Logical OR of arrays in javascript

Question

I would like to perform a logical OR operation on arrays in javascript, so that performing this operation on arrays a and b

let a = [0,1,0]
let b = [0,0,5]

gives me

OR(a, b)
[0,1,5]

What would be an efficient and idiomatic way to implement OR?

Nina Scholz · Accepted Answer · 2019-06-06 08:40:33Z

3

You could reduce the wanted arrays by taking a mapping and an or function.

const or = (a, b) => a || b,
      mapped = fn => (a, b) => a.map((v, i) => fn(v, b[i]));

var a = [0, 1, 0],
    b = [0, 0, 5],
    c = [a, b].reduce(mapped(or));

console.log(c);

edited Jun 6, 2019 at 8:40

answered Mar 29, 2019 at 7:47

Nina Scholz

388k26 gold badges367 silver badges417 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Mihai Alexandru-Ionut · Accepted Answer · 2019-03-29 07:48:33Z

2

Just use || operator in combination with map method by passing a callback function as argument.

let a = [0,1,0]
let b = [0,0,5]

let c = a.map((item, index) => item || b[index]);
console.log(c);

edited Mar 29, 2019 at 7:48

answered Mar 29, 2019 at 7:43

Mihai Alexandru-Ionut

48.6k14 gold badges106 silver badges132 bronze badges

Comments

CertainPerformance · Accepted Answer · 2019-03-29 07:42:34Z

1

Assuming the arrays always have the same length, use .map and ||:

const OR = (a, b) => a.map((aItem, i) => aItem || b[i]);
let a = [0,1,0]
let b = [0,0,5]
console.log(
  OR(a, b)
);

answered Mar 29, 2019 at 7:42

CertainPerformance

373k55 gold badges354 silver badges359 bronze badges

Collectives™ on Stack Overflow

Logical OR of arrays in javascript

3 Answers 3

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related