I have an array A:

const A = [
    [1, 2],
    [3, 4],
    [5, 6]
];

Is there a possibility to call map in a way that the sub arrays are expanded to named arguments of the lambda?

For instance, I want this:

const B = A.map((a, b) => a + b);

Instead of:

const B = A.map(e => e[0] + e[1]);

I have an array A:

const A = [
    [1, 2],
    [3, 4],
    [5, 6]
];

Is there a possibility to call map in a way that the sub arrays are expanded to named arguments of the lambda?

For instance, I want this:

const B = A.map((a, b) => a + b);

Instead of:

const B = A.map(e => e[0] + e[1]);

• javascript

• 1 No, there's no way to make map itself do that. But it would be relatively trivial to use a different callback function, or write a wrapper to map which does that, or write a wrapper for the callback function. – Bergi Commented Mar 19 at 0:38

1 Answer 1

Sounds like a job for array destructuring:

const A = [[1,2],[3,4],[5,6]];

const B = A.map(([a,b]) => a + b);
console.log(B)