I was just tweaking some code in JS and ended up writing the below code.
const adding=(a,b,c,d)=> {
return(a+b, c+d)
}
let sum1, sum2 = adding(1,2,3,4)
console.log(sum1)
console.log(sum2)
The output was Undefined 7
And when I changed the position of return values like below
const adding=(a,b,c,d)=> {
return(c+d, a+b)
}
let sum1, sum2 = adding(1,2,3,4)
console.log(sum1)
console.log(sum2)
The out put was Undefined 3
My question is Why?
Your approach returns only the last expression, because of the comma operator and parentheses is not a valid data type, just a grouping operator ().
Instead you could take an array as data structure with further destructuring.
const adding = (a, b, c, d) => [c + d, a + b];
let [sum1, sum2] = adding(1, 2, 3, 4);
console.log(sum1)
console.log(sum2)
In javascript, you can declare multiple variables on a single line separated with comma. Therefore you declared sum1 and sum2. However, you assigned value to only sum2
What you did is same as
let sum1;
let sum2 = add(1, 2, 3, 4);
