How to sum two arrays in ES6

Summing method: 1. Use concat() to merge two arrays. The syntax "array1.concat(array2)" will add the elements of array 2 to the end of array 1; 2. Use reduce () Calculate the sum of merged arrays, the syntax is "array.reduce(function(p,c){sum=p c;})".

The operating environment of this tutorial: Windows 7 system, ECMAScript version 6, Dell G3 computer.

How to sum two arrays in ES6

1. Use concat() to merge two arrays into one array

The concat() method can connect two or more arrays and will add the elements of one or more arrays as parameters to the end of the specified array

var a = [1,2,3];
var b = [4,5,6];
console.log(a);
console.log(b);
var d = a.concat(b);
console.log(d);

2. Use reduce() to calculate the sum of all elements in the merged array

reduce can traverse the array, let the two items before and after the array perform some calculation, and then return Its value, and continue the calculation without changing the original array, return the final result of the calculation; if no initial value is given, the traversal starts from the second item of the array.

The reduce() method receives a function as an accumulator, and each value in the array (from left to right) starts to be reduced and finally calculated to a value.

Summing example:

var a = [1,2,3];
var b = [4,5,6];
console.log(a);
console.log(b);
var d = a.concat(b);
var sum = 0;
d.reduce(function(pre,curr) {
sum=pre+curr;
return sum;
});
console.log(sum);

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