How to add multidimensional array values in javascript?

Question

I am pretty new to javascript.I am confused with javascript reduce. this is my array value

var result = [ 
 [ 0, 4, 22 ]//26,
 [ 0, 9, 19 ]//28 
 ]

I want to add this array value like this..

 [
 [26],
 [28]
 ]

And again I have to add this value like this..

26+28=54

this is my try this gives me undefined..

var sum = result.map((data) => {
 data.reduce(function (total ,curr) {
 return total+curr
 })
});
console.log(sum)

Answer 1

You need a return statement in block statements

var sum = result.map(data => {
 return data.reduce(function (total, curr) {
// ^^^^^^
 return total + curr;
 });
});

or without block statement

var sum = result.map(data => data.reduce((total, curr) => total + curr));

To answer the last part question, I suggest to create a function for adding values and use it as callback for Array#reduce.

var add = (a, b) => a + b,
 result = [[0, 4, 22], [0, 9, 19]],
 sum = result.map(a => a.reduce(add)),
 total = sum.reduce(add);
console.log(sum);
console.log(total);

.as-console-wrapper { max-height: 100% !important; top: 0; }

• Pointy: In an arrow function with a single expression, there's an implicit return.