation article will have a harvest, let's take a look at it.

In es6, the reduce () method can traverse the array, let the front and back items of the array do some kind of calculation, then return its value, and continue the calculation without changing the original array, returning the final result of the calculation for summation. The syntax is "arr.reduce (function (a sum=a+b; b) {sum=a+b;});".

This tutorial operating environment: windows10 system, ECMAScript version 6. 0, Dell G3 computer.

How to use reduce summation in es6

Reduce can traverse the array, let the front and back items of the array do some calculation, then return its value, and continue the calculation without changing the original array, returning the final result of the calculation; if no initial value is given, the traversal starts with the second term of the array.

The reduce () method takes a function as an accumulator, and each value in the array (from left to right) starts to shrink and eventually evaluates to a value.

Arr.reduce (function (pmaec) {sum=p+c;})

Examples are as follows:

Var arr = [1, 2, 3], sum= 0 position arr.reduce (function (pre,curr) {sum=pre+curr;return sum;}); console.log (sum)

Output result:

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